ccminer-gostd-lite/ccminer.cpp

/*
 * Copyright 2010 Jeff Garzik
 * Copyright 2012-2014 pooler
 * Copyright 2014-2015 tpruvot
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.  See COPYING for more details.
 */

#include <ccminer-config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <inttypes.h>
#include <unistd.h>
#include <math.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>

#include <curl/curl.h>
#include <openssl/sha.h>

#ifdef WIN32
#include <windows.h>
#include <stdint.h>
#else
#include <errno.h>
#include <sys/resource.h>
#if HAVE_SYS_SYSCTL_H
#include <sys/types.h>
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/sysctl.h>
#endif
#endif

#include "miner.h"
#include "algos.h"
#include <cuda_runtime.h>


#ifdef WIN32
#include <Mmsystem.h>
#pragma comment(lib, "winmm.lib")
#include "compat/winansi.h"
BOOL WINAPI ConsoleHandler(DWORD);
#endif

#define PROGRAM_NAME		"ccminer"
#define LP_SCANTIME		60
#define HEAVYCOIN_BLKHDR_SZ		84
#define MNR_BLKHDR_SZ 80

#include "nvml.h"
#ifdef USE_WRAPNVML
nvml_handle *hnvml = NULL;
#endif

enum workio_commands {
	WC_GET_WORK,
	WC_SUBMIT_WORK,
	WC_ABORT,
};

struct workio_cmd {
	enum workio_commands	cmd;
	struct thr_info		*thr;
	union {
		struct work	*work;
	} u;
	int pooln;
};

bool opt_debug = false;
bool opt_debug_diff = false;
bool opt_debug_threads = false;
bool opt_protocol = false;
bool opt_benchmark = false;
bool opt_showdiff = false;

// todo: limit use of these flags,
// prefer the pools[] attributes
bool want_longpoll = true;
bool have_longpoll = false;
bool want_stratum = true;
bool have_stratum = false;
bool allow_gbt = true;
bool allow_mininginfo = true;
bool check_dups = false;
bool check_stratum_jobs = false;

static bool submit_old = false;
bool use_syslog = false;
bool use_colors = true;
int use_pok = 0;
static bool opt_background = false;
bool opt_quiet = false;
static int opt_retries = -1;
static int opt_fail_pause = 30;
int opt_time_limit = -1;
int opt_shares_limit = -1;
time_t firstwork_time = 0;
int opt_timeout = 300; // curl
int opt_scantime = 10;
static json_t *opt_config;
static const bool opt_time = true;
volatile enum sha_algos opt_algo = ALGO_AUTO;
int opt_n_threads = 0;
int gpu_threads = 1;
int64_t opt_affinity = -1L;
int opt_priority = 0;
static double opt_difficulty = 1.;
bool opt_extranonce = true;
bool opt_trust_pool = false;
uint16_t opt_vote = 9999;
int num_cpus;
int active_gpus;
char * device_name[MAX_GPUS];
short device_map[MAX_GPUS] = { 0 };
long  device_sm[MAX_GPUS] = { 0 };
uint32_t gpus_intensity[MAX_GPUS] = { 0 };
uint32_t device_gpu_clocks[MAX_GPUS] = { 0 };
uint32_t device_mem_clocks[MAX_GPUS] = { 0 };
uint32_t device_plimit[MAX_GPUS] = { 0 };
uint8_t device_tlimit[MAX_GPUS] = { 0 };
int8_t device_pstate[MAX_GPUS] = { -1, -1 };
int32_t device_led[MAX_GPUS] = { -1, -1 };
int opt_led_mode = 0;
int opt_cudaschedule = -1;
static bool opt_keep_clocks = false;

// un-linked to cmdline scrypt options (useless)
int device_batchsize[MAX_GPUS] = { 0 };
int device_texturecache[MAX_GPUS] = { 0 };
int device_singlememory[MAX_GPUS] = { 0 };
// implemented scrypt options
int parallel = 2; // All should be made on GPU
char *device_config[MAX_GPUS] = { 0 };
int device_backoff[MAX_GPUS] = { 0 };
int device_lookup_gap[MAX_GPUS] = { 0 };
int device_interactive[MAX_GPUS] = { 0 };
int opt_nfactor = 0;
bool opt_autotune = true;
char *jane_params = NULL;

// pools (failover/getwork infos)
struct pool_infos pools[MAX_POOLS] = { 0 };
int num_pools = 1;
volatile int cur_pooln = 0;
bool opt_pool_failover = true;
volatile bool pool_on_hold = false;
volatile bool pool_is_switching = false;
volatile int pool_switch_count = 0;
bool conditional_pool_rotate = false;

// current connection
char *rpc_user = NULL;
char *rpc_pass;
char *rpc_url;
char *short_url = NULL;

struct stratum_ctx stratum = { 0 };
pthread_mutex_t stratum_sock_lock;
pthread_mutex_t stratum_work_lock;

char *opt_cert;
char *opt_proxy;
long opt_proxy_type;
struct thr_info *thr_info = NULL;
static int work_thr_id;
struct thr_api *thr_api;
int longpoll_thr_id = -1;
int stratum_thr_id = -1;
int api_thr_id = -1;
bool stratum_need_reset = false;
volatile bool abort_flag = false;
struct work_restart *work_restart = NULL;
static int app_exit_code = EXIT_CODE_OK;

pthread_mutex_t applog_lock;
pthread_mutex_t stats_lock;
double thr_hashrates[MAX_GPUS] = { 0 };
uint64_t global_hashrate = 0;
double   stratum_diff = 0.0;
double   net_diff = 0;
uint64_t net_hashrate = 0;
uint64_t net_blocks = 0;
// conditional mining
uint8_t conditional_state[MAX_GPUS] = { 0 };
double opt_max_temp = 0.0;
double opt_max_diff = -1.;
double opt_max_rate = -1.;
double opt_resume_temp = 0.;
double opt_resume_diff = 0.;
double opt_resume_rate = -1.;

int opt_statsavg = 30;

// strdup on char* to allow a common free() if used
static char* opt_syslog_pfx = strdup(PROGRAM_NAME);
char *opt_api_allow = strdup("127.0.0.1"); /* 0.0.0.0 for all ips */
int opt_api_remote = 0;
int opt_api_listen = 4068; /* 0 to disable */

bool opt_stratum_stats = false;

static char const usage[] = "\
Usage: " PROGRAM_NAME " [OPTIONS]\n\
Options:\n\
  -a, --algo=ALGO       specify the hash algorithm to use\n\
			blake       Blake 256 (SFR)\n\
			blake2s     Blake2-S 256 (NEVA)\n\
			blakecoin   Fast Blake 256 (8 rounds)\n\
			bmw         BMW 256\n\
			c11/flax    X11 variant\n\
			decred      Decred Blake256\n\
			deep        Deepcoin\n\
			dmd-gr      Diamond-Groestl\n\
			fresh       Freshcoin (shavite 80)\n\
			fugue256    Fuguecoin\n\
			groestl     Groestlcoin\n\
			heavy       Heavycoin\n\
			jackpot     Jackpot\n\
			keccak      Keccak-256 (Maxcoin)\n\
			lbry        LBRY Credits (Sha/Ripemd)\n\
			luffa       Joincoin\n\
			lyra2       CryptoCoin\n\
			lyra2v2     VertCoin\n\
			mjollnir    Mjollnircoin\n\
			myr-gr      Myriad-Groestl\n\
			neoscrypt   FeatherCoin, Phoenix, UFO...\n\
			nist5       NIST5 (TalkCoin)\n\
			penta       Pentablake hash (5x Blake 512)\n\
			quark       Quark\n\
			qubit       Qubit\n\
			sib         Sibcoin (X11+Streebog)\n\
			scrypt      Scrypt\n\
			scrypt-jane Scrypt-jane Chacha\n\
			skein       Skein SHA2 (Skeincoin)\n\
			skein2      Double Skein (Woodcoin)\n\
			s3          S3 (1Coin)\n\
			veltor      Thorsriddle streebog\n\
			x11evo      Permuted x11 (Revolver)\n\
			x11         X11 (DarkCoin)\n\
			x13         X13 (MaruCoin)\n\
			x14         X14\n\
			x15         X15\n\
			x17         X17\n\
			vanilla     Blake256-8 (VNL)\n\
			whirlcoin   Old Whirlcoin (Whirlpool algo)\n\
			whirlpool   Whirlpool algo\n\
			zr5         ZR5 (ZiftrCoin)\n\
  -d, --devices         Comma separated list of CUDA devices to use.\n\
                        Device IDs start counting from 0! Alternatively takes\n\
                        string names of your cards like gtx780ti or gt640#2\n\
                        (matching 2nd gt640 in the PC)\n\
  -i  --intensity=N[,N] GPU intensity 8.0-25.0 (default: auto) \n\
                        Decimals are allowed for fine tuning \n\
      --cuda-schedule   Set device threads scheduling mode (default: auto)\n\
  -f, --diff-factor     Divide difficulty by this factor (default 1.0) \n\
  -m, --diff-multiplier Multiply difficulty by this value (default 1.0) \n\
      --vote=VOTE       vote (for decred and HeavyCoin)\n\
      --trust-pool      trust the max block reward vote (maxvote) sent by the pool\n\
  -o, --url=URL         URL of mining server\n\
  -O, --userpass=U:P    username:password pair for mining server\n\
  -u, --user=USERNAME   username for mining server\n\
  -p, --pass=PASSWORD   password for mining server\n\
      --cert=FILE       certificate for mining server using SSL\n\
  -x, --proxy=[PROTOCOL://]HOST[:PORT]  connect through a proxy\n\
  -t, --threads=N       number of miner threads (default: number of nVidia GPUs)\n\
  -r, --retries=N       number of times to retry if a network call fails\n\
                          (default: retry indefinitely)\n\
  -R, --retry-pause=N   time to pause between retries, in seconds (default: 30)\n\
      --shares-limit    maximum shares [s] to mine before exiting the program.\n\
      --time-limit      maximum time [s] to mine before exiting the program.\n\
  -T, --timeout=N       network timeout, in seconds (default: 300)\n\
  -s, --scantime=N      upper bound on time spent scanning current work when\n\
                          long polling is unavailable, in seconds (default: 10)\n\
  -n, --ndevs           list cuda devices\n\
  -N, --statsavg        number of samples used to compute hashrate (default: 30)\n\
      --no-gbt          disable getblocktemplate support (height check in solo)\n\
      --no-longpoll     disable X-Long-Polling support\n\
      --no-stratum      disable X-Stratum support\n\
      --no-extranonce   disable extranonce subscribe on stratum\n\
  -q, --quiet           disable per-thread hashmeter output\n\
      --no-color        disable colored output\n\
  -D, --debug           enable debug output\n\
  -P, --protocol-dump   verbose dump of protocol-level activities\n\
      --cpu-affinity    set process affinity to cpu core(s), mask 0x3 for cores 0 and 1\n\
      --cpu-priority    set process priority (default: 3) 0 idle, 2 normal to 5 highest\n\
  -b, --api-bind=port   IP:port for the miner API (default: 127.0.0.1:4068), 0 disabled\n\
      --api-remote      Allow remote control, like pool switching\n\
      --max-temp=N      Only mine if gpu temp is less than specified value\n\
      --max-rate=N[KMG] Only mine if net hashrate is less than specified value\n\
      --max-diff=N      Only mine if net difficulty is less than specified value\n\
                        Can be tuned with --resume-diff=N to set a resume value\n"
#if defined(__linux) || defined(_WIN64) /* via nvml */
"\
      --mem-clock=3505  Set the gpu memory max clock (346.72+ driver)\n\
      --gpu-clock=1150  Set the gpu engine max clock (346.72+ driver)\n\
      --pstate=0[,2]    Set the gpu power state (352.21+ driver)\n\
      --plimit=100W     Set the gpu power limit (352.21+ driver)\n"
#else /* via nvapi.dll */
"\
      --mem-clock=3505  Set the gpu memory boost clock\n\
      --gpu-clock=1150  Set the gpu engine boost clock\n\
      --plimit=100      Set the gpu power limit in percentage\n\
      --tlimit=80       Set the gpu thermal limit in degrees\n\
      --led=100         Set the logo led level (0=disable, 0xFF00FF for RVB)\n"
#endif
#ifdef HAVE_SYSLOG_H
"\
  -S, --syslog          use system log for output messages\n\
      --syslog-prefix=... allow to change syslog tool name\n"
#endif
"\
      --show-diff       display submitted block and net difficulty\n\
  -B, --background      run the miner in the background\n\
      --benchmark       run in offline benchmark mode\n\
      --cputest         debug hashes from cpu algorithms\n\
  -c, --config=FILE     load a JSON-format configuration file\n\
  -V, --version         display version information and exit\n\
  -h, --help            display this help text and exit\n\
";

static char const short_options[] =
#ifdef HAVE_SYSLOG_H
	"S"
#endif
	"a:Bc:i:Dhp:Px:f:m:nqr:R:s:t:T:o:u:O:Vd:N:b:l:L:";

struct option options[] = {
	{ "algo", 1, NULL, 'a' },
	{ "api-bind", 1, NULL, 'b' },
	{ "api-remote", 0, NULL, 1030 },
	{ "background", 0, NULL, 'B' },
	{ "benchmark", 0, NULL, 1005 },
	{ "cert", 1, NULL, 1001 },
	{ "config", 1, NULL, 'c' },
	{ "cputest", 0, NULL, 1006 },
	{ "cpu-affinity", 1, NULL, 1020 },
	{ "cpu-priority", 1, NULL, 1021 },
	{ "cuda-schedule", 1, NULL, 1025 },
	{ "debug", 0, NULL, 'D' },
	{ "help", 0, NULL, 'h' },
	{ "intensity", 1, NULL, 'i' },
	{ "ndevs", 0, NULL, 'n' },
	{ "no-color", 0, NULL, 1002 },
	{ "no-extranonce", 0, NULL, 1012 },
	{ "no-gbt", 0, NULL, 1011 },
	{ "no-longpoll", 0, NULL, 1003 },
	{ "no-stratum", 0, NULL, 1007 },
	{ "no-autotune", 0, NULL, 1004 },  // scrypt
	{ "interactive", 1, NULL, 1050 },  // scrypt
	{ "launch-config", 1, NULL, 'l' }, // scrypt
	{ "lookup-gap", 1, NULL, 'L' },    // scrypt
	{ "texture-cache", 1, NULL, 1051 },// scrypt
	{ "max-temp", 1, NULL, 1060 },
	{ "max-diff", 1, NULL, 1061 },
	{ "max-rate", 1, NULL, 1062 },
	{ "resume-diff", 1, NULL, 1063 },
	{ "resume-rate", 1, NULL, 1064 },
	{ "resume-temp", 1, NULL, 1065 },
	{ "pass", 1, NULL, 'p' },
	{ "pool-name", 1, NULL, 1100 },     // pool
	{ "pool-algo", 1, NULL, 1101 },     // pool
	{ "pool-scantime", 1, NULL, 1102 }, // pool
	{ "pool-shares-limit", 1, NULL, 1109 },
	{ "pool-time-limit", 1, NULL, 1108 },
	{ "pool-max-diff", 1, NULL, 1161 }, // pool
	{ "pool-max-rate", 1, NULL, 1162 }, // pool
	{ "pool-disabled", 1, NULL, 1199 }, // pool
	{ "protocol-dump", 0, NULL, 'P' },
	{ "proxy", 1, NULL, 'x' },
	{ "quiet", 0, NULL, 'q' },
	{ "retries", 1, NULL, 'r' },
	{ "retry-pause", 1, NULL, 'R' },
	{ "scantime", 1, NULL, 's' },
	{ "show-diff", 0, NULL, 1013 },
	{ "statsavg", 1, NULL, 'N' },
	{ "gpu-clock", 1, NULL, 1070 },
	{ "mem-clock", 1, NULL, 1071 },
	{ "pstate", 1, NULL, 1072 },
	{ "plimit", 1, NULL, 1073 },
	{ "keep-clocks", 0, NULL, 1074 },
	{ "tlimit", 1, NULL, 1075 },
	{ "led", 1, NULL, 1080 },
#ifdef HAVE_SYSLOG_H
	{ "syslog", 0, NULL, 'S' },
	{ "syslog-prefix", 1, NULL, 1018 },
#endif
	{ "shares-limit", 1, NULL, 1009 },
	{ "time-limit", 1, NULL, 1008 },
	{ "threads", 1, NULL, 't' },
	{ "vote", 1, NULL, 1022 },
	{ "trust-pool", 0, NULL, 1023 },
	{ "timeout", 1, NULL, 'T' },
	{ "url", 1, NULL, 'o' },
	{ "user", 1, NULL, 'u' },
	{ "userpass", 1, NULL, 'O' },
	{ "version", 0, NULL, 'V' },
	{ "devices", 1, NULL, 'd' },
	{ "diff-multiplier", 1, NULL, 'm' },
	{ "diff-factor", 1, NULL, 'f' },
	{ "diff", 1, NULL, 'f' }, // compat
	{ 0, 0, 0, 0 }
};

static char const scrypt_usage[] = "\n\
Scrypt specific options:\n\
  -l, --launch-config   gives the launch configuration for each kernel\n\
                        in a comma separated list, one per device.\n\
  -L, --lookup-gap      Divides the per-hash memory requirement by this factor\n\
                        by storing only every N'th value in the scratchpad.\n\
                        Default is 1.\n\
      --interactive     comma separated list of flags (0/1) specifying\n\
                        which of the CUDA device you need to run at inter-\n\
                        active frame rates (because it drives a display).\n\
      --texture-cache   comma separated list of flags (0/1/2) specifying\n\
                        which of the CUDA devices shall use the texture\n\
                        cache for mining. Kepler devices may profit.\n\
      --no-autotune     disable auto-tuning of kernel launch parameters\n\
";

struct work _ALIGN(64) g_work;
volatile time_t g_work_time;
pthread_mutex_t g_work_lock;

// get const array size (defined in ccminer.cpp)
int options_count()
{
	int n = 0;
	while (options[n].name != NULL)
		n++;
	return n;
}

#ifdef __linux /* Linux specific policy and affinity management */
#include <sched.h>
static inline void drop_policy(void) {
	struct sched_param param;
	param.sched_priority = 0;
#ifdef SCHED_IDLE
	if (unlikely(sched_setscheduler(0, SCHED_IDLE, &param) == -1))
#endif
#ifdef SCHED_BATCH
		sched_setscheduler(0, SCHED_BATCH, &param);
#endif
}

static void affine_to_cpu_mask(int id, unsigned long mask) {
	cpu_set_t set;
	CPU_ZERO(&set);
	for (uint8_t i = 0; i < num_cpus; i++) {
		// cpu mask
		if (mask & (1UL<<i)) { CPU_SET(i, &set); }
	}
	if (id == -1) {
		// process affinity
		sched_setaffinity(0, sizeof(&set), &set);
	} else {
		// thread only
		pthread_setaffinity_np(thr_info[id].pth, sizeof(&set), &set);
	}
}
#elif defined(__FreeBSD__) /* FreeBSD specific policy and affinity management */
#include <sys/cpuset.h>
static inline void drop_policy(void) { }
static void affine_to_cpu_mask(int id, unsigned long mask) {
	cpuset_t set;
	CPU_ZERO(&set);
	for (uint8_t i = 0; i < num_cpus; i++) {
		if (mask & (1UL<<i)) CPU_SET(i, &set);
	}
	cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, -1, sizeof(cpuset_t), &set);
}
#elif defined(WIN32) /* Windows */
static inline void drop_policy(void) { }
static void affine_to_cpu_mask(int id, unsigned long mask) {
	if (id == -1)
		SetProcessAffinityMask(GetCurrentProcess(), mask);
	else
		SetThreadAffinityMask(GetCurrentThread(), mask);
}
#else /* Martians */
static inline void drop_policy(void) { }
static void affine_to_cpu_mask(int id, uint8_t mask) { }
#endif

static bool get_blocktemplate(CURL *curl, struct work *work);

void get_currentalgo(char* buf, int sz)
{
	snprintf(buf, sz, "%s", algo_names[opt_algo]);
}

/**
 * Exit app
 */
void proper_exit(int reason)
{
	restart_threads();
	if (abort_flag) /* already called */
		return;

	abort_flag = true;
	usleep(200 * 1000);
	cuda_shutdown();

	if (reason == EXIT_CODE_OK && app_exit_code != EXIT_CODE_OK) {
		reason = app_exit_code;
	}

	pthread_mutex_lock(&stats_lock);
	if (check_dups)
		hashlog_purge_all();
	stats_purge_all();
	pthread_mutex_unlock(&stats_lock);

#ifdef WIN32
	timeEndPeriod(1); // else never executed
#endif
#ifdef USE_WRAPNVML
	if (hnvml) {
		for (int n=0; n < opt_n_threads && !opt_keep_clocks; n++) {
			nvml_reset_clocks(hnvml, device_map[n]);
		}
		nvml_destroy(hnvml);
	}
#endif
	free(opt_syslog_pfx);
	free(opt_api_allow);
	//free(work_restart);
	//free(thr_info);
	exit(reason);
}

static bool jobj_binary(const json_t *obj, const char *key,
			void *buf, size_t buflen)
{
	const char *hexstr;
	json_t *tmp;

	tmp = json_object_get(obj, key);
	if (unlikely(!tmp)) {
		applog(LOG_ERR, "JSON key '%s' not found", key);
		return false;
	}
	hexstr = json_string_value(tmp);
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "JSON key '%s' is not a string", key);
		return false;
	}
	if (!hex2bin((uchar*)buf, hexstr, buflen))
		return false;

	return true;
}

/* compute nbits to get the network diff */
static void calc_network_diff(struct work *work)
{
	// sample for diff 43.281 : 1c05ea29
	// todo: endian reversed on longpoll could be zr5 specific...
	uint32_t nbits = have_longpoll ? work->data[18] : swab32(work->data[18]);
	if (opt_algo == ALGO_LBRY) nbits = swab32(work->data[26]);
	if (opt_algo == ALGO_DECRED) nbits = work->data[29];
	if (opt_algo == ALGO_SIA) nbits = work->data[11]; // unsure if correct

	uint32_t bits = (nbits & 0xffffff);
	int16_t shift = (swab32(nbits) & 0xff); // 0x1c = 28

	uint64_t diffone = 0x0000FFFF00000000ull;
	double d = (double)0x0000ffff / (double)bits;

	for (int m=shift; m < 29; m++) d *= 256.0;
	for (int m=29; m < shift; m++) d /= 256.0;
	if (opt_algo == ALGO_DECRED && shift == 28) d *= 256.0;
	if (opt_debug_diff)
		applog(LOG_DEBUG, "net diff: %f -> shift %u, bits %08x", d, shift, bits);

	net_diff = d;
}

/* decode data from getwork (wallets and longpoll pools) */
static bool work_decode(const json_t *val, struct work *work)
{
	int data_size, target_size = sizeof(work->target);
	int adata_sz, atarget_sz = ARRAY_SIZE(work->target);
	int i;

	switch (opt_algo) {
	case ALGO_DECRED:
		data_size = 192;
		adata_sz = 180/4;
		break;
	case ALGO_NEOSCRYPT:
	case ALGO_ZR5:
		data_size = 80;
		adata_sz = data_size / 4;
		break;
	default:
		data_size = 128;
		adata_sz = data_size / 4;
	}

	if (!jobj_binary(val, "data", work->data, data_size)) {
		json_t *obj = json_object_get(val, "data");
		int len = obj ? (int) strlen(json_string_value(obj)) : 0;
		if (!len || len > sizeof(work->data)*2) {
			applog(LOG_ERR, "JSON invalid data (len %d <> %d)", len/2, data_size);
			return false;
		} else {
			data_size = len / 2;
			if (!jobj_binary(val, "data", work->data, data_size)) {
				applog(LOG_ERR, "JSON invalid data (len %d)", data_size);
				return false;
			}
		}
	}

	if (!jobj_binary(val, "target", work->target, target_size)) {
		applog(LOG_ERR, "JSON invalid target");
		return false;
	}

	if (opt_algo == ALGO_HEAVY) {
		if (unlikely(!jobj_binary(val, "maxvote", &work->maxvote, sizeof(work->maxvote)))) {
			work->maxvote = 2048;
		}
	} else work->maxvote = 0;

	for (i = 0; i < adata_sz; i++)
		work->data[i] = le32dec(work->data + i);
	for (i = 0; i < atarget_sz; i++)
		work->target[i] = le32dec(work->target + i);

	if ((opt_showdiff || opt_max_diff > 0.) && !allow_mininginfo)
		calc_network_diff(work);

	work->targetdiff = target_to_diff(work->target);

	// for api stats, on longpoll pools
	stratum_diff = work->targetdiff;

	work->tx_count = use_pok = 0;
	if (opt_algo == ALGO_ZR5 && work->data[0] & POK_BOOL_MASK) {
		use_pok = 1;
		json_t *txs = json_object_get(val, "txs");
		if (txs && json_is_array(txs)) {
			size_t idx, totlen = 0;
			json_t *p;

			json_array_foreach(txs, idx, p) {
				const int tx = work->tx_count % POK_MAX_TXS;
				const char* hexstr = json_string_value(p);
				size_t txlen = strlen(hexstr)/2;
				work->tx_count++;
				if (work->tx_count > POK_MAX_TXS || txlen >= POK_MAX_TX_SZ) {
					// when tx is too big, just reset use_pok for the block
					use_pok = 0;
					if (opt_debug) applog(LOG_WARNING,
						"pok: large block ignored, tx len: %u", txlen);
					work->tx_count = 0;
					break;
				}
				hex2bin((uchar*)work->txs[tx].data, hexstr, min(txlen, POK_MAX_TX_SZ));
				work->txs[tx].len = (uint32_t) (txlen);
				totlen += txlen;
			}
			if (opt_debug)
				applog(LOG_DEBUG, "block txs: %u, total len: %u", work->tx_count, totlen);
		}
	}

	/* use work ntime as job id (solo-mining) */
	cbin2hex(work->job_id, (const char*)&work->data[17], 4);

	if (opt_algo == ALGO_DECRED) {
		uint16_t vote;
		// always keep last bit of votebits
		memcpy(&vote, &work->data[25], 2);
		vote = (opt_vote << 1) | (vote & 1);
		memcpy(&work->data[25], &vote, 2);
		// some random extradata to make it unique
		work->data[36] = (rand()*4);
		work->data[37] = (rand()*4) << 8;
		// required for the longpoll pool block info...
		work->height = work->data[32];
		if (!have_longpoll && work->height > net_blocks + 1) {
			char netinfo[64] = { 0 };
			if (opt_showdiff && net_diff > 0.) {
				if (net_diff != work->targetdiff)
					sprintf(netinfo, ", diff %.3f, pool %.1f", net_diff, work->targetdiff);
				else
					sprintf(netinfo, ", diff %.3f", net_diff);
			}
			applog(LOG_BLUE, "%s block %d%s",
				algo_names[opt_algo], work->height, netinfo);
			net_blocks = work->height - 1;
		}
		cbin2hex(work->job_id, (const char*)&work->data[34], 4);
	}

	return true;
}

// ---- SIA LONGPOLL --------------------------------------------------------------------------------

struct data_buffer {
	void *buf;
	size_t len;
};

static size_t sia_data_cb(const void *ptr, size_t size, size_t nmemb,
			  void *user_data)
{
	struct data_buffer *db = (struct data_buffer *)user_data;
	size_t len = size * nmemb;
	size_t oldlen, newlen;
	void *newmem;
	static const uchar zero = 0;

	oldlen = db->len;
	newlen = oldlen + len;

	newmem = realloc(db->buf, newlen + 1);
	if (!newmem)
		return 0;

	db->buf = newmem;
	db->len = newlen;
	memcpy((char*)db->buf + oldlen, ptr, len);
	memcpy((char*)db->buf + newlen, &zero, 1);	/* null terminate */

	return len;
}

char* sia_getheader(CURL *curl, struct pool_infos *pool)
{
	char curl_err_str[CURL_ERROR_SIZE] = { 0 };
	struct data_buffer all_data = { 0 };
	struct curl_slist *headers = NULL;
	char data[256] = { 0 };
	char url[512];

	// nanopool
	snprintf(url, 512, "%s/miner/header?address=%s&worker=%s", //&longpoll
		pool->url, pool->user, pool->pass);

	if (opt_protocol)
		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
	curl_easy_setopt(curl, CURLOPT_URL, url);
	curl_easy_setopt(curl, CURLOPT_POST, 0);
	curl_easy_setopt(curl, CURLOPT_ENCODING, "");
	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 0);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 1);
	curl_easy_setopt(curl, CURLOPT_TIMEOUT, opt_timeout);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, sia_data_cb);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &all_data);

	headers = curl_slist_append(headers, "Accept: application/octet-stream");
	headers = curl_slist_append(headers, "Expect:"); // disable Expect hdr
	headers = curl_slist_append(headers, "User-Agent: Sia-Agent"); // required for now
//	headers = curl_slist_append(headers, "User-Agent: " USER_AGENT);
//	headers = curl_slist_append(headers, "X-Mining-Extensions: longpoll");

	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

	int rc = curl_easy_perform(curl);
	if (rc && strlen(curl_err_str)) {
		applog(LOG_WARNING, "%s", curl_err_str);
	}

	if (all_data.len >= 112)
		cbin2hex(data, (const char*) all_data.buf, 112);
	if (opt_protocol || all_data.len != 112)
		applog(LOG_DEBUG, "received %d bytes: %s", (int) all_data.len, data);

	curl_slist_free_all(headers);

	return rc == 0 && all_data.len ? strdup(data) : NULL;
}

bool sia_work_decode(const char *hexdata, struct work *work)
{
	uint8_t target[32];
	if (!work) return false;

	hex2bin((uchar*)target, &hexdata[0], 32);
	swab256(work->target, target);
	work->targetdiff = target_to_diff(work->target);

	hex2bin((uchar*)work->data, &hexdata[64], 80);
	// high 16 bits of the 64 bits nonce
	work->data[9] = rand() << 16;

	// use work ntime as job id
	cbin2hex(work->job_id, (const char*)&work->data[10], 4);
	calc_network_diff(work);

	if (stratum_diff != work->targetdiff) {
		stratum_diff = work->targetdiff;
		applog(LOG_WARNING, "Pool diff set to %g", stratum_diff);
	}

	return true;
}

int share_result(int result, int pooln, double sharediff, const char *reason);

bool sia_submit(CURL *curl, struct pool_infos *pool, struct work *work)
{
	char curl_err_str[CURL_ERROR_SIZE] = { 0 };
	struct data_buffer all_data = { 0 };
	struct curl_slist *headers = NULL;
	char buf[256] = { 0 };
	char url[512];

	if (opt_protocol)
		applog_hex(work->data, 80);
	//applog_hex(&work->data[8], 16);
	//applog_hex(&work->data[10], 4);

	// nanopool
	snprintf(url, 512, "%s/miner/header?address=%s&worker=%s",
		pool->url, pool->user, pool->pass);

	if (opt_protocol)
		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
	curl_easy_setopt(curl, CURLOPT_URL, url);
	curl_easy_setopt(curl, CURLOPT_ENCODING, "");
	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 0);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 1);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10);

	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &all_data);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, sia_data_cb);

	memcpy(buf, work->data, 80);
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 80);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, (void*) buf);

//	headers = curl_slist_append(headers, "Content-Type: application/octet-stream");
//	headers = curl_slist_append(headers, "Content-Length: 80");
	headers = curl_slist_append(headers, "Accept:"); // disable Accept hdr
	headers = curl_slist_append(headers, "Expect:"); // disable Expect hdr
	headers = curl_slist_append(headers, "User-Agent: Sia-Agent");
//	headers = curl_slist_append(headers, "User-Agent: " USER_AGENT);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

	int res = curl_easy_perform(curl) == 0;
	long errcode;
	CURLcode c = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &errcode);
	if (errcode != 204) {
		if (strlen(curl_err_str))
			applog(LOG_ERR, "submit err %ld %s", errcode, curl_err_str);
		res = 0;
	}
	share_result(res, work->pooln, work->sharediff, res ? NULL : (char*) all_data.buf);

	curl_slist_free_all(headers);
	return true;
}

// ---- END SIA LONGPOLL ----------------------------------------------------------------------------

#define YES "yes!"
#define YAY "yay!!!"
#define BOO "booooo"

int share_result(int result, int pooln, double sharediff, const char *reason)
{
	const char *flag;
	char suppl[32] = { 0 };
	char s[32] = { 0 };
	double hashrate = 0.;
	struct pool_infos *p = &pools[pooln];

	pthread_mutex_lock(&stats_lock);
	for (int i = 0; i < opt_n_threads; i++) {
		hashrate += stats_get_speed(i, thr_hashrates[i]);
	}
	pthread_mutex_unlock(&stats_lock);

	result ? p->accepted_count++ : p->rejected_count++;

	p->last_share_time = time(NULL);
	if (sharediff > p->best_share)
		p->best_share = sharediff;

	global_hashrate = llround(hashrate);

	format_hashrate(hashrate, s);
	if (opt_showdiff)
		sprintf(suppl, "diff %.3f", sharediff);
	else // accepted percent
		sprintf(suppl, "%.2f%%", 100. * p->accepted_count / (p->accepted_count + p->rejected_count));

	if (!net_diff || sharediff < net_diff) {
		flag = use_colors ?
			(result ? CL_GRN YES : CL_RED BOO)
		:	(result ? "(" YES ")" : "(" BOO ")");
	} else {
		p->solved_count++;
		flag = use_colors ?
			(result ? CL_GRN YAY : CL_RED BOO)
		:	(result ? "(" YAY ")" : "(" BOO ")");
	}

	applog(LOG_NOTICE, "accepted: %lu/%lu (%s), %s %s",
			p->accepted_count,
			p->accepted_count + p->rejected_count,
			suppl, s, flag);
	if (reason) {
		applog(LOG_WARNING, "reject reason: %s", reason);
		if (!check_dups && strncasecmp(reason, "duplicate", 9) == 0) {
			applog(LOG_WARNING, "enabling duplicates check feature");
			check_dups = true;
			g_work_time = 0;
		}
	}
	return 1;
}

static bool submit_upstream_work(CURL *curl, struct work *work)
{
	char s[512];
	struct pool_infos *pool = &pools[work->pooln];
	json_t *val, *res, *reason;
	bool stale_work = false;

	/* discard if a newer block was received */
	stale_work = work->height && work->height < g_work.height;
	if (have_stratum && !stale_work && opt_algo != ALGO_ZR5 && opt_algo != ALGO_SCRYPT_JANE) {
		pthread_mutex_lock(&g_work_lock);
		if (strlen(work->job_id + 8))
			stale_work = strncmp(work->job_id + 8, g_work.job_id + 8, sizeof(g_work.job_id) - 8);
		if (stale_work) {
			pool->stales_count++;
			if (opt_debug) applog(LOG_DEBUG, "outdated job %s, new %s stales=%d",
				work->job_id + 8 , g_work.job_id + 8, pool->stales_count);
			if (!check_stratum_jobs && pool->stales_count > 5) {
				if (!opt_quiet) applog(LOG_WARNING, "Enabled stratum stale jobs workaround");
				check_stratum_jobs = true;
			}
		}
		pthread_mutex_unlock(&g_work_lock);
	}

	if (!have_stratum && !stale_work && allow_gbt) {
		struct work wheight = { 0 };
		if (get_blocktemplate(curl, &wheight)) {
			if (work->height && work->height < wheight.height) {
				if (opt_debug)
					applog(LOG_WARNING, "block %u was already solved", work->height);
				return true;
			}
		}
	}

	if (!stale_work && opt_algo == ALGO_ZR5 && !have_stratum) {
		stale_work = (memcmp(&work->data[1], &g_work.data[1], 68));
	}

	if (!submit_old && stale_work) {
		if (opt_debug)
			applog(LOG_WARNING, "stale work detected, discarding");
		return true;
	}

	if (pool->type & POOL_STRATUM) {
		uint32_t sent = 0;
		uint32_t ntime, nonce;
		char *ntimestr, *noncestr, *xnonce2str, *nvotestr;
		uint16_t nvote = 0;

		switch (opt_algo) {
		case ALGO_BLAKE:
		case ALGO_BLAKECOIN:
		case ALGO_BLAKE2S:
		case ALGO_BMW:
		case ALGO_VANILLA:
			// fast algos require that... (todo: regen hash)
			check_dups = true;
			le32enc(&ntime, work->data[17]);
			le32enc(&nonce, work->data[19]);
			break;
		case ALGO_DECRED:
			be16enc(&nvote, *((uint16_t*)&work->data[25]));
			be32enc(&ntime, work->data[34]);
			be32enc(&nonce, work->data[35]);
			break;
		case ALGO_HEAVY:
			le32enc(&ntime, work->data[17]);
			le32enc(&nonce, work->data[19]);
			be16enc(&nvote, *((uint16_t*)&work->data[20]));
			break;
		case ALGO_LBRY:
			check_dups = true;
			le32enc(&ntime, work->data[25]);
			le32enc(&nonce, work->data[27]);
			break;
		case ALGO_SIA:
			be32enc(&ntime, work->data[10]);
			be32enc(&nonce, work->data[8]);
			break;
		case ALGO_ZR5:
			check_dups = true;
			be32enc(&ntime, work->data[17]);
			be32enc(&nonce, work->data[19]);
			break;
		default:
			le32enc(&ntime, work->data[17]);
			le32enc(&nonce, work->data[19]);
		}
		noncestr = bin2hex((const uchar*)(&nonce), 4);

		if (check_dups)
			sent = hashlog_already_submittted(work->job_id, nonce);
		if (sent > 0) {
			sent = (uint32_t) time(NULL) - sent;
			if (!opt_quiet) {
				applog(LOG_WARNING, "nonce %s was already sent %u seconds ago", noncestr, sent);
				hashlog_dump_job(work->job_id);
			}
			free(noncestr);
			// prevent useless computing on some pools
			g_work_time = 0;
			restart_threads();
			return true;
		}

		ntimestr = bin2hex((const uchar*)(&ntime), 4);

		if (opt_algo == ALGO_DECRED) {
			xnonce2str = bin2hex((const uchar*)&work->data[36], stratum.xnonce1_size);
		} else if (opt_algo == ALGO_SIA) {
			uint16_t high_nonce = swab32(work->data[9]) >> 16;
			xnonce2str = bin2hex((unsigned char*)(&high_nonce), 2);
		} else {
			xnonce2str = bin2hex(work->xnonce2, work->xnonce2_len);
		}

		// store to keep/display the solved ratio/diff
		stratum.sharediff = work->sharediff;

		if (net_diff && stratum.sharediff > net_diff && (opt_debug || opt_debug_diff))
			applog(LOG_INFO, "share diff: %.5f, possible block found!!!",
				stratum.sharediff);
		else if (opt_debug_diff)
			applog(LOG_DEBUG, "share diff: %.5f (x %.1f)",
				stratum.sharediff, work->shareratio);

		if (opt_vote) { // ALGO_HEAVY ALGO_DECRED
			nvotestr = bin2hex((const uchar*)(&nvote), 2);
			sprintf(s, "{\"method\": \"mining.submit\", \"params\": ["
					"\"%s\", \"%s\", \"%s\", \"%s\", \"%s\", \"%s\"], \"id\":4}",
					pool->user, work->job_id + 8, xnonce2str, ntimestr, noncestr, nvotestr);
			free(nvotestr);
		} else {
			sprintf(s, "{\"method\": \"mining.submit\", \"params\": ["
					"\"%s\", \"%s\", \"%s\", \"%s\", \"%s\"], \"id\":4}",
					pool->user, work->job_id + 8, xnonce2str, ntimestr, noncestr);
		}
		free(xnonce2str);
		free(ntimestr);
		free(noncestr);

		gettimeofday(&stratum.tv_submit, NULL);
		if (unlikely(!stratum_send_line(&stratum, s))) {
			applog(LOG_ERR, "submit_upstream_work stratum_send_line failed");
			return false;
		}

		if (check_dups)
			hashlog_remember_submit(work, nonce);

	} else {

		int data_size = 128;
		int adata_sz = data_size / sizeof(uint32_t);

		/* build hex string */
		char *str = NULL;

		if (opt_algo == ALGO_ZR5) {
			data_size = 80; adata_sz = 20;
		}
		else if (opt_algo == ALGO_DECRED) {
			data_size = 192; adata_sz = 180/4;
		}
		else if (opt_algo == ALGO_SIA) {
			return sia_submit(curl, pool, work);
		}

		if (opt_algo != ALGO_HEAVY && opt_algo != ALGO_MJOLLNIR) {
			for (int i = 0; i < adata_sz; i++)
				le32enc(work->data + i, work->data[i]);
		}
		str = bin2hex((uchar*)work->data, data_size);
		if (unlikely(!str)) {
			applog(LOG_ERR, "submit_upstream_work OOM");
			return false;
		}

		/* build JSON-RPC request */
		sprintf(s,
			"{\"method\": \"getwork\", \"params\": [\"%s\"], \"id\":4}\r\n",
			str);

		/* issue JSON-RPC request */
		val = json_rpc_call_pool(curl, pool, s, false, false, NULL);
		if (unlikely(!val)) {
			applog(LOG_ERR, "submit_upstream_work json_rpc_call failed");
			return false;
		}

		res = json_object_get(val, "result");
		reason = json_object_get(val, "reject-reason");
		if (!share_result(json_is_true(res), work->pooln, work->sharediff,
				reason ? json_string_value(reason) : NULL))
		{
			if (check_dups)
				hashlog_purge_job(work->job_id);
		}

		json_decref(val);

		free(str);
	}

	return true;
}

/* simplified method to only get some extra infos in solo mode */
static bool gbt_work_decode(const json_t *val, struct work *work)
{
	json_t *err = json_object_get(val, "error");
	if (err && !json_is_null(err)) {
		allow_gbt = false;
		applog(LOG_INFO, "GBT not supported, block height unavailable");
		return false;
	}

	if (!work->height) {
		// complete missing data from getwork
		json_t *key = json_object_get(val, "height");
		if (key && json_is_integer(key)) {
			work->height = (uint32_t) json_integer_value(key);
			if (!opt_quiet && work->height > g_work.height) {
				if (net_diff > 0.) {
					char netinfo[64] = { 0 };
					char srate[32] = { 0 };
					sprintf(netinfo, "diff %.2f", net_diff);
					if (net_hashrate) {
						format_hashrate((double) net_hashrate, srate);
						strcat(netinfo, ", net ");
						strcat(netinfo, srate);
					}
					applog(LOG_BLUE, "%s block %d, %s",
						algo_names[opt_algo], work->height, netinfo);
				} else {
					applog(LOG_BLUE, "%s %s block %d", short_url,
						algo_names[opt_algo], work->height);
				}
				g_work.height = work->height;
			}
		}
	}

	return true;
}

#define GBT_CAPABILITIES "[\"coinbasetxn\", \"coinbasevalue\", \"longpoll\", \"workid\"]"
static const char *gbt_req =
	"{\"method\": \"getblocktemplate\", \"params\": [{"
	//	"\"capabilities\": " GBT_CAPABILITIES ""
	"}], \"id\":9}\r\n";

static bool get_blocktemplate(CURL *curl, struct work *work)
{
	struct pool_infos *pool = &pools[work->pooln];
	if (!allow_gbt)
		return false;

	int curl_err = 0;
	json_t *val = json_rpc_call_pool(curl, pool, gbt_req, false, false, &curl_err);

	if (!val && curl_err == -1) {
		// when getblocktemplate is not supported, disable it
		allow_gbt = false;
		if (!opt_quiet) {
				applog(LOG_BLUE, "gbt not supported, block height notices disabled");
		}
		return false;
	}

	bool rc = gbt_work_decode(json_object_get(val, "result"), work);

	json_decref(val);

	return rc;
}

// good alternative for wallet mining, difficulty and net hashrate
static const char *info_req =
	"{\"method\": \"getmininginfo\", \"params\": [], \"id\":8}\r\n";

static bool get_mininginfo(CURL *curl, struct work *work)
{
	struct pool_infos *pool = &pools[work->pooln];
	int curl_err = 0;

	if (have_stratum || have_longpoll || !allow_mininginfo)
		return false;

	json_t *val = json_rpc_call_pool(curl, pool, info_req, false, false, &curl_err);

	if (!val && curl_err == -1) {
		allow_mininginfo = false;
		if (opt_debug) {
				applog(LOG_DEBUG, "getmininginfo not supported");
		}
		return false;
	} else {
		json_t *res = json_object_get(val, "result");
		// "blocks": 491493 (= current work height - 1)
		// "difficulty": 0.99607860999999998
		// "networkhashps": 56475980
		// "netmhashps": 351.74414726
		if (res) {
			json_t *key = json_object_get(res, "difficulty");
			if (key) {
				if (json_is_object(key))
					key = json_object_get(key, "proof-of-work");
				if (json_is_real(key))
					net_diff = json_real_value(key);
			}
			key = json_object_get(res, "networkhashps");
			if (key && json_is_integer(key)) {
				net_hashrate = json_integer_value(key);
			}
			key = json_object_get(res, "netmhashps");
			if (key && json_is_real(key)) {
				net_hashrate = (uint64_t)(json_real_value(key) * 1e6);
			}
			key = json_object_get(res, "blocks");
			if (key && json_is_integer(key)) {
				net_blocks = json_integer_value(key);
			}
		}
	}
	json_decref(val);
	return true;
}

static const char *json_rpc_getwork =
	"{\"method\":\"getwork\",\"params\":[],\"id\":0}\r\n";

static bool get_upstream_work(CURL *curl, struct work *work)
{
	bool rc = false;
	struct timeval tv_start, tv_end, diff;
	struct pool_infos *pool = &pools[work->pooln];
	const char *rpc_req = json_rpc_getwork;
	json_t *val;

	gettimeofday(&tv_start, NULL);

	if (opt_algo == ALGO_SIA) {
		char *sia_header = sia_getheader(curl, pool);
		if (sia_header) {
			rc = sia_work_decode(sia_header, work);
			free(sia_header);
		}
		gettimeofday(&tv_end, NULL);
		if (have_stratum || unlikely(work->pooln != cur_pooln)) {
			return rc;
		}
		return rc;
	}

	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s: want_longpoll=%d have_longpoll=%d",
			__func__, want_longpoll, have_longpoll);

	/* want_longpoll/have_longpoll required here to init/unlock the lp thread */
	val = json_rpc_call_pool(curl, pool, rpc_req, want_longpoll, have_longpoll, NULL);
	gettimeofday(&tv_end, NULL);

	if (have_stratum || unlikely(work->pooln != cur_pooln)) {
		if (val)
			json_decref(val);
		return false;
	}

	if (!val)
		return false;

	rc = work_decode(json_object_get(val, "result"), work);

	if (opt_protocol && rc) {
		timeval_subtract(&diff, &tv_end, &tv_start);
		/* show time because curl can be slower against versions/config */
		applog(LOG_DEBUG, "got new work in %.2f ms",
		       (1000.0 * diff.tv_sec) + (0.001 * diff.tv_usec));
	}

	json_decref(val);

	get_mininginfo(curl, work);
	get_blocktemplate(curl, work);

	return rc;
}

static void workio_cmd_free(struct workio_cmd *wc)
{
	if (!wc)
		return;

	switch (wc->cmd) {
	case WC_SUBMIT_WORK:
		aligned_free(wc->u.work);
		break;
	default: /* do nothing */
		break;
	}

	memset(wc, 0, sizeof(*wc));	/* poison */
	free(wc);
}

static void workio_abort()
{
	struct workio_cmd *wc;

	/* fill out work request message */
	wc = (struct workio_cmd *)calloc(1, sizeof(*wc));
	if (!wc)
		return;

	wc->cmd = WC_ABORT;

	/* send work request to workio thread */
	if (!tq_push(thr_info[work_thr_id].q, wc)) {
		workio_cmd_free(wc);
	}
}

static bool workio_get_work(struct workio_cmd *wc, CURL *curl)
{
	struct work *ret_work;
	int failures = 0;

	ret_work = (struct work*)aligned_calloc(sizeof(struct work));
	if (!ret_work)
		return false;

	/* assign pool number before rpc calls */
	ret_work->pooln = wc->pooln;
	// applog(LOG_DEBUG, "%s: pool %d", __func__, wc->pooln);

	/* obtain new work from bitcoin via JSON-RPC */
	while (!get_upstream_work(curl, ret_work)) {

		if (unlikely(ret_work->pooln != cur_pooln)) {
			applog(LOG_ERR, "get_work json_rpc_call failed");
			aligned_free(ret_work);
			tq_push(wc->thr->q, NULL);
			return true;
		}

		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "get_work json_rpc_call failed");
			aligned_free(ret_work);
			return false;
		}

		/* pause, then restart work-request loop */
		applog(LOG_ERR, "get_work failed, retry after %d seconds",
			opt_fail_pause);
		sleep(opt_fail_pause);
	}

	/* send work to requesting thread */
	if (!tq_push(wc->thr->q, ret_work))
		aligned_free(ret_work);

	return true;
}

static bool workio_submit_work(struct workio_cmd *wc, CURL *curl)
{
	int failures = 0;
	uint32_t pooln = wc->pooln;
	// applog(LOG_DEBUG, "%s: pool %d", __func__, wc->pooln);

	/* submit solution to bitcoin via JSON-RPC */
	while (!submit_upstream_work(curl, wc->u.work)) {
		if (pooln != cur_pooln) {
			applog(LOG_DEBUG, "work from pool %u discarded", pooln);
			return true;
		}
		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "...terminating workio thread");
			return false;
		}
		/* pause, then restart work-request loop */
		if (!opt_benchmark)
			applog(LOG_ERR, "...retry after %d seconds", opt_fail_pause);

		sleep(opt_fail_pause);
	}

	return true;
}

static void *workio_thread(void *userdata)
{
	struct thr_info *mythr = (struct thr_info*)userdata;
	CURL *curl;
	bool ok = true;

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialization failed");
		return NULL;
	}

	while (ok && !abort_flag) {
		struct workio_cmd *wc;

		/* wait for workio_cmd sent to us, on our queue */
		wc = (struct workio_cmd *)tq_pop(mythr->q, NULL);
		if (!wc) {
			ok = false;
			break;
		}

		/* process workio_cmd */
		switch (wc->cmd) {
		case WC_GET_WORK:
			ok = workio_get_work(wc, curl);
			break;
		case WC_SUBMIT_WORK:
			if (opt_led_mode == LED_MODE_SHARES)
				gpu_led_on(device_map[wc->thr->id]);
			ok = workio_submit_work(wc, curl);
			if (opt_led_mode == LED_MODE_SHARES)
				gpu_led_off(device_map[wc->thr->id]);
			break;
		case WC_ABORT:
		default:		/* should never happen */
			ok = false;
			break;
		}

		if (!ok && num_pools > 1 && opt_pool_failover) {
			if (opt_debug_threads)
				applog(LOG_DEBUG, "%s died, failover", __func__);
			ok = pool_switch_next(-1);
			tq_push(wc->thr->q, NULL); // get_work() will return false
		}

		workio_cmd_free(wc);
	}

	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() died", __func__);
	curl_easy_cleanup(curl);
	tq_freeze(mythr->q);
	return NULL;
}

bool get_work(struct thr_info *thr, struct work *work)
{
	struct workio_cmd *wc;
	struct work *work_heap;

	if (opt_benchmark) {
		memset(work->data, 0x55, 76);
		//work->data[17] = swab32((uint32_t)time(NULL));
		memset(work->data + 19, 0x00, 52);
		if (opt_algo == ALGO_DECRED) {
			memset(&work->data[35], 0x00, 52);
		} else if (opt_algo == ALGO_LBRY) {
			work->data[28] = 0x80000000;
		} else {
			work->data[20] = 0x80000000;
			work->data[31] = 0x00000280;
		}
		memset(work->target, 0x00, sizeof(work->target));
		return true;
	}

	/* fill out work request message */
	wc = (struct workio_cmd *)calloc(1, sizeof(*wc));
	if (!wc)
		return false;

	wc->cmd = WC_GET_WORK;
	wc->thr = thr;
	wc->pooln = cur_pooln;

	/* send work request to workio thread */
	if (!tq_push(thr_info[work_thr_id].q, wc)) {
		workio_cmd_free(wc);
		return false;
	}

	/* wait for response, a unit of work */
	work_heap = (struct work *)tq_pop(thr->q, NULL);
	if (!work_heap)
		return false;

	/* copy returned work into storage provided by caller */
	memcpy(work, work_heap, sizeof(*work));
	aligned_free(work_heap);

	return true;
}

static bool submit_work(struct thr_info *thr, const struct work *work_in)
{
	struct workio_cmd *wc;
	/* fill out work request message */
	wc = (struct workio_cmd *)calloc(1, sizeof(*wc));
	if (!wc)
		return false;

	wc->u.work = (struct work *)aligned_calloc(sizeof(*work_in));
	if (!wc->u.work)
		goto err_out;

	wc->cmd = WC_SUBMIT_WORK;
	wc->thr = thr;
	memcpy(wc->u.work, work_in, sizeof(struct work));
	wc->pooln = work_in->pooln;

	/* send solution to workio thread */
	if (!tq_push(thr_info[work_thr_id].q, wc))
		goto err_out;

	return true;

err_out:
	workio_cmd_free(wc);
	return false;
}

static bool stratum_gen_work(struct stratum_ctx *sctx, struct work *work)
{
	uchar merkle_root[64] = { 0 };
	int i;

	if (!sctx->job.job_id) {
		// applog(LOG_WARNING, "stratum_gen_work: job not yet retrieved");
		return false;
	}

	pthread_mutex_lock(&stratum_work_lock);

	// store the job ntime as high part of jobid
	snprintf(work->job_id, sizeof(work->job_id), "%07x %s",
		be32dec(sctx->job.ntime) & 0xfffffff, sctx->job.job_id);
	work->xnonce2_len = sctx->xnonce2_size;
	memcpy(work->xnonce2, sctx->job.xnonce2, sctx->xnonce2_size);

	// also store the block number
	work->height = sctx->job.height;
	// and the pool of the current stratum
	work->pooln = sctx->pooln;

	/* Generate merkle root */
	switch (opt_algo) {
		case ALGO_DECRED:
		case ALGO_SIA:
			// getwork over stratum, no merkle to generate
			break;
		case ALGO_HEAVY:
		case ALGO_MJOLLNIR:
			heavycoin_hash(merkle_root, sctx->job.coinbase, (int)sctx->job.coinbase_size);
			break;
		case ALGO_FUGUE256:
		case ALGO_GROESTL:
		case ALGO_KECCAK:
		case ALGO_BLAKECOIN:
		case ALGO_WHIRLCOIN:
			SHA256((uchar*)sctx->job.coinbase, sctx->job.coinbase_size, (uchar*)merkle_root);
			break;
		case ALGO_WHIRLPOOL:
		default:
			sha256d(merkle_root, sctx->job.coinbase, (int)sctx->job.coinbase_size);
	}

	for (i = 0; i < sctx->job.merkle_count; i++) {
		memcpy(merkle_root + 32, sctx->job.merkle[i], 32);
		if (opt_algo == ALGO_HEAVY || opt_algo == ALGO_MJOLLNIR)
			heavycoin_hash(merkle_root, merkle_root, 64);
		else
			sha256d(merkle_root, merkle_root, 64);
	}
	
	/* Increment extranonce2 */
	for (i = 0; i < (int)sctx->xnonce2_size && !++sctx->job.xnonce2[i]; i++);

	/* Assemble block header */
	memset(work->data, 0, sizeof(work->data));
	work->data[0] = le32dec(sctx->job.version);
	for (i = 0; i < 8; i++)
		work->data[1 + i] = le32dec((uint32_t *)sctx->job.prevhash + i);

	if (opt_algo == ALGO_DECRED) {
		uint16_t vote;
		for (i = 0; i < 8; i++) // reversed prevhash
			work->data[1 + i] = swab32(work->data[1 + i]);
		// decred header (coinb1) [merkle...nonce]
		memcpy(&work->data[9], sctx->job.coinbase, 108);
		// last vote bit should never be changed
		memcpy(&vote, &work->data[25], 2);
		vote = (opt_vote << 1) | (vote & 1);
		memcpy(&work->data[25], &vote, 2);
		// extradata
		if (sctx->xnonce1_size > sizeof(work->data)-(36*4)) {
			// should never happen...
			applog(LOG_ERR, "extranonce size overflow!");
			sctx->xnonce1_size = sizeof(work->data)-(36*4);
		}
		memcpy(&work->data[36], sctx->xnonce1, sctx->xnonce1_size);
		work->data[37] = (rand()*4) << 8; // random work data
		sctx->job.height = work->data[32];
		//applog_hex(work->data, 180);
	} else if (opt_algo == ALGO_LBRY) {
		for (i = 0; i < 8; i++)
			work->data[9 + i] = be32dec((uint32_t *)merkle_root + i);
		for (i = 0; i < 8; i++)
			work->data[17 + i] = ((uint32_t*)sctx->job.claim)[i];
		work->data[25] = le32dec(sctx->job.ntime);
		work->data[26] = le32dec(sctx->job.nbits);
		work->data[28] = 0x80000000;
	} else if (opt_algo == ALGO_SIA) {
		uint32_t extra = 0;
		memcpy(&extra, &sctx->job.coinbase[32], 2);
		for (i = 0; i < 8; i++) // reversed hash
			work->data[i] = ((uint32_t*)sctx->job.prevhash)[7-i];
		work->data[8] = 0; // nonce
		work->data[9] = swab32(extra) | ((rand() << 8) & 0xffff);
		work->data[10] = be32dec(sctx->job.ntime);
		work->data[11] = be32dec(sctx->job.nbits);
		memcpy(&work->data[12], sctx->job.coinbase, 32); // merkle_root
		work->data[20] = 0x80000000;
		if (opt_debug) applog_hex(work->data, 80);
	} else {
		for (i = 0; i < 8; i++)
			work->data[9 + i] = be32dec((uint32_t *)merkle_root + i);
		work->data[17] = le32dec(sctx->job.ntime);
		work->data[18] = le32dec(sctx->job.nbits);
		work->data[20] = 0x80000000;
		work->data[31] = (opt_algo == ALGO_MJOLLNIR) ? 0x000002A0 : 0x00000280;
	}

	if (opt_showdiff || opt_max_diff > 0.)
		calc_network_diff(work);

	switch (opt_algo) {
	case ALGO_MJOLLNIR:
	case ALGO_HEAVY:
	case ALGO_ZR5:
		for (i = 0; i < 20; i++)
			work->data[i] = swab32(work->data[i]);
		break;
	}

	// HeavyCoin (vote / reward)
	if (opt_algo == ALGO_HEAVY) {
		work->maxvote = 2048;
		uint16_t *ext = (uint16_t*)(&work->data[20]);
		ext[0] = opt_vote;
		ext[1] = be16dec(sctx->job.nreward);
		// applog(LOG_DEBUG, "DEBUG: vote=%hx reward=%hx", ext[0], ext[1]);
	}

	pthread_mutex_unlock(&stratum_work_lock);

	if (opt_debug && opt_algo != ALGO_DECRED && opt_algo != ALGO_SIA) {
		uint32_t utm = work->data[17];
		if (opt_algo != ALGO_ZR5) utm = swab32(utm);
		char *tm = atime2str(utm - sctx->srvtime_diff);
		char *xnonce2str = bin2hex(work->xnonce2, sctx->xnonce2_size);
		applog(LOG_DEBUG, "DEBUG: job_id=%s xnonce2=%s time=%s",
		       work->job_id, xnonce2str, tm);
		free(tm);
		free(xnonce2str);
	}

	if (opt_difficulty == 0.)
		opt_difficulty = 1.;

	switch (opt_algo) {
		case ALGO_JACKPOT:
		case ALGO_NEOSCRYPT:
		case ALGO_SCRYPT:
		case ALGO_SCRYPT_JANE:
			work_set_target(work, sctx->job.diff / (65536.0 * opt_difficulty));
			break;
		case ALGO_DMD_GR:
		case ALGO_FRESH:
		case ALGO_FUGUE256:
		case ALGO_GROESTL:
		case ALGO_LBRY:
		case ALGO_LYRA2v2:
			work_set_target(work, sctx->job.diff / (256.0 * opt_difficulty));
			break;
		case ALGO_KECCAK:
		case ALGO_LYRA2:
			work_set_target(work, sctx->job.diff / (128.0 * opt_difficulty));
			break;
		default:
			work_set_target(work, sctx->job.diff / opt_difficulty);
	}

	if (stratum_diff != sctx->job.diff) {
		char sdiff[32] = { 0 };
		// store for api stats
		stratum_diff = sctx->job.diff;
		if (opt_showdiff && work->targetdiff != stratum_diff)
			snprintf(sdiff, 32, " (%.5f)", work->targetdiff);
		applog(LOG_WARNING, "Stratum difficulty set to %g%s", stratum_diff, sdiff);
	}

	return true;
}

void restart_threads(void)
{
	if (opt_debug && !opt_quiet)
		applog(LOG_DEBUG,"%s", __FUNCTION__);

	for (int i = 0; i < opt_n_threads && work_restart; i++)
		work_restart[i].restart = 1;
}

static bool wanna_mine(int thr_id)
{
	bool state = true;
	bool allow_pool_rotate = (thr_id == 0 && num_pools > 1 && !pool_is_switching);

	if (opt_max_temp > 0.0) {
#ifdef USE_WRAPNVML
		struct cgpu_info * cgpu = &thr_info[thr_id].gpu;
		float temp = gpu_temp(cgpu);
		if (temp > opt_max_temp) {
			if (!conditional_state[thr_id] && !opt_quiet)
				gpulog(LOG_INFO, thr_id, "temperature too high (%.0f°c), waiting...", temp);
			state = false;
		} else if (opt_max_temp > 0. && opt_resume_temp > 0. && conditional_state[thr_id] && temp > opt_resume_temp) {
			if (!thr_id && opt_debug)
				applog(LOG_DEBUG, "temperature did not reach resume value %.1f...", opt_resume_temp);
			state = false;
		}
#endif
	}
	// Network Difficulty
	if (opt_max_diff > 0.0 && net_diff > opt_max_diff) {
		int next = pool_get_first_valid(cur_pooln+1);
		if (num_pools > 1 && pools[next].max_diff != pools[cur_pooln].max_diff && opt_resume_diff <= 0.)
			conditional_pool_rotate = allow_pool_rotate;
		if (!thr_id && !conditional_state[thr_id] && !opt_quiet)
			applog(LOG_INFO, "network diff too high, waiting...");
		state = false;
	} else if (opt_max_diff > 0. && opt_resume_diff > 0. && conditional_state[thr_id] && net_diff > opt_resume_diff) {
		if (!thr_id && opt_debug)
			applog(LOG_DEBUG, "network diff did not reach resume value %.3f...", opt_resume_diff);
		state = false;
	}
	// Network hashrate
	if (opt_max_rate > 0.0 && net_hashrate > opt_max_rate) {
		int next = pool_get_first_valid(cur_pooln+1);
		if (pools[next].max_rate != pools[cur_pooln].max_rate && opt_resume_rate <= 0.)
			conditional_pool_rotate = allow_pool_rotate;
		if (!thr_id && !conditional_state[thr_id] && !opt_quiet) {
			char rate[32];
			format_hashrate(opt_max_rate, rate);
			applog(LOG_INFO, "network hashrate too high, waiting %s...", rate);
		}
		state = false;
	} else if (opt_max_rate > 0. && opt_resume_rate > 0. && conditional_state[thr_id] && net_hashrate > opt_resume_rate) {
		if (!thr_id && opt_debug)
			applog(LOG_DEBUG, "network rate did not reach resume value %.3f...", opt_resume_rate);
		state = false;
	}
	conditional_state[thr_id] = (uint8_t) !state; // only one wait message in logs
	return state;
}

static void *miner_thread(void *userdata)
{
	struct thr_info *mythr = (struct thr_info *)userdata;
	int switchn = pool_switch_count;
	int thr_id = mythr->id;
	int dev_id = device_map[thr_id % MAX_GPUS];
	struct work work;
	uint64_t loopcnt = 0;
	uint32_t max_nonce;
	uint32_t end_nonce = UINT32_MAX / opt_n_threads * (thr_id + 1) - (thr_id + 1);
	bool work_done = false;
	bool extrajob = false;
	char s[16];
	int rc = 0;

	memset(&work, 0, sizeof(work)); // prevent work from being used uninitialized

	if (opt_priority > 0) {
		int prio = 2; // default to normal
#ifndef WIN32
		prio = 0;
		// note: different behavior on linux (-19 to 19)
		switch (opt_priority) {
			case 0:
				prio = 15;
				break;
			case 1:
				prio = 5;
				break;
			case 2:
				prio = 0; // normal process
				break;
			case 3:
				prio = -1; // above
				break;
			case 4:
				prio = -10;
				break;
			case 5:
				prio = -15;
		}
		if (opt_debug)
			applog(LOG_DEBUG, "Thread %d priority %d (nice %d)",
				thr_id,	opt_priority, prio);
#endif
		setpriority(PRIO_PROCESS, 0, prio);
		drop_policy();
	}

	/* Cpu thread affinity */
	if (num_cpus > 1) {
		if (opt_affinity == -1L && opt_n_threads > 1) {
			if (opt_debug)
				applog(LOG_DEBUG, "Binding thread %d to cpu %d (mask %x)", thr_id,
						thr_id % num_cpus, (1UL << (thr_id % num_cpus)));
			affine_to_cpu_mask(thr_id, 1 << (thr_id % num_cpus));
		} else if (opt_affinity != -1L) {
			if (opt_debug)
				applog(LOG_DEBUG, "Binding thread %d to cpu mask %lx", thr_id,
						(long) opt_affinity);
			affine_to_cpu_mask(thr_id, (unsigned long) opt_affinity);
		}
	}

	gpu_led_off(dev_id);

	while (!abort_flag) {
		struct timeval tv_start, tv_end, diff;
		unsigned long hashes_done;
		uint32_t start_nonce;
		uint32_t scan_time = have_longpoll ? LP_SCANTIME : opt_scantime;
		uint64_t max64, minmax = 0x100000;
		int nodata_check_oft = 0;
		bool regen = false;

		// &work.data[19]
		int wcmplen = (opt_algo == ALGO_DECRED) ? 140 : 76;
		int wcmpoft = 0;

		if (opt_algo == ALGO_LBRY) wcmplen = 108;
		else if (opt_algo == ALGO_SIA) {
			wcmpoft = (32+16)/4;
			wcmplen = 32;
		}

		uint32_t *nonceptr = (uint32_t*) (((char*)work.data) + wcmplen);

		if (have_stratum) {
			uint32_t sleeptime = 0;

			if (opt_algo == ALGO_DECRED)
				work_done = true; // force "regen" hash
			while (!work_done && time(NULL) >= (g_work_time + opt_scantime)) {
				usleep(100*1000);
				if (sleeptime > 4) {
					extrajob = true;
					break;
				}
				sleeptime++;
			}
			if (sleeptime && opt_debug && !opt_quiet)
				applog(LOG_DEBUG, "sleeptime: %u ms", sleeptime*100);
			nonceptr = (uint32_t*) (((char*)work.data) + wcmplen);
			pthread_mutex_lock(&g_work_lock);
			extrajob |= work_done;

			regen = (nonceptr[0] >= end_nonce);
			if (opt_algo == ALGO_SIA) {
				regen = ((nonceptr[1] & 0xFF00) >= 0xF000);
			}
			regen = regen || extrajob;

			if (regen) {
				work_done = false;
				extrajob = false;
				if (stratum_gen_work(&stratum, &g_work))
					g_work_time = time(NULL);
			}
		} else {
			uint32_t secs = 0;
			pthread_mutex_lock(&g_work_lock);
			secs = (uint32_t) (time(NULL) - g_work_time);
			if (secs >= scan_time || nonceptr[0] >= (end_nonce - 0x100)) {
				if (opt_debug && g_work_time && !opt_quiet)
					applog(LOG_DEBUG, "work time %u/%us nonce %x/%x", secs, scan_time, nonceptr[0], end_nonce);
				/* obtain new work from internal workio thread */
				if (unlikely(!get_work(mythr, &g_work))) {
					pthread_mutex_unlock(&g_work_lock);
					if (switchn != pool_switch_count) {
						switchn = pool_switch_count;
						continue;
					} else {
						applog(LOG_ERR, "work retrieval failed, exiting mining thread %d", mythr->id);
						goto out;
					}
				}
				g_work_time = time(NULL);
			}
		}

		if (!opt_benchmark && (g_work.height != work.height || memcmp(work.target, g_work.target, sizeof(work.target))))
		{
			if (opt_debug) {
				uint64_t target64 = g_work.target[7] * 0x100000000ULL + g_work.target[6];
				applog(LOG_DEBUG, "job %s target change: %llx (%.1f)", g_work.job_id, target64, g_work.targetdiff);
			}
			memcpy(work.target, g_work.target, sizeof(work.target));
			work.targetdiff = g_work.targetdiff;
			work.height = g_work.height;
			//nonceptr[0] = (UINT32_MAX / opt_n_threads) * thr_id; // 0 if single thr
		}

		if (opt_algo == ALGO_ZR5) {
			// ignore pok/version header
			wcmpoft = 1;
			wcmplen -= 4;
		}

		if (memcmp(&work.data[wcmpoft], &g_work.data[wcmpoft], wcmplen)) {
			#if 0
			if (opt_debug) {
				for (int n=0; n <= (wcmplen-8); n+=8) {
					if (memcmp(work.data + n, g_work.data + n, 8)) {
						applog(LOG_DEBUG, "job %s work updated at offset %d:", g_work.job_id, n);
						applog_hash((uchar*) &work.data[n]);
						applog_compare_hash((uchar*) &g_work.data[n], (uchar*) &work.data[n]);
					}
				}
			}
			#endif
			memcpy(&work, &g_work, sizeof(struct work));
			nonceptr[0] = (UINT32_MAX / opt_n_threads) * thr_id; // 0 if single thr
		} else
			nonceptr[0]++; //??

		if (opt_algo == ALGO_DECRED) {
			// suprnova job_id check without data/target/height change...
			if (check_stratum_jobs && strcmp(work.job_id, g_work.job_id)) {
				pthread_mutex_unlock(&g_work_lock);
				continue;
			}

			// use the full range per loop
			nonceptr[0] = 0;
			end_nonce = UINT32_MAX;
			// and make an unique work (extradata)
			nonceptr[1] += 1;
			nonceptr[2] |= thr_id;

		} else if (opt_algo == ALGO_SIA) {
			// suprnova job_id check without data/target/height change...
			if (have_stratum && strcmp(work.job_id, g_work.job_id)) {
				pthread_mutex_unlock(&g_work_lock);
				work_done = true;
				continue;
			}
			nonceptr[1] += opt_n_threads;
			nonceptr[1] |= thr_id;
			// range max
			nonceptr[0] = 0;
			end_nonce = UINT32_MAX;
		} else if (opt_benchmark) {
			// randomize work
			nonceptr[-1] += 1;
		}

		pthread_mutex_unlock(&g_work_lock);

		// --benchmark [-a all]
		if (opt_benchmark && bench_algo >= 0) {
			//gpulog(LOG_DEBUG, thr_id, "loop %d", loopcnt);
			if (loopcnt >= 3) {
				if (!bench_algo_switch_next(thr_id) && thr_id == 0)
				{
					bench_display_results();
					proper_exit(0);
					break;
				}
				loopcnt = 0;
			}
		}
		loopcnt++;

		// prevent gpu scans before a job is received
		if (opt_algo == ALGO_SIA) nodata_check_oft = 7; // no stratum version
		else if (opt_algo == ALGO_DECRED) nodata_check_oft = 4; // testnet ver is 0
		else nodata_check_oft = 0;
		if (have_stratum && work.data[nodata_check_oft] == 0 && !opt_benchmark) {
			sleep(1);
			if (!thr_id) pools[cur_pooln].wait_time += 1;
			gpulog(LOG_DEBUG, thr_id, "no data");
			continue;
		}

		/* conditional mining */
		if (!wanna_mine(thr_id)) {

			// free gpu resources
			algo_free_all(thr_id);
			// clear any free error (algo switch)
			cuda_clear_lasterror();

			// conditional pool switch
			if (num_pools > 1 && conditional_pool_rotate) {
				if (!pool_is_switching)
					pool_switch_next(thr_id);
				else if (time(NULL) - firstwork_time > 35) {
					if (!opt_quiet)
						applog(LOG_WARNING, "Pool switching timed out...");
					if (!thr_id) pools[cur_pooln].wait_time += 1;
					pool_is_switching = false;
				}
				sleep(1);
				continue;
			}

			pool_on_hold = true;
			global_hashrate = 0;
			sleep(5);
			if (!thr_id) pools[cur_pooln].wait_time += 5;
			continue;
		}
		pool_on_hold = false;

		work_restart[thr_id].restart = 0;

		/* adjust max_nonce to meet target scan time */
		if (have_stratum)
			max64 = LP_SCANTIME;
		else
			max64 = max(1, (int64_t) scan_time + g_work_time - time(NULL));

		/* time limit */
		if (opt_time_limit > 0 && firstwork_time) {
			int passed = (int)(time(NULL) - firstwork_time);
			int remain = (int)(opt_time_limit - passed);
			if (remain < 0)  {
				if (thr_id != 0) {
					sleep(1); continue;
				}
				if (num_pools > 1 && pools[cur_pooln].time_limit > 0) {
					if (!pool_is_switching) {
						if (!opt_quiet)
							applog(LOG_INFO, "Pool mining timeout of %ds reached, rotate...", opt_time_limit);
						pool_switch_next(thr_id);
					} else if (passed > 35) {
						// ensure we dont stay locked if pool_is_switching is not reset...
						applog(LOG_WARNING, "Pool switch to %d timed out...", cur_pooln);
						if (!thr_id) pools[cur_pooln].wait_time += 1;
						pool_is_switching = false;
					}
					sleep(1);
					continue;
				}
				app_exit_code = EXIT_CODE_TIME_LIMIT;
				abort_flag = true;
				if (opt_benchmark) {
					char rate[32];
					format_hashrate((double)global_hashrate, rate);
					applog(LOG_NOTICE, "Benchmark: %s", rate);
					usleep(200*1000);
					fprintf(stderr, "%llu\n", (long long unsigned int) global_hashrate);
				} else {
					applog(LOG_NOTICE, "Mining timeout of %ds reached, exiting...", opt_time_limit);
				}
				workio_abort();
				break;
			}
			if (remain < max64) max64 = remain;
		}

		/* shares limit */
		if (opt_shares_limit > 0 && firstwork_time) {
			int64_t shares = (pools[cur_pooln].accepted_count + pools[cur_pooln].rejected_count);
			if (shares >= opt_shares_limit) {
				int passed = (int)(time(NULL) - firstwork_time);
				if (thr_id != 0) {
					sleep(1); continue;
				}
				if (num_pools > 1 && pools[cur_pooln].shares_limit > 0) {
					if (!pool_is_switching) {
						if (!opt_quiet)
							applog(LOG_INFO, "Pool shares limit of %d reached, rotate...", opt_shares_limit);
						pool_switch_next(thr_id);
					} else if (passed > 35) {
						// ensure we dont stay locked if pool_is_switching is not reset...
						applog(LOG_WARNING, "Pool switch to %d timed out...", cur_pooln);
						if (!thr_id) pools[cur_pooln].wait_time += 1;
						pool_is_switching = false;
					}
					sleep(1);
					continue;
				}
				abort_flag = true;
				app_exit_code = EXIT_CODE_OK;
				applog(LOG_NOTICE, "Mining limit of %d shares reached, exiting...", opt_shares_limit);
				workio_abort();
				break;
			}
		}

		max64 *= (uint32_t)thr_hashrates[thr_id];

		/* on start, max64 should not be 0,
		 *    before hashrate is computed */
		if (max64 < minmax) {
			switch (opt_algo) {
			case ALGO_BLAKECOIN:
			case ALGO_BLAKE2S:
			case ALGO_VANILLA:
				minmax = 0x80000000U;
				break;
			case ALGO_BLAKE:
			case ALGO_BMW:
			case ALGO_DECRED:
			//case ALGO_WHIRLPOOLX:
				minmax = 0x40000000U;
				break;
			case ALGO_KECCAK:
			case ALGO_LBRY:
			case ALGO_LUFFA:
			case ALGO_SIA:
			case ALGO_SKEIN:
			case ALGO_SKEIN2:
				minmax = 0x1000000;
				break;
			case ALGO_C11:
			case ALGO_DEEP:
			case ALGO_HEAVY:
			case ALGO_LYRA2v2:
			case ALGO_S3:
			case ALGO_X11EVO:
			case ALGO_X11:
			case ALGO_X13:
			case ALGO_WHIRLCOIN:
			case ALGO_WHIRLPOOL:
				minmax = 0x400000;
				break;
			case ALGO_JACKPOT:
			case ALGO_X14:
			case ALGO_X15:
				minmax = 0x300000;
				break;
			case ALGO_LYRA2:
			case ALGO_NEOSCRYPT:
			case ALGO_SIB:
			case ALGO_SCRYPT:
			case ALGO_VELTOR:
				minmax = 0x80000;
				break;
			case ALGO_SCRYPT_JANE:
				minmax = 0x1000;
				break;
			}
			max64 = max(minmax-1, max64);
		}

		// we can't scan more than uint32 capacity
		max64 = min(UINT32_MAX, max64);

		start_nonce = nonceptr[0];

		/* never let small ranges at end */
		if (end_nonce >= UINT32_MAX - 256)
			end_nonce = UINT32_MAX;

		if ((max64 + start_nonce) >= end_nonce)
			max_nonce = end_nonce;
		else
			max_nonce = (uint32_t) (max64 + start_nonce);

		// todo: keep it rounded to a multiple of 256 ?

		if (unlikely(start_nonce > max_nonce)) {
			// should not happen but seen in skein2 benchmark with 2 gpus
			max_nonce = end_nonce = UINT32_MAX;
		}

		work.scanned_from = start_nonce;

		gpulog(LOG_DEBUG, thr_id, "start=%08x end=%08x range=%08x",
			start_nonce, max_nonce, (max_nonce-start_nonce));

		if (opt_led_mode == LED_MODE_MINING)
			gpu_led_on(dev_id);

		hashes_done = 0;
		gettimeofday(&tv_start, NULL);

		// check (and reset) previous errors
		cudaError_t err = cudaGetLastError();
		if (err != cudaSuccess && !opt_quiet)
			gpulog(LOG_WARNING, thr_id, "%s", cudaGetErrorString(err));

		/* scan nonces for a proof-of-work hash */
		switch (opt_algo) {

		case ALGO_BLAKECOIN:
			rc = scanhash_blake256(thr_id, &work, max_nonce, &hashes_done, 8);
			break;
		case ALGO_BLAKE:
			rc = scanhash_blake256(thr_id, &work, max_nonce, &hashes_done, 14);
			break;
		case ALGO_BLAKE2S:
			rc = scanhash_blake2s(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_BMW:
			rc = scanhash_bmw(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_C11:
			rc = scanhash_c11(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_DECRED:
			//applog(LOG_BLUE, "version %x, nbits %x, ntime %x extra %x",
			//	work.data[0], work.data[29], work.data[34], work.data[38]);
			rc = scanhash_decred(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_DEEP:
			rc = scanhash_deep(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_FRESH:
			rc = scanhash_fresh(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_FUGUE256:
			rc = scanhash_fugue256(thr_id, &work, max_nonce, &hashes_done);
			break;

		case ALGO_GROESTL:
		case ALGO_DMD_GR:
			rc = scanhash_groestlcoin(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_MYR_GR:
			rc = scanhash_myriad(thr_id, &work, max_nonce, &hashes_done);
			break;

		case ALGO_HEAVY:
			rc = scanhash_heavy(thr_id, &work, max_nonce, &hashes_done, work.maxvote, HEAVYCOIN_BLKHDR_SZ);
			break;
		case ALGO_MJOLLNIR:
			rc = scanhash_heavy(thr_id, &work, max_nonce, &hashes_done, 0, MNR_BLKHDR_SZ);
			break;
		case ALGO_KECCAK:
			rc = scanhash_keccak256(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_JACKPOT:
			rc = scanhash_jackpot(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_LBRY:
			rc = scanhash_lbry(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_LUFFA:
			rc = scanhash_luffa(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_QUARK:
			rc = scanhash_quark(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_QUBIT:
			rc = scanhash_qubit(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_LYRA2:
			rc = scanhash_lyra2(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_LYRA2v2:
			rc = scanhash_lyra2v2(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_NEOSCRYPT:
			rc = scanhash_neoscrypt(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_NIST5:
			rc = scanhash_nist5(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_PENTABLAKE:
			rc = scanhash_pentablake(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_SCRYPT:
			rc = scanhash_scrypt(thr_id, &work, max_nonce, &hashes_done,
				NULL, &tv_start, &tv_end);
			break;
		case ALGO_SCRYPT_JANE:
			rc = scanhash_scrypt_jane(thr_id, &work, max_nonce, &hashes_done,
				NULL, &tv_start, &tv_end);
			break;
		case ALGO_SKEIN:
			rc = scanhash_skeincoin(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_SKEIN2:
			rc = scanhash_skein2(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_SIA:
			rc = scanhash_sia(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_SIB:
			rc = scanhash_sib(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_S3:
			rc = scanhash_s3(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_VANILLA:
			rc = scanhash_vanilla(thr_id, &work, max_nonce, &hashes_done, 8);
			break;
		case ALGO_VELTOR:
			rc = scanhash_veltor(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_WHIRLCOIN:
		case ALGO_WHIRLPOOL:
			rc = scanhash_whirl(thr_id, &work, max_nonce, &hashes_done);
			break;
		//case ALGO_WHIRLPOOLX:
		//	rc = scanhash_whirlx(thr_id, &work, max_nonce, &hashes_done);
		//	break;
		case ALGO_X11EVO:
			rc = scanhash_x11evo(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_X11:
			rc = scanhash_x11(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_X13:
			rc = scanhash_x13(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_X14:
			rc = scanhash_x14(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_X15:
			rc = scanhash_x15(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_X17:
			rc = scanhash_x17(thr_id, &work, max_nonce, &hashes_done);
			break;
		case ALGO_ZR5:
			rc = scanhash_zr5(thr_id, &work, max_nonce, &hashes_done);
			break;

		default:
			/* should never happen */
			goto out;
		}

		if (opt_led_mode == LED_MODE_MINING)
			gpu_led_off(dev_id);

		if (abort_flag)
			break; // time to leave the mining loop...

		if (work_restart[thr_id].restart)
			continue;

		/* record scanhash elapsed time */
		gettimeofday(&tv_end, NULL);

		// todo: update all algos to use work->nonces
		if (opt_algo != ALGO_SIA) // reversed endian
			work.nonces[0] = nonceptr[0];
		if (opt_algo != ALGO_DECRED && opt_algo != ALGO_BLAKE2S && opt_algo != ALGO_LBRY && opt_algo != ALGO_SIA) {
			if (opt_algo != ALGO_VELTOR)
			work.nonces[1] = nonceptr[2];
		}

		if (rc > 0 && opt_debug)
			applog(LOG_NOTICE, CL_CYN "found => %08x" CL_GRN " %08x", work.nonces[0], swab32(work.nonces[0]));
		if (rc > 1 && opt_debug)
			applog(LOG_NOTICE, CL_CYN "found => %08x" CL_GRN " %08x", work.nonces[1], swab32(work.nonces[1]));

		timeval_subtract(&diff, &tv_end, &tv_start);

		if (diff.tv_usec || diff.tv_sec) {
			double dtime = (double) diff.tv_sec + 1e-6 * diff.tv_usec;

			/* hashrate factors for some algos */
			double rate_factor = 1.0;
			switch (opt_algo) {
				case ALGO_JACKPOT:
				case ALGO_QUARK:
					// to stay comparable to other ccminer forks or pools
					rate_factor = 0.5;
					break;
			}

			/* store thread hashrate */
			if (dtime > 0.0) {
				pthread_mutex_lock(&stats_lock);
				thr_hashrates[thr_id] = hashes_done / dtime;
				thr_hashrates[thr_id] *= rate_factor;
				if (loopcnt > 1) // ignore first (init time)
					stats_remember_speed(thr_id, hashes_done, thr_hashrates[thr_id], (uint8_t) rc, work.height);
				pthread_mutex_unlock(&stats_lock);
			}
		}

		if (rc > 0)
			work.scanned_to = work.nonces[0];
		if (rc > 1)
			work.scanned_to = max(work.nonces[0], work.nonces[1]);
		else {
			work.scanned_to = max_nonce;
			if (opt_debug && opt_benchmark) {
				// to debug nonce ranges
				gpulog(LOG_DEBUG, thr_id, "ends=%08x range=%08x", nonceptr[0], (nonceptr[0] - start_nonce));
			}
			// prevent low scan ranges on next loop on fast algos (blake)
			if (nonceptr[0] > UINT32_MAX - 64)
				nonceptr[0] = UINT32_MAX;
		}

		if (check_dups && opt_algo != ALGO_DECRED && opt_algo != ALGO_SIA)
			hashlog_remember_scan_range(&work);

		/* output */
		if (!opt_quiet && loopcnt > 1) {
			format_hashrate(thr_hashrates[thr_id], s);
			gpulog(LOG_INFO, thr_id, "%s, %s", device_name[dev_id], s);
		}

		/* ignore first loop hashrate */
		if (firstwork_time && thr_id == (opt_n_threads - 1)) {
			double hashrate = 0.;
			pthread_mutex_lock(&stats_lock);
			for (int i = 0; i < opt_n_threads && thr_hashrates[i]; i++)
				hashrate += stats_get_speed(i, thr_hashrates[i]);
			pthread_mutex_unlock(&stats_lock);
			if (opt_benchmark && bench_algo == -1 && loopcnt > 2) {
				format_hashrate(hashrate, s);
				applog(LOG_NOTICE, "Total: %s", s);
			}

			// since pool start
			pools[cur_pooln].work_time = (uint32_t) (time(NULL) - firstwork_time);

			// X-Mining-Hashrate
			global_hashrate = llround(hashrate);
		}

		if (firstwork_time == 0)
			firstwork_time = time(NULL);

		/* if nonce found, submit work */
		if (rc > 0 && !opt_benchmark) {
			uint32_t curnonce = nonceptr[0]; // current scan position

			if (opt_led_mode == LED_MODE_SHARES)
				gpu_led_percent(dev_id, 50);

			nonceptr[0] = work.nonces[0];
			if (!submit_work(mythr, &work))
				break;
			nonceptr[0] = curnonce;

			// prevent stale work in solo
			// we can't submit twice a block!
			if (!have_stratum && !have_longpoll) {
				pthread_mutex_lock(&g_work_lock);
				// will force getwork
				g_work_time = 0;
				pthread_mutex_unlock(&g_work_lock);
				continue;
			}

			// second nonce found, submit too (on pool only!)
			if (rc > 1 && work.nonces[1]) {
				nonceptr[0] = work.nonces[1];
				if (opt_algo == ALGO_ZR5) {
					// todo: use + 4..6 index for pok to allow multiple nonces
					work.data[0] = work.data[22]; // pok
					work.data[22] = 0;
				}
				if (!submit_work(mythr, &work))
					break;
				nonceptr[0] = curnonce;
			}
		}
	}

out:
	if (opt_led_mode)
		gpu_led_off(dev_id);
	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() died", __func__);
	tq_freeze(mythr->q);
	return NULL;
}

static void *longpoll_thread(void *userdata)
{
	struct thr_info *mythr = (struct thr_info *)userdata;
	struct pool_infos *pool;
	CURL *curl = NULL;
	char *hdr_path = NULL, *lp_url = NULL;
	const char *rpc_req = json_rpc_getwork;
	bool need_slash = false;
	int pooln, switchn;

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "%s() CURL init failed", __func__);
		goto out;
	}

wait_lp_url:
	hdr_path = (char*)tq_pop(mythr->q, NULL); // wait /LP url
	if (!hdr_path)
		goto out;

	if (!(pools[cur_pooln].type & POOL_STRATUM)) {
		pooln = cur_pooln;
		pool = &pools[pooln];
	} else {
		// hack...
		have_stratum = true;
	}

	// to detect pool switch during loop
	switchn = pool_switch_count;

	if (opt_algo == ALGO_SIA) {
		goto out;
	}

	/* full URL */
	else if (strstr(hdr_path, "://")) {
		lp_url = hdr_path;
		hdr_path = NULL;
	}
	/* absolute path, on current server */
	else {
		char *copy_start = (*hdr_path == '/') ? (hdr_path + 1) : hdr_path;
		if (rpc_url[strlen(rpc_url) - 1] != '/')
			need_slash = true;

		lp_url = (char*)malloc(strlen(rpc_url) + strlen(copy_start) + 2);
		if (!lp_url)
			goto out;

		sprintf(lp_url, "%s%s%s", rpc_url, need_slash ? "/" : "", copy_start);
	}

	if (!pool_is_switching)
		applog(LOG_BLUE, "Long-polling on %s", lp_url);

	pool_is_switching = false;

	pool->type |= POOL_LONGPOLL;

longpoll_retry:

	while (!abort_flag) {
		json_t *val = NULL, *soval;
		int err = 0;

		if (opt_debug_threads)
			applog(LOG_DEBUG, "longpoll %d: %d count %d %d, switching=%d, have_stratum=%d",
				pooln, cur_pooln, switchn, pool_switch_count, pool_is_switching, have_stratum);

		// exit on pool switch
		if (switchn != pool_switch_count)
			goto need_reinit;

		if (opt_algo == ALGO_SIA) {
			char *sia_header = sia_getheader(curl, pool);
			if (sia_header) {
				pthread_mutex_lock(&g_work_lock);
				if (sia_work_decode(sia_header, &g_work)) {
					g_work_time = time(NULL);
				}
				free(sia_header);
				pthread_mutex_unlock(&g_work_lock);
			}
			continue;
		}

		val = json_rpc_longpoll(curl, lp_url, pool, rpc_req, &err);
		if (have_stratum || switchn != pool_switch_count) {
			if (val)
				json_decref(val);
			goto need_reinit;
		}
		if (likely(val)) {
			soval = json_object_get(json_object_get(val, "result"), "submitold");
			submit_old = soval ? json_is_true(soval) : false;
			pthread_mutex_lock(&g_work_lock);
			if (work_decode(json_object_get(val, "result"), &g_work)) {
				restart_threads();
				if (!opt_quiet) {
					char netinfo[64] = { 0 };
					if (net_diff > 0.) {
						sprintf(netinfo, ", diff %.3f", net_diff);
					}
					if (opt_showdiff) {
						sprintf(&netinfo[strlen(netinfo)], ", target %.3f", g_work.targetdiff);
					}
					if (g_work.height)
						applog(LOG_BLUE, "%s block %u%s", algo_names[opt_algo], g_work.height, netinfo);
					else
						applog(LOG_BLUE, "%s detected new block%s", short_url, netinfo);
				}
				g_work_time = time(NULL);
			}
			pthread_mutex_unlock(&g_work_lock);
			json_decref(val);
		} else {
			// to check...
			g_work_time = 0;
			if (err != CURLE_OPERATION_TIMEDOUT) {
				if (opt_debug_threads) applog(LOG_DEBUG, "%s() err %d, retry in %s seconds",
					__func__, err, opt_fail_pause);
				sleep(opt_fail_pause);
				goto longpoll_retry;
			}
		}
	}

out:
	have_longpoll = false;
	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() died", __func__);

	free(hdr_path);
	free(lp_url);
	tq_freeze(mythr->q);
	if (curl)
		curl_easy_cleanup(curl);

	return NULL;

need_reinit:
	/* this thread should not die to allow pool switch */
	have_longpoll = false;
	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() reinit...", __func__);
	if (hdr_path) free(hdr_path); hdr_path = NULL;
	if (lp_url) free(lp_url); lp_url = NULL;
	goto wait_lp_url;
}

static bool stratum_handle_response(char *buf)
{
	json_t *val, *err_val, *res_val, *id_val;
	json_error_t err;
	struct timeval tv_answer, diff;
	bool ret = false;

	val = JSON_LOADS(buf, &err);
	if (!val) {
		applog(LOG_INFO, "JSON decode failed(%d): %s", err.line, err.text);
		goto out;
	}

	res_val = json_object_get(val, "result");
	err_val = json_object_get(val, "error");
	id_val = json_object_get(val, "id");

	if (!id_val || json_is_null(id_val) || !res_val)
		goto out;

	// ignore subscribe late answer (yaamp)
	if (json_integer_value(id_val) < 4)
		goto out;

	gettimeofday(&tv_answer, NULL);
	timeval_subtract(&diff, &tv_answer, &stratum.tv_submit);
	// store time required to the pool to answer to a submit
	stratum.answer_msec = (1000 * diff.tv_sec) + (uint32_t) (0.001 * diff.tv_usec);

	share_result(json_is_true(res_val), stratum.pooln, stratum.sharediff,
		err_val ? json_string_value(json_array_get(err_val, 1)) : NULL);

	ret = true;
out:
	if (val)
		json_decref(val);

	return ret;
}

static void *stratum_thread(void *userdata)
{
	struct thr_info *mythr = (struct thr_info *)userdata;
	struct pool_infos *pool;
	stratum_ctx *ctx = &stratum;
	int pooln, switchn;
	char *s;

wait_stratum_url:
	stratum.url = (char*)tq_pop(mythr->q, NULL);
	if (!stratum.url)
		goto out;

	if (!pool_is_switching)
		applog(LOG_BLUE, "Starting on %s", stratum.url);

	ctx->pooln = pooln = cur_pooln;
	switchn = pool_switch_count;
	pool = &pools[pooln];

	pool_is_switching = false;
	stratum_need_reset = false;

	while (!abort_flag) {
		int failures = 0;

		if (stratum_need_reset) {
			stratum_need_reset = false;
			if (stratum.url)
				stratum_disconnect(&stratum);
			else
				stratum.url = strdup(pool->url); // may be useless
		}

		while (!stratum.curl && !abort_flag) {
			pthread_mutex_lock(&g_work_lock);
			g_work_time = 0;
			g_work.data[0] = 0;
			pthread_mutex_unlock(&g_work_lock);
			restart_threads();

			if (!stratum_connect(&stratum, pool->url) ||
			    !stratum_subscribe(&stratum) ||
			    !stratum_authorize(&stratum, pool->user, pool->pass))
			{
				stratum_disconnect(&stratum);
				if (opt_retries >= 0 && ++failures > opt_retries) {
					if (num_pools > 1 && opt_pool_failover) {
						applog(LOG_WARNING, "Stratum connect timeout, failover...");
						pool_switch_next(-1);
					} else {
						applog(LOG_ERR, "...terminating workio thread");
						//tq_push(thr_info[work_thr_id].q, NULL);
						workio_abort();
						proper_exit(EXIT_CODE_POOL_TIMEOUT);
						goto out;
					}
				}
				if (switchn != pool_switch_count)
					goto pool_switched;
				if (!opt_benchmark)
					applog(LOG_ERR, "...retry after %d seconds", opt_fail_pause);
				sleep(opt_fail_pause);
			}
		}

		if (switchn != pool_switch_count) goto pool_switched;

		if (stratum.job.job_id &&
		    (!g_work_time || strncmp(stratum.job.job_id, g_work.job_id + 8, sizeof(g_work.job_id)-8))) {
			pthread_mutex_lock(&g_work_lock);
			if (stratum_gen_work(&stratum, &g_work))
				g_work_time = time(NULL);
			if (stratum.job.clean) {
				static uint32_t last_bloc_height;
				if (!opt_quiet && stratum.job.height != last_bloc_height) {
					last_bloc_height = stratum.job.height;
					if (net_diff > 0.)
						applog(LOG_BLUE, "%s block %d, diff %.3f", algo_names[opt_algo],
							stratum.job.height, net_diff);
					else
						applog(LOG_BLUE, "%s %s block %d", pool->short_url, algo_names[opt_algo],
							stratum.job.height);
				}
				restart_threads();
				if (check_dups)
					hashlog_purge_old();
				stats_purge_old();
			} else if (opt_debug && !opt_quiet) {
					applog(LOG_BLUE, "%s asks job %d for block %d", pool->short_url,
						strtoul(stratum.job.job_id, NULL, 16), stratum.job.height);
			}
			pthread_mutex_unlock(&g_work_lock);
		}
		
		// check we are on the right pool
		if (switchn != pool_switch_count) goto pool_switched;

		if (!stratum_socket_full(&stratum, opt_timeout)) {
			if (opt_debug)
				applog(LOG_WARNING, "Stratum connection timed out");
			s = NULL;
		} else
			s = stratum_recv_line(&stratum);

		// double check we are on the right pool
		if (switchn != pool_switch_count) goto pool_switched;

		if (!s) {
			stratum_disconnect(&stratum);
			if (!opt_quiet && !pool_on_hold)
				applog(LOG_WARNING, "Stratum connection interrupted");
			continue;
		}
		if (!stratum_handle_method(&stratum, s))
			stratum_handle_response(s);
		free(s);
	}

out:
	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() died", __func__);

	return NULL;

pool_switched:
	/* this thread should not die on pool switch */
	stratum_disconnect(&(pools[pooln].stratum));
	if (stratum.url) free(stratum.url); stratum.url = NULL;
	if (opt_debug_threads)
		applog(LOG_DEBUG, "%s() reinit...", __func__);
	goto wait_stratum_url;
}

static void show_version_and_exit(void)
{
	printf("%s v%s\n"
#ifdef WIN32
		"pthreads static %s\n"
#endif
		"%s\n",
		PACKAGE_NAME, PACKAGE_VERSION,
#ifdef WIN32
		PTW32_VERSION_STRING,
#endif
		curl_version());
	proper_exit(EXIT_CODE_OK);
}

static void show_usage_and_exit(int status)
{
	if (status)
		fprintf(stderr, "Try `" PROGRAM_NAME " --help' for more information.\n");
	else
		printf(usage);
	if (opt_algo == ALGO_SCRYPT || opt_algo == ALGO_SCRYPT_JANE) {
		printf(scrypt_usage);
	}
	proper_exit(status);
}

void parse_arg(int key, char *arg)
{
	char *p = arg;
	int v, i;
	uint64_t ul;
	double d;

	switch(key) {
	case 'a': /* --algo */
		p = strstr(arg, ":"); // optional factor
		if (p) *p = '\0';

		i = algo_to_int(arg);
		if (i >= 0)
			opt_algo = (enum sha_algos)i;
		else {
			applog(LOG_ERR, "Unknown algo parameter '%s'", arg);
			show_usage_and_exit(1);
		}

		if (p) {
			opt_nfactor = atoi(p + 1);
			if (opt_algo == ALGO_SCRYPT_JANE) {
				free(jane_params);
				jane_params = strdup(p+1);
			}
		}
		if (!opt_nfactor) {
			switch (opt_algo) {
			case ALGO_SCRYPT:      opt_nfactor = 9;  break;
			case ALGO_SCRYPT_JANE: opt_nfactor = 14; break;
			}
		}
		break;
	case 'b':
		p = strstr(arg, ":");
		if (p) {
			/* ip:port */
			if (p - arg > 0) {
				free(opt_api_allow);
				opt_api_allow = strdup(arg);
				opt_api_allow[p - arg] = '\0';
			}
			opt_api_listen = atoi(p + 1);
		}
		else if (arg && strstr(arg, ".")) {
			/* ip only */
			free(opt_api_allow);
			opt_api_allow = strdup(arg);
		}
		else if (arg) {
			/* port or 0 to disable */
			opt_api_listen = atoi(arg);
		}
		break;
	case 1030: /* --api-remote */
		opt_api_remote = 1;
		break;
	case 'B':
		opt_background = true;
		break;
	case 'c': {
		json_error_t err;
		if (opt_config) {
			json_decref(opt_config);
			opt_config = NULL;
		}
		if (arg && strstr(arg, "://")) {
			opt_config = json_load_url(arg, &err);
		} else {
			opt_config = JSON_LOADF(arg, &err);
		}
		if (!json_is_object(opt_config)) {
			applog(LOG_ERR, "JSON decode of %s failed", arg);
			proper_exit(EXIT_CODE_USAGE);
		}
		break;
	}
	case 'i':
		d = atof(arg);
		v = (uint32_t) d;
		if (v < 0 || v > 31)
			show_usage_and_exit(1);
		{
			int n = 0;
			int ngpus = cuda_num_devices();
			uint32_t last = 0;
			char * pch = strtok(arg,",");
			while (pch != NULL) {
				d = atof(pch);
				v = (uint32_t) d;
				if (v > 7) { /* 0 = default */
					if ((d - v) > 0.0) {
						uint32_t adds = (uint32_t)floor((d - v) * (1 << (v - 8))) * 256;
						gpus_intensity[n] = (1 << v) + adds;
						applog(LOG_INFO, "Adding %u threads to intensity %u, %u cuda threads",
							adds, v, gpus_intensity[n]);
					}
					else if (gpus_intensity[n] != (1 << v)) {
						gpus_intensity[n] = (1 << v);
						applog(LOG_INFO, "Intensity set to %u, %u cuda threads",
							v, gpus_intensity[n]);
					}
				}
				last = gpus_intensity[n];
				n++;
				pch = strtok(NULL, ",");
			}
			while (n < MAX_GPUS)
				gpus_intensity[n++] = last;
		}
		break;
	case 'D':
		opt_debug = true;
		break;
	case 'N':
		v = atoi(arg);
		if (v < 1)
			opt_statsavg = INT_MAX;
		opt_statsavg = v;
		break;
	case 'n': /* --ndevs */
		// to get gpu vendors...
		#ifdef USE_WRAPNVML
		hnvml = nvml_create();
		#ifdef WIN32
		nvapi_init();
		cuda_devicenames(); // req for leds
		nvapi_init_settings();
		#endif
		#endif
		cuda_print_devices();
		proper_exit(EXIT_CODE_OK);
		break;
	case 'q':
		opt_quiet = true;
		break;
	case 'p':
		free(rpc_pass);
		rpc_pass = strdup(arg);
		pool_set_creds(cur_pooln);
		break;
	case 'P':
		opt_protocol = true;
		break;
	case 'r':
		v = atoi(arg);
		if (v < -1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);
		opt_retries = v;
		break;
	case 'R':
		v = atoi(arg);
		if (v < 1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);
		opt_fail_pause = v;
		break;
	case 's':
		v = atoi(arg);
		if (v < 1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);
		opt_scantime = v;
		break;
	case 'T':
		v = atoi(arg);
		if (v < 1 || v > 99999)	/* sanity check */
			show_usage_and_exit(1);
		opt_timeout = v;
		break;
	case 't':
		v = atoi(arg);
		if (v < 0 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);
		opt_n_threads = v;
		break;
	case 1022: // --vote
		v = atoi(arg);
		if (v < 0 || v > 8192)	/* sanity check */
			show_usage_and_exit(1);
		opt_vote = (uint16_t)v;
		break;
	case 1023: // --trust-pool
		opt_trust_pool = true;
		break;
	case 'u':
		free(rpc_user);
		rpc_user = strdup(arg);
		pool_set_creds(cur_pooln);
		break;
	case 'o':			/* --url */
		if (pools[cur_pooln].type != POOL_UNUSED) {
			// rotate pool pointer
			cur_pooln = (cur_pooln + 1) % MAX_POOLS;
			num_pools = max(cur_pooln+1, num_pools);
			// change some defaults if multi pools
			if (opt_retries == -1) opt_retries = 1;
			if (opt_fail_pause == 30) opt_fail_pause = 5;
			if (opt_timeout == 300) opt_timeout = 60;
		}
		p = strstr(arg, "://");
		if (p) {
			if (strncasecmp(arg, "http://", 7) && strncasecmp(arg, "https://", 8) &&
					strncasecmp(arg, "stratum+tcp://", 14))
				show_usage_and_exit(1);
			free(rpc_url);
			rpc_url = strdup(arg);
			short_url = &rpc_url[(p - arg) + 3];
		} else {
			if (!strlen(arg) || *arg == '/')
				show_usage_and_exit(1);
			free(rpc_url);
			rpc_url = (char*)malloc(strlen(arg) + 8);
			sprintf(rpc_url, "http://%s", arg);
			short_url = &rpc_url[7];
		}
		p = strrchr(rpc_url, '@');
		if (p) {
			char *sp, *ap;
			*p = '\0';
			ap = strstr(rpc_url, "://") + 3;
			sp = strchr(ap, ':');
			if (sp && sp < p) {
				free(rpc_user);
				rpc_user = (char*)calloc(sp - ap + 1, 1);
				strncpy(rpc_user, ap, sp - ap);
				free(rpc_pass);
				rpc_pass = strdup(sp + 1);
			} else {
				free(rpc_user);
				rpc_user = strdup(ap);
			}
			// remove user[:pass]@ from rpc_url
			memmove(ap, p + 1, strlen(p + 1) + 1);
			// host:port only
			short_url = ap;
		}
		have_stratum = !opt_benchmark && !strncasecmp(rpc_url, "stratum", 7);
		pool_set_creds(cur_pooln);
		break;
	case 'O':			/* --userpass */
		p = strchr(arg, ':');
		if (!p)
			show_usage_and_exit(1);
		free(rpc_user);
		rpc_user = (char*)calloc(p - arg + 1, 1);
		strncpy(rpc_user, arg, p - arg);
		free(rpc_pass);
		rpc_pass = strdup(p + 1);
		pool_set_creds(cur_pooln);
		break;
	case 'x':			/* --proxy */
		if (!strncasecmp(arg, "socks4://", 9))
			opt_proxy_type = CURLPROXY_SOCKS4;
		else if (!strncasecmp(arg, "socks5://", 9))
			opt_proxy_type = CURLPROXY_SOCKS5;
#if LIBCURL_VERSION_NUM >= 0x071200
		else if (!strncasecmp(arg, "socks4a://", 10))
			opt_proxy_type = CURLPROXY_SOCKS4A;
		else if (!strncasecmp(arg, "socks5h://", 10))
			opt_proxy_type = CURLPROXY_SOCKS5_HOSTNAME;
#endif
		else
			opt_proxy_type = CURLPROXY_HTTP;
		free(opt_proxy);
		opt_proxy = strdup(arg);
		pool_set_creds(cur_pooln);
		break;
	case 1001:
		free(opt_cert);
		opt_cert = strdup(arg);
		break;
	case 1002:
		use_colors = false;
		break;
	case 1004:
		opt_autotune = false;
		break;
	case 'l': /* scrypt --launch-config */
		{
			char *last = NULL, *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL) {
				device_config[n++] = last = strdup(pch);
				pch = strtok(NULL, ",");
			}
			while (n < MAX_GPUS)
				device_config[n++] = last;
		}
		break;
	case 'L': /* scrypt --lookup-gap */
		{
			char *pch = strtok(arg,",");
			int n = 0, last = atoi(arg);
			while (pch != NULL) {
				device_lookup_gap[n++] = last = atoi(pch);
				pch = strtok(NULL, ",");
			}
			while (n < MAX_GPUS)
				device_lookup_gap[n++] = last;
		}
		break;
	case 1050: /* scrypt --interactive */
		{
			char *pch = strtok(arg,",");
			int n = 0, last = atoi(arg);
			while (pch != NULL) {
				device_interactive[n++] = last = atoi(pch);
				pch = strtok(NULL, ",");
			}
			while (n < MAX_GPUS)
				device_interactive[n++] = last;
		}
		break;
	case 1051: /* scrypt --texture-cache */
		{
			char *pch = strtok(arg,",");
			int n = 0, last = atoi(arg);
			while (pch != NULL) {
				device_texturecache[n++] = last = atoi(pch);
				pch = strtok(NULL, ",");
			}
			while (n < MAX_GPUS)
				device_texturecache[n++] = last;
		}
		break;
	case 1070: /* --gpu-clock */
		{
			char *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				device_gpu_clocks[dev_id] = atoi(pch);
				pch = strtok(NULL, ",");
			}
		}
		break;
	case 1071: /* --mem-clock */
		{
			char *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				device_mem_clocks[dev_id] = atoi(pch);
				pch = strtok(NULL, ",");
			}
		}
		break;
	case 1072: /* --pstate */
		{
			char *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				device_pstate[dev_id] = (int8_t) atoi(pch);
				pch = strtok(NULL, ",");
			}
		}
		break;
	case 1073: /* --plimit */
		{
			char *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				device_plimit[dev_id] = atoi(pch);
				pch = strtok(NULL, ",");
			}
		}
		break;
	case 1074: /* --keep-clocks */
		opt_keep_clocks = true;
		break;
	case 1075: /* --tlimit */
		{
			char *pch = strtok(arg,",");
			int n = 0;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				device_tlimit[dev_id] = (uint8_t) atoi(pch);
				pch = strtok(NULL, ",");
			}
		}
		break;
	case 1080: /* --led */
		{
			if (!opt_led_mode)
				opt_led_mode = LED_MODE_SHARES;
			char *pch = strtok(arg,",");
			int n = 0, lastval, val;
			while (pch != NULL && n < MAX_GPUS) {
				int dev_id = device_map[n++];
				char * p = strstr(pch, "0x");
				val = p ? (int32_t) strtoul(p, NULL, 16) : atoi(pch);
				if (!val && !strcmp(pch, "mining"))
					opt_led_mode = LED_MODE_MINING;
				else if (device_led[dev_id] == -1)
					device_led[dev_id] = lastval = val;
				pch = strtok(NULL, ",");
			}
			if (lastval) while (n < MAX_GPUS) {
				device_led[n++] = lastval;
			}
		}
		break;
	case 1005:
		opt_benchmark = true;
		want_longpoll = false;
		want_stratum = false;
		have_stratum = false;
		break;
	case 1006:
		print_hash_tests();
		proper_exit(EXIT_CODE_OK);
		break;
	case 1003:
		want_longpoll = false;
		break;
	case 1007:
		want_stratum = false;
		opt_extranonce = false;
		break;
	case 1008:
		opt_time_limit = atoi(arg);
		break;
	case 1009:
		opt_shares_limit = atoi(arg);
		break;
	case 1011:
		allow_gbt = false;
		break;
	case 1012:
		opt_extranonce = false;
		break;
	case 1013:
		opt_showdiff = true;
		break;
	case 'S':
	case 1018:
		applog(LOG_INFO, "Now logging to syslog...");
		use_syslog = true;
		if (arg && strlen(arg)) {
			free(opt_syslog_pfx);
			opt_syslog_pfx = strdup(arg);
		}
		break;
	case 1020:
		p = strstr(arg, "0x");
		ul = p ? strtoul(p, NULL, 16) : atol(arg);
		if (ul > (1UL<<num_cpus)-1)
			ul = -1L;
		opt_affinity = ul;
		break;
	case 1021:
		v = atoi(arg);
		if (v < 0 || v > 5)	/* sanity check */
			show_usage_and_exit(1);
		opt_priority = v;
		break;
	case 1025: // cuda-schedule
		opt_cudaschedule = atoi(arg);
		break;
	case 1060: // max-temp
		d = atof(arg);
		opt_max_temp = d;
		break;
	case 1061: // max-diff
		d = atof(arg);
		opt_max_diff = d;
		break;
	case 1062: // max-rate
		d = atof(arg);
		p = strstr(arg, "K");
		if (p) d *= 1e3;
		p = strstr(arg, "M");
		if (p) d *= 1e6;
		p = strstr(arg, "G");
		if (p) d *= 1e9;
		opt_max_rate = d;
		break;
	case 1063: // resume-diff
		d = atof(arg);
		opt_resume_diff = d;
		break;
	case 1064: // resume-rate
		d = atof(arg);
		p = strstr(arg, "K");
		if (p) d *= 1e3;
		p = strstr(arg, "M");
		if (p) d *= 1e6;
		p = strstr(arg, "G");
		if (p) d *= 1e9;
		opt_resume_rate = d;
		break;
	case 1065: // resume-temp
		d = atof(arg);
		opt_resume_temp = d;
		break;
	case 'd': // --device
		{
			int device_thr[MAX_GPUS] = { 0 };
			int ngpus = cuda_num_devices();
			char * pch = strtok (arg,",");
			opt_n_threads = 0;
			while (pch != NULL && opt_n_threads < MAX_GPUS) {
				if (pch[0] >= '0' && pch[0] <= '9' && pch[1] == '\0')
				{
					if (atoi(pch) < ngpus)
						device_map[opt_n_threads++] = atoi(pch);
					else {
						applog(LOG_ERR, "Non-existant CUDA device #%d specified in -d option", atoi(pch));
						proper_exit(EXIT_CODE_CUDA_NODEVICE);
					}
				} else {
					int device = cuda_finddevice(pch);
					if (device >= 0 && device < ngpus)
						device_map[opt_n_threads++] = device;
					else {
						applog(LOG_ERR, "Non-existant CUDA device '%s' specified in -d option", pch);
						proper_exit(EXIT_CODE_CUDA_NODEVICE);
					}
				}
				pch = strtok (NULL, ",");
			}
			// count threads per gpu
			for (int n=0; n < opt_n_threads; n++) {
				int device = device_map[n];
				device_thr[device]++;
			}
			for (int n=0; n < ngpus; n++) {
				gpu_threads = max(gpu_threads, device_thr[n]);
			}
		}
		break;

	case 'f': // --diff-factor
		d = atof(arg);
		if (d <= 0.)
			show_usage_and_exit(1);
		opt_difficulty = d;
		break;
	case 'm': // --diff-multiplier
		d = atof(arg);
		if (d <= 0.)
			show_usage_and_exit(1);
		opt_difficulty = 1.0/d;
		break;

	/* PER POOL CONFIG OPTIONS */

	case 1100: /* pool name */
		pool_set_attr(cur_pooln, "name", arg);
		break;
	case 1101: /* pool algo */
		pool_set_attr(cur_pooln, "algo", arg);
		break;
	case 1102: /* pool scantime */
		pool_set_attr(cur_pooln, "scantime", arg);
		break;
	case 1108: /* pool time-limit */
		pool_set_attr(cur_pooln, "time-limit", arg);
		break;
	case 1109: /* pool shares-limit (1.7.6) */
		pool_set_attr(cur_pooln, "shares-limit", arg);
		break;
	case 1161: /* pool max-diff */
		pool_set_attr(cur_pooln, "max-diff", arg);
		break;
	case 1162: /* pool max-rate */
		pool_set_attr(cur_pooln, "max-rate", arg);
		break;
	case 1199:
		pool_set_attr(cur_pooln, "disabled", arg);
		break;

	case 'V':
		show_version_and_exit();
	case 'h':
		show_usage_and_exit(0);
	default:
		show_usage_and_exit(1);
	}

	if (use_syslog)
		use_colors = false;
}

void parse_config(json_t* json_obj)
{
	int i;
	json_t *val;

	if (!json_is_object(json_obj))
		return;

	for (i = 0; i < ARRAY_SIZE(options); i++) {

		if (!options[i].name)
			break;

		if (!strcasecmp(options[i].name, "config"))
			continue;

		val = json_object_get(json_obj, options[i].name);
		if (!val)
			continue;

		if (options[i].has_arg && json_is_string(val)) {
			char *s = strdup(json_string_value(val));
			if (!s)
				continue;
			parse_arg(options[i].val, s);
			free(s);
		}
		else if (options[i].has_arg && json_is_integer(val)) {
			char buf[16];
			sprintf(buf, "%d", (int) json_integer_value(val));
			parse_arg(options[i].val, buf);
		}
		else if (options[i].has_arg && json_is_real(val)) {
			char buf[16];
			sprintf(buf, "%f", json_real_value(val));
			parse_arg(options[i].val, buf);
		}
		else if (!options[i].has_arg) {
			if (json_is_true(val))
				parse_arg(options[i].val, (char*) "");
		}
		else
			applog(LOG_ERR, "JSON option %s invalid",
				options[i].name);
	}

	val = json_object_get(json_obj, "pools");
	if (val && json_typeof(val) == JSON_ARRAY) {
		parse_pool_array(val);
	}
}

static void parse_cmdline(int argc, char *argv[])
{
	int key;

	while (1) {
#if HAVE_GETOPT_LONG
		key = getopt_long(argc, argv, short_options, options, NULL);
#else
		key = getopt(argc, argv, short_options);
#endif
		if (key < 0)
			break;

		parse_arg(key, optarg);
	}
	if (optind < argc) {
		fprintf(stderr, "%s: unsupported non-option argument '%s' (see --help)\n",
			argv[0], argv[optind]);
		//show_usage_and_exit(1);
	}

	parse_config(opt_config);

	if (opt_algo == ALGO_HEAVY && opt_vote == 9999 && !opt_benchmark) {
		fprintf(stderr, "%s: Heavycoin hash requires block reward vote parameter (see --vote)\n",
			argv[0]);
		show_usage_and_exit(1);
	}

	if (opt_vote == 9999) {
		opt_vote = 0; // default, don't vote
	}
}

#ifndef WIN32
static void signal_handler(int sig)
{
	switch (sig) {
	case SIGHUP:
		applog(LOG_INFO, "SIGHUP received");
		break;
	case SIGINT:
		signal(sig, SIG_IGN);
		applog(LOG_INFO, "SIGINT received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	case SIGTERM:
		applog(LOG_INFO, "SIGTERM received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	}
}
#else
BOOL WINAPI ConsoleHandler(DWORD dwType)
{
	switch (dwType) {
	case CTRL_C_EVENT:
		applog(LOG_INFO, "CTRL_C_EVENT received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	case CTRL_BREAK_EVENT:
		applog(LOG_INFO, "CTRL_BREAK_EVENT received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	case CTRL_LOGOFF_EVENT:
		applog(LOG_INFO, "CTRL_LOGOFF_EVENT received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	case CTRL_SHUTDOWN_EVENT:
		applog(LOG_INFO, "CTRL_SHUTDOWN_EVENT received, exiting");
		proper_exit(EXIT_CODE_KILLED);
		break;
	default:
		return false;
	}
	return true;
}
#endif

int main(int argc, char *argv[])
{
	struct thr_info *thr;
	long flags;
	int i;

	printf("*** ccminer " PACKAGE_VERSION " for nVidia GPUs by tpruvot@github ***\n");
#ifdef _MSC_VER
	printf("    Built with VC++ %d and nVidia CUDA SDK %d.%d\n\n", msver(),
#else
	printf("    Built with the nVidia CUDA Toolkit %d.%d\n\n",
#endif
		CUDART_VERSION/1000, (CUDART_VERSION % 1000)/10);
	printf("  Originally based on Christian Buchner and Christian H. project\n");
	printf("  Include some of the work of djm34, sp, tsiv and klausT.\n\n");
	printf("BTC donation address: 1AJdfCpLWPNoAMDfHF1wD5y8VgKSSTHxPo (tpruvot)\n\n");

	rpc_user = strdup("");
	rpc_pass = strdup("");
	rpc_url = strdup("");
	jane_params = strdup("");

	pthread_mutex_init(&applog_lock, NULL);
	pthread_mutex_init(&stratum_sock_lock, NULL);
	pthread_mutex_init(&stratum_work_lock, NULL);
	pthread_mutex_init(&stats_lock, NULL);
	pthread_mutex_init(&g_work_lock, NULL);

	// number of cpus for thread affinity
#if defined(WIN32)
	SYSTEM_INFO sysinfo;
	GetSystemInfo(&sysinfo);
	num_cpus = sysinfo.dwNumberOfProcessors;
#elif defined(_SC_NPROCESSORS_CONF)
	num_cpus = sysconf(_SC_NPROCESSORS_CONF);
#elif defined(CTL_HW) && defined(HW_NCPU)
	int req[] = { CTL_HW, HW_NCPU };
	size_t len = sizeof(num_cpus);
	sysctl(req, 2, &num_cpus, &len, NULL, 0);
#else
	num_cpus = 1;
#endif
	if (num_cpus < 1)
		num_cpus = 1;

	// number of gpus
	active_gpus = cuda_num_devices();

	for (i = 0; i < MAX_GPUS; i++) {
		device_map[i] = i % active_gpus;
		device_name[i] = NULL;
		device_config[i] = NULL;
		device_backoff[i] = is_windows() ? 12 : 2;
		device_lookup_gap[i] = 1;
		device_batchsize[i] = 1024;
		device_interactive[i] = -1;
		device_texturecache[i] = -1;
		device_singlememory[i] = -1;
		device_pstate[i] = -1;
		device_led[i] = -1;
	}

	cuda_devicenames();

	/* parse command line */
	parse_cmdline(argc, argv);

	// extra credits..
	if (opt_algo == ALGO_VANILLA) {
		printf("  Vanilla blake optimized by Alexis Provos.\n");
		printf("VNL donation address: Vr5oCen8NrY6ekBWFaaWjCUFBH4dyiS57W\n\n");
	}

	if (!opt_benchmark && !strlen(rpc_url)) {
		// try default config file (user then binary folder)
		char defconfig[MAX_PATH] = { 0 };
		get_defconfig_path(defconfig, MAX_PATH, argv[0]);
		if (strlen(defconfig)) {
			if (opt_debug)
				applog(LOG_DEBUG, "Using config %s", defconfig);
			parse_arg('c', defconfig);
			parse_cmdline(argc, argv);
		}
	}

	if (!strlen(rpc_url)) {
		if (!opt_benchmark) {
			fprintf(stderr, "%s: no URL supplied\n", argv[0]);
			show_usage_and_exit(1);
		}
		// ensure a pool is set with default params...
		pool_set_creds(0);
	}

	/* init stratum data.. */
	memset(&stratum.url, 0, sizeof(stratum));

	// ensure default params are set
	pool_init_defaults();

	if (opt_debug)
		pool_dump_infos();
	cur_pooln = pool_get_first_valid(0);
	pool_switch(-1, cur_pooln);

	if (opt_algo == ALGO_DECRED || opt_algo == ALGO_SIA) {
		allow_gbt = false;
		allow_mininginfo = false;
	}

	flags = !opt_benchmark && strncmp(rpc_url, "https:", 6)
	      ? (CURL_GLOBAL_ALL & ~CURL_GLOBAL_SSL)
	      : CURL_GLOBAL_ALL;
	if (curl_global_init(flags)) {
		applog(LOG_ERR, "CURL initialization failed");
		return EXIT_CODE_SW_INIT_ERROR;
	}

	if (opt_background) {
#ifndef WIN32
		i = fork();
		if (i < 0) proper_exit(EXIT_CODE_SW_INIT_ERROR);
		if (i > 0) proper_exit(EXIT_CODE_OK);
		i = setsid();
		if (i < 0)
			applog(LOG_ERR, "setsid() failed (errno = %d)", errno);
		i = chdir("/");
		if (i < 0)
			applog(LOG_ERR, "chdir() failed (errno = %d)", errno);
		signal(SIGHUP, signal_handler);
		signal(SIGTERM, signal_handler);
#else
		HWND hcon = GetConsoleWindow();
		if (hcon) {
			// this method also hide parent command line window
			ShowWindow(hcon, SW_HIDE);
		} else {
			HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
			CloseHandle(h);
			FreeConsole();
		}
#endif
	}

#ifndef WIN32
	/* Always catch Ctrl+C */
	signal(SIGINT, signal_handler);
#else
	SetConsoleCtrlHandler((PHANDLER_ROUTINE)ConsoleHandler, TRUE);
	if (opt_priority > 0) {
		DWORD prio = NORMAL_PRIORITY_CLASS;
		switch (opt_priority) {
		case 1:
			prio = BELOW_NORMAL_PRIORITY_CLASS;
			break;
		case 2:
			prio = NORMAL_PRIORITY_CLASS;
			break;
		case 3:
			prio = ABOVE_NORMAL_PRIORITY_CLASS;
			break;
		case 4:
			prio = HIGH_PRIORITY_CLASS;
			break;
		case 5:
			prio = REALTIME_PRIORITY_CLASS;
		}
		SetPriorityClass(GetCurrentProcess(), prio);
	}
	// Prevent windows to sleep while mining
	SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED);
#endif
	if (opt_affinity != -1) {
		if (!opt_quiet)
			applog(LOG_DEBUG, "Binding process to cpu mask %x", opt_affinity);
		affine_to_cpu_mask(-1, (unsigned long)opt_affinity);
	}
	if (active_gpus == 0) {
		applog(LOG_ERR, "No CUDA devices found! terminating.");
		exit(1);
	}
	if (!opt_n_threads)
		opt_n_threads = active_gpus;
	else if (active_gpus > opt_n_threads)
		active_gpus = opt_n_threads;

	// generally doesn't work well...
	gpu_threads = max(gpu_threads, opt_n_threads / active_gpus);

	if (opt_benchmark && opt_algo == ALGO_AUTO) {
		bench_init(opt_n_threads);
		for (int n=0; n < MAX_GPUS; n++) {
			gpus_intensity[n] = 0; // use default
		}
		opt_autotune = false;
	}

#ifdef HAVE_SYSLOG_H
	if (use_syslog)
		openlog(opt_syslog_pfx, LOG_PID, LOG_USER);
#endif

	work_restart = (struct work_restart *)calloc(opt_n_threads, sizeof(*work_restart));
	if (!work_restart)
		return EXIT_CODE_SW_INIT_ERROR;

	thr_info = (struct thr_info *)calloc(opt_n_threads + 4, sizeof(*thr));
	if (!thr_info)
		return EXIT_CODE_SW_INIT_ERROR;

	/* longpoll thread */
	longpoll_thr_id = opt_n_threads + 1;
	thr = &thr_info[longpoll_thr_id];
	thr->id = longpoll_thr_id;
	thr->q = tq_new();
	if (!thr->q)
		return EXIT_CODE_SW_INIT_ERROR;

	/* always start the longpoll thread (will wait a tq_push on workio /LP) */
	if (unlikely(pthread_create(&thr->pth, NULL, longpoll_thread, thr))) {
		applog(LOG_ERR, "longpoll thread create failed");
		return EXIT_CODE_SW_INIT_ERROR;
	}

	/* stratum thread */
	stratum_thr_id = opt_n_threads + 2;
	thr = &thr_info[stratum_thr_id];
	thr->id = stratum_thr_id;
	thr->q = tq_new();
	if (!thr->q)
		return EXIT_CODE_SW_INIT_ERROR;

	/* always start the stratum thread (will wait a tq_push) */
	if (unlikely(pthread_create(&thr->pth, NULL, stratum_thread, thr))) {
		applog(LOG_ERR, "stratum thread create failed");
		return EXIT_CODE_SW_INIT_ERROR;
	}

	/* init workio thread */
	work_thr_id = opt_n_threads;
	thr = &thr_info[work_thr_id];
	thr->id = work_thr_id;
	thr->q = tq_new();
	if (!thr->q)
		return EXIT_CODE_SW_INIT_ERROR;

	if (pthread_create(&thr->pth, NULL, workio_thread, thr)) {
		applog(LOG_ERR, "workio thread create failed");
		return EXIT_CODE_SW_INIT_ERROR;
	}

	/* real start of the stratum work */
	if (want_stratum && have_stratum) {
		tq_push(thr_info[stratum_thr_id].q, strdup(rpc_url));
	}

#ifdef USE_WRAPNVML
#if defined(__linux__) || defined(_WIN64)
	/* nvml is currently not the best choice on Windows (only in x64) */
	hnvml = nvml_create();
	if (hnvml) {
		bool gpu_reinit = (opt_cudaschedule >= 0); //false
		cuda_devicenames(); // refresh gpu vendor name
		if (!opt_quiet)
			applog(LOG_INFO, "NVML GPU monitoring enabled.");
		for (int n=0; n < active_gpus; n++) {
			if (nvml_set_pstate(hnvml, device_map[n]) == 1)
				gpu_reinit = true;
			if (nvml_set_plimit(hnvml, device_map[n]) == 1)
				gpu_reinit = true;
			if (!is_windows() && nvml_set_clocks(hnvml, device_map[n]) == 1)
				gpu_reinit = true;
			if (gpu_reinit) {
				cuda_reset_device(n, NULL);
			}
		}
	}
#endif
#ifdef WIN32
	if (nvapi_init() == 0) {
		if (!opt_quiet)
			applog(LOG_INFO, "NVAPI GPU monitoring enabled.");
		if (!hnvml) {
			cuda_devicenames(); // refresh gpu vendor name
		}
		nvapi_init_settings();
	}
#endif
	else if (!hnvml && !opt_quiet)
		applog(LOG_INFO, "GPU monitoring is not available.");

	// force reinit to set default device flags
	if (opt_cudaschedule >= 0 && !hnvml) {
		for (int n=0; n < active_gpus; n++) {
			cuda_reset_device(n, NULL);
		}
	}
#endif

	if (opt_api_listen) {
		/* api thread */
		api_thr_id = opt_n_threads + 3;
		thr = &thr_info[api_thr_id];
		thr->id = api_thr_id;
		thr->q = tq_new();
		if (!thr->q)
			return EXIT_CODE_SW_INIT_ERROR;

		/* start stratum thread */
		if (unlikely(pthread_create(&thr->pth, NULL, api_thread, thr))) {
			applog(LOG_ERR, "api thread create failed");
			return EXIT_CODE_SW_INIT_ERROR;
		}
	}

	/* start mining threads */
	for (i = 0; i < opt_n_threads; i++) {
		thr = &thr_info[i];

		thr->id = i;
		thr->gpu.thr_id = i;
		thr->gpu.gpu_id = (uint8_t) device_map[i];
		thr->gpu.gpu_arch = (uint16_t) device_sm[device_map[i]];
		thr->q = tq_new();
		if (!thr->q)
			return EXIT_CODE_SW_INIT_ERROR;

		if (unlikely(pthread_create(&thr->pth, NULL, miner_thread, thr))) {
			applog(LOG_ERR, "thread %d create failed", i);
			return EXIT_CODE_SW_INIT_ERROR;
		}
	}

	applog(LOG_INFO, "%d miner thread%s started, "
		"using '%s' algorithm.",
		opt_n_threads, opt_n_threads > 1 ? "s":"",
		algo_names[opt_algo]);

#ifdef WIN32
	timeBeginPeriod(1); // enable high timer precision (similar to Google Chrome Trick)
#endif

	/* main loop - simply wait for workio thread to exit */
	pthread_join(thr_info[work_thr_id].pth, NULL);

	/* wait for mining threads */
	for (i = 0; i < opt_n_threads; i++)
		pthread_join(thr_info[i].pth, NULL);

	if (opt_debug)
		applog(LOG_DEBUG, "workio thread dead, exiting.");

	proper_exit(EXIT_CODE_OK);
	return 0;
}