opentracker – An open and free bittorrent tracker
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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/uio.h>
/* Libowfat */
#include "byte.h"
#include "io.h"
#include "uint32.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_stats.h"
/* #define MTX_DBG( STRING ) fprintf( stderr, STRING ) */
#define MTX_DBG( STRING )
/* Our global all torrents list */
static ot_vector all_torrents[OT_BUCKET_COUNT];
static pthread_mutex_t bucket_mutex[OT_BUCKET_COUNT];
static size_t g_torrent_count;
/* Self pipe from opentracker.c */
extern int g_self_pipe[2];
ot_vector *mutex_bucket_lock( int bucket ) {
pthread_mutex_lock(bucket_mutex + bucket );
return all_torrents + bucket;
}
ot_vector *mutex_bucket_lock_by_hash( ot_hash hash ) {
return mutex_bucket_lock( uint32_read_big( (char*)hash ) >> OT_BUCKET_COUNT_SHIFT );
}
void mutex_bucket_unlock( int bucket, int delta_torrentcount ) {
pthread_mutex_unlock(bucket_mutex + bucket);
g_torrent_count += delta_torrentcount;
}
void mutex_bucket_unlock_by_hash( ot_hash hash, int delta_torrentcount ) {
mutex_bucket_unlock( uint32_read_big( (char*)hash ) >> OT_BUCKET_COUNT_SHIFT, delta_torrentcount );
}
size_t mutex_get_torrent_count( ) {
return g_torrent_count;
}
/* TaskQueue Magic */
struct ot_task {
ot_taskid taskid;
ot_tasktype tasktype;
int64 sock;
int iovec_entries;
struct iovec *iovec;
struct ot_task *next;
};
static ot_taskid next_free_taskid = 1;
static struct ot_task *tasklist;
static pthread_mutex_t tasklist_mutex;
static pthread_cond_t tasklist_being_filled;
int mutex_workqueue_pushtask( int64 sock, ot_tasktype tasktype ) {
struct ot_task ** tmptask, * task;
task = malloc(sizeof( struct ot_task));
if( !task )
return -1;
task->taskid = 0;
task->tasktype = tasktype;
task->sock = sock;
task->iovec_entries = 0;
task->iovec = NULL;
task->next = 0;
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
/* Skip to end of list */
tmptask = &tasklist;
while( *tmptask )
tmptask = &(*tmptask)->next;
*tmptask = task;
/* Inform waiting workers and release lock */
pthread_cond_broadcast( &tasklist_being_filled );
pthread_mutex_unlock( &tasklist_mutex );
return 0;
}
void mutex_workqueue_canceltask( int64 sock ) {
struct ot_task ** task;
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
for (task = &tasklist; *task; task = &((*task)->next))
if ((*task)->sock == sock) {
struct iovec *iovec = (*task)->iovec;
struct ot_task *ptask = *task;
int i;
/* Free task's iovec */
for( i=0; i<(*task)->iovec_entries; ++i )
free( iovec[i].iov_base );
*task = (*task)->next;
free( ptask );
break;
}
/* Release lock */
pthread_mutex_unlock( &tasklist_mutex );
}
ot_taskid mutex_workqueue_poptask( ot_tasktype *tasktype ) {
struct ot_task * task;
ot_taskid taskid = 0;
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
while( !taskid ) {
/* Skip to the first unassigned task this worker wants to do */
for (task = tasklist; task; task = task->next)
if (!task->taskid && ( TASK_CLASS_MASK & task->tasktype ) == *tasktype) {
/* If we found an outstanding task, assign a taskid to it
and leave the loop */
task->taskid = taskid = ++next_free_taskid;
*tasktype = task->tasktype;
break;
}
/* Wait until the next task is being fed */
if (!taskid)
pthread_cond_wait( &tasklist_being_filled, &tasklist_mutex );
}
/* Release lock */
pthread_mutex_unlock( &tasklist_mutex );
return taskid;
}
void mutex_workqueue_pushsuccess( ot_taskid taskid ) {
struct ot_task ** task;
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
for (task = &tasklist; *task; task = &((*task)->next))
if ((*task)->taskid == taskid) {
struct ot_task *ptask = *task;
*task = (*task)->next;
free( ptask );
break;
}
/* Release lock */
pthread_mutex_unlock( &tasklist_mutex );
}
int mutex_workqueue_pushresult( ot_taskid taskid, int iovec_entries, struct iovec *iovec ) {
struct ot_task * task;
const char byte = 'o';
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
for (task = tasklist; task; task = task->next)
if (task->taskid == taskid) {
task->iovec_entries = iovec_entries;
task->iovec = iovec;
task->tasktype = TASK_DONE;
break;
}
/* Release lock */
pthread_mutex_unlock( &tasklist_mutex );
io_trywrite( g_self_pipe[1], &byte, 1 );
/* Indicate whether the worker has to throw away results */
return task ? 0 : -1;
}
int64 mutex_workqueue_popresult( int *iovec_entries, struct iovec ** iovec ) {
struct ot_task ** task;
int64 sock = -1;
/* Want exclusive access to tasklist */
pthread_mutex_lock( &tasklist_mutex );
for (task = &tasklist; *task; task = &((*task)->next))
if ((*task)->tasktype == TASK_DONE) {
struct ot_task *ptask = *task;
*iovec_entries = (*task)->iovec_entries;
*iovec = (*task)->iovec;
sock = (*task)->sock;
*task = (*task)->next;
free( ptask );
break;
}
/* Release lock */
pthread_mutex_unlock( &tasklist_mutex );
return sock;
}
void mutex_init( ) {
int i;
pthread_mutex_init(&tasklist_mutex, NULL);
pthread_cond_init (&tasklist_being_filled, NULL);
for (i=0; i < OT_BUCKET_COUNT; ++i)
pthread_mutex_init(bucket_mutex + i, NULL);
byte_zero( all_torrents, sizeof( all_torrents ) );
}
void mutex_deinit( ) {
int i;
for (i=0; i < OT_BUCKET_COUNT; ++i)
pthread_mutex_destroy(bucket_mutex + i);
pthread_mutex_destroy(&tasklist_mutex);
pthread_cond_destroy(&tasklist_being_filled);
byte_zero( all_torrents, sizeof( all_torrents ) );
}
const char *g_version_mutex_c = "$Source$: $Revision$\n";