Allow to retrieve benchmark results with a time-limit

sample command line :
ccminer -a x11 -d 0 --benchmark --time-limit 30 2>result.txt

ccminer.cpp

@@ -1491,7 +1491,15 @@ static void *miner_thread(void *userdata)
 			if (remain < 0)  {
 				app_exit_code = EXIT_CODE_TIME_LIMIT;
 				abort_flag = true;
+				if (opt_benchmark) {
+					char rate[32];
+					format_hashrate(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;
 			}
@@ -2909,7 +2917,8 @@ int main(int argc, char *argv[])
 	/* main loop - simply wait for workio thread to exit */
 	pthread_join(thr_info[work_thr_id].pth, NULL);
 
-	applog(LOG_INFO, "workio thread dead, exiting.");
+	if (opt_debug)
+		applog(LOG_DEBUG, "workio thread dead, exiting.");
 
 	proper_exit(EXIT_CODE_OK);
 

util.cpp

@@ -139,8 +139,8 @@ void applog(int prio, const char *fmt, ...)
 			use_colors ? CL_N : ""
 		);
 		pthread_mutex_lock(&applog_lock);
-		vfprintf(stderr, f, ap);	/* atomic write to stderr */
-		fflush(stderr);
+		vfprintf(stdout, f, ap);	/* atomic write to stdout */
+		fflush(stdout);
 		pthread_mutex_unlock(&applog_lock);
 	}
 	va_end(ap);