setting the name of the threads for linux,freebsd,openbsd and osx

code is borrowed from bitcoins util.c, so it is already tested

cgminer.c

@@ -3036,6 +3036,8 @@ static void *get_work_thread(void *userdata)
 
 	pthread_detach(pthread_self());
 
+	RenameThread("get_work");
+
 	applog(LOG_DEBUG, "Creating extra get work thread");
 
 retry:
@@ -3219,6 +3221,8 @@ static void *submit_work_thread(void *userdata)
 
 	pthread_detach(pthread_self());
 
+	RenameThread("submit_work");
+
 	applog(LOG_DEBUG, "Creating extra submit work thread");
 
 	check_solve(work);
@@ -3662,6 +3666,8 @@ static void *stage_thread(void *userdata)
 
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("stage");
+
 	while (ok) {
 		struct work *work = NULL;
 
@@ -4341,6 +4347,8 @@ static void *input_thread(void __maybe_unused *userdata)
 {
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("input");
+
 	if (!curses_active)
 		return NULL;
 
@@ -4377,6 +4385,8 @@ static void *workio_thread(void *userdata)
 
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("work_io");
+
 	while (ok) {
 		struct workio_cmd *wc;
 
@@ -4416,6 +4426,8 @@ static void *api_thread(void *userdata)
 	pthread_detach(pthread_self());
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("api");
+
 	api(api_thr_id);
 
 	PTH(mythr) = 0L;
@@ -4662,6 +4674,8 @@ static void *stratum_thread(void *userdata)
 
 	pthread_detach(pthread_self());
 
+	RenameThread("stratum");
+
 	while (42) {
 		struct timeval timeout;
 		fd_set rd;
@@ -5495,6 +5509,8 @@ void *miner_thread(void *userdata)
 
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("miner");
+
 	gettimeofday(&getwork_start, NULL);
 
 	if (api->thread_init && !api->thread_init(mythr)) {
@@ -5750,6 +5766,8 @@ static void *longpoll_thread(void *userdata)
 	char *lp_url;
 	int rolltime;
 
+	RenameThread("longpoll");
+
 	curl = curl_easy_init();
 	if (unlikely(!curl)) {
 		applog(LOG_ERR, "CURL initialisation failed");
@@ -5941,6 +5959,8 @@ static void *watchpool_thread(void __maybe_unused *userdata)
 
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("watchpool");
+
 	while (42) {
 		struct timeval now;
 		int i;
@@ -6012,6 +6032,8 @@ static void *watchdog_thread(void __maybe_unused *userdata)
 
 	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 
+	RenameThread("watchdog");
+
 	memset(&zero_tv, 0, sizeof(struct timeval));
 	gettimeofday(&rotate_tv, NULL);
 

util.c

@@ -1496,3 +1496,19 @@ void *realloc_strcat(char *ptr, char *s)
 	free(ptr);
 	return ret;
 }
+
+void RenameThread(const char* name)
+{
+#if defined(PR_SET_NAME)
+	// Only the first 15 characters are used (16 - NUL terminator)
+	prctl(PR_SET_NAME, name, 0, 0, 0);
+#elif (defined(__FreeBSD__) || defined(__OpenBSD__))
+	pthread_set_name_np(pthread_self(), name);
+#elif defined(MAC_OSX)
+	pthread_setname_np(name);
+#else
+	// Prevent warnings for unused parameters...
+	(void)name;
+#endif
+}
+