Should fix #35

The problem seems to appear when a worker fails to wait indicate it is idle
by waiting the WSTATE semaphore (maybe when pool handler waited the sem
to check pool's busyness and before the pool handler post it again...)

src/pyworker.c

@@ -610,6 +610,11 @@ static void worker_set_idle()
 static void worker_set_busy()
 {
 	int err;
+	short retry;
+	struct timespec timeout;
+	timeout.tv_sec = 0;
+	timeout.tv_nsec = 100000; //0.0001s
+
 	if(!_worker_idle) { return; }
 	/**@todo The pool handler WILL decrement the sem to figure if the pool
 	 * is busy -__- Using sem_wait make sure that the worker will be able
@@ -618,18 +623,37 @@ static void worker_set_busy()
 	 * maybe to nanosleep 0.01s and retry a sem_trywait... SysV sem are
 	 * better T_T
 	 */
-	if(sem_trywait(PyFCGI_SEM(SEM_WSTATE).sem) < 0)
+	err = 0;
+	retry = 10;
+	do
 	{
-		err = errno;
-		if(err == EAGAIN)
-		{ //panic
-			pyfcgi_log(LOG_ALERT, "Unable to set busy ! WSTATE sem is allready 0 !!!");
-			_worker_idle = 0;
-			kill(PyFCGI_conf.context.ppid, SIGTERM);
-			return;
+		err = 0;
+		if(sem_trywait(PyFCGI_SEM(SEM_WSTATE).sem) < 0)
+		{
+			err = errno;
+			if(err == EAGAIN)
+			{
+				nanosleep(&timeout, NULL);
+				err = 1;
+			}
+			else
+			{
+				pyfcgi_log(LOG_ERR,
+					"error decrementing the WSTATE semaphore : %s",
+					strerror(err));
+				kill(PyFCGI_conf.context.ppid, SIGTERM);
+				return;
+			}
 		}
-		pyfcgi_log(LOG_ERR, "error decrementing the WSTATE semaphore : %s",
-			strerror(err));
+		retry--;
+	}while(err & retry);
+	if(err)
+	{
+		pyfcgi_log(LOG_ALERT,
+			"Unable to set busy ! WSTATE sem is allready 0 !!!");
+		_worker_idle = 0;
+		kill(PyFCGI_conf.context.ppid, SIGTERM);
+		kill(PyFCGI_conf.context.pid, SIGTERM);
 		return;
 	}
 	_worker_idle = 0;

src/stats.c

@@ -73,6 +73,17 @@ void pyfcgi_stats_collector(int signum)
 	stats->reqs.samples[stats->reqs.cur] = 0;
 	while( !(ret = sem_trywait(PyFCGI_SEM(SEM_WREQS).sem)) )
 	{
+		if(ret < 0)
+		{
+			pyfcgi_IPC_close(IPC_WREQS);
+			if(pyfcgi_IPC_init(IPC_WREQS))
+			{
+				pyfcgi_log(LOG_ALERT,
+					"Unable to gain access again to IPC_WREQS, exiting...");
+				kill(PyFCGI_conf.context.pid, SIGTERM);
+			}
+			continue;
+		}
 		stats->reqs.samples[stats->reqs.cur]++;
 	}
 	stats->reqs.cur++;