Add thread sleep function

src/thread_posix.c

@@ -55,6 +55,19 @@ bh_thread_t *bh_thread_new(bh_task_t *task)
     return result;
 }
 
+int bh_thread_sleep(unsigned long timeout)
+{
+    struct timespec ts;
+
+    ts.tv_sec = timeout / 1000;
+    ts.tv_nsec = (timeout - ts.tv_sec * 1000) * 1000000;
+
+    if (nanosleep(&ts, NULL))
+        return BH_ERROR;
+
+    return BH_OK;
+}
+
 int bh_thread_join(bh_thread_t *thread)
 {
     /* Join the thread */