common: add thread_once() implementation

1 files changed, 16 insertions, 0 deletions

diff --git a/common/thread.c b/common/thread.c
index 2cf4321..d6d6c1a 100644
--- a/common/thread.c
+++ b/common/thread.c
@@ -81,3 +81,19 @@ void mutex_unlock(mutex_t* mutex)
         pthread_mutex_unlock(mutex);
 #endif
 }
+
+void thread_once(thread_once_t *once_control, void (*init_routine)(void))
+{
+#ifdef WIN32
+        while (InterlockedExchange(&(once_control->lock), 1) != 0) {
+                Sleep(1);
+        }
+        if (!once_control->state) {
+                once_control->state = 1;
+                init_routine();
+        }
+        InterlockedExchange(&(once_control->lock), 0);
+#else
+        pthread_once(once_control, init_routine);
+#endif  
+}