Added __init_once(), an almost exact clone of pthread_once(), with the

difference that the initialization function has an additional void* argument,
so that it is suitable for initializing stuff in objects.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34400 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/shared/locks.h

@@ -81,6 +81,13 @@ status_t	lazy_recursive_lock_lock(lazy_recursive_lock *lock);
 void		lazy_recursive_lock_unlock(lazy_recursive_lock *lock);
 int32		lazy_recursive_lock_get_recursion(lazy_recursive_lock *lock);
 
+
+#define		INIT_ONCE_UNINITIALIZED	-1
+#define		INIT_ONCE_INITIALIZED	-4
+
+status_t	__init_once(vint32* control, status_t (*initRoutine)(void*),
+				void* data);
+
 #ifdef __cplusplus
 } // extern "C"