thread: Define ff_mutex_* macros as stub functions when threads are disabled

Silences a bunch of "statement with no effect" warnings with threads disabled.

1 files changed, 4 insertions, 4 deletions

diff --git a/libavutil/thread.h b/libavutil/thread.h
index cf0fbdda5f..ac76bb88e2 100644
--- a/libavutil/thread.h
+++ b/libavutil/thread.h
@@ -48,10 +48,10 @@
 
 #define AVMutex char
 
-#define ff_mutex_init(mutex, attr) (0)
-#define ff_mutex_lock(mutex) (0)
-#define ff_mutex_unlock(mutex) (0)
-#define ff_mutex_destroy(mutex) (0)
+static inline int ff_mutex_init(AVMutex *mutex, const void *attr){ return 0; }
+static inline int ff_mutex_lock(AVMutex *mutex){ return 0; }
+static inline int ff_mutex_unlock(AVMutex *mutex){ return 0; }
+static inline int ff_mutex_destroy(AVMutex *mutex){ return 0; }
 
 #define AVOnce char
 #define AV_ONCE_INIT 0