Add synchronization protection for send_frame API functions

1 files changed, 10 insertions, 2 deletions

diff --git a/toxav/toxav.c b/toxav/toxav.c
index a88a6cf4..fac6b0bc 100644
--- a/toxav/toxav.c
+++ b/toxav/toxav.c
@@ -649,7 +649,11 @@ bool toxav_audio_send_frame(ToxAV *av, uint32_t friend_number, const int16_t *pc
         goto END;
     }
 
-    pthread_mutex_lock(av->mutex);
+    if (pthread_mutex_trylock(av->mutex) != 0) {
+        rc = TOXAV_ERR_SEND_FRAME_SYNC;
+        goto END;
+    }
+    
     call = call_get(av, friend_number);
 
     if (call == NULL || !call->active || call->msi_call->state != msi_CallActive) {
@@ -728,7 +732,11 @@ bool toxav_video_send_frame(ToxAV *av, uint32_t friend_number, uint16_t width, u
         goto END;
     }
 
-    pthread_mutex_lock(av->mutex);
+    if (pthread_mutex_trylock(av->mutex) != 0) {
+        rc = TOXAV_ERR_SEND_FRAME_SYNC;
+        goto END;
+    }
+    
     call = call_get(av, friend_number);
 
     if (call == NULL || !call->active || call->msi_call->state != msi_CallActive) {