Add IOMutex to IO Operations

ExistentialAudio · Aug 8, 2020 · ba30813 · ba30813
1 parent e7a0615
commit ba30813
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/BlackHole/BlackHole.c b/BlackHole/BlackHole.c
@@ -3885,6 +3885,9 @@ static OSStatus	BlackHole_DoIOOperation(AudioServerPlugInDriverRef inDriver, Aud
 	FailWithAction(inDeviceObjectID != kObjectID_Device, theAnswer = kAudioHardwareBadObjectError, Done, "BlackHole_DoIOOperation: bad device ID");
 	FailWithAction((inStreamObjectID != kObjectID_Stream_Input) && (inStreamObjectID != kObjectID_Stream_Output), theAnswer = kAudioHardwareBadObjectError, Done, "BlackHole_DoIOOperation: bad stream ID");
 
+    // IO Lock
+    pthread_mutex_lock(&gDevice_IOMutex);
+
     /*     READ INPUT         */
 	if(inOperationID == kAudioServerPlugInIOOperationReadInput)
 	{
@@ -3960,6 +3963,8 @@ static OSStatus	BlackHole_DoIOOperation(AudioServerPlugInDriverRef inDriver, Aud
         // clear the io buffer
         memset(ioMainBuffer, 0, inIOBufferByteSize);
     }
+
+    pthread_mutex_unlock(&gDevice_IOMutex);
 
 Done:
 	return theAnswer;