use trylock on mutex (#85)

mod_audio_fork/lws_glue.cpp

@@ -38,7 +38,6 @@ namespace {
   static uint32_t playCount = 0;
 
   switch_status_t processIncomingBinary(private_t* tech_pvt, switch_core_session_t* session, const char* message, size_t dataLength) {
-    CircularBuffer_t *cBuffer = (CircularBuffer_t *) tech_pvt->circularBuffer;
     uint8_t* data = reinterpret_cast<uint8_t*>(const_cast<char*>(message));
     uint16_t* data_uint16 = reinterpret_cast<uint16_t*>(data);
     std::vector<uint16_t> pcm_data(data_uint16, data_uint16 + dataLength / sizeof(uint16_t));
@@ -70,7 +69,9 @@ namespace {
       return SWITCH_STATUS_FALSE;
     }
 
-    switch_mutex_lock(tech_pvt->mutex);
+    if (nullptr != tech_pvt->mutex && switch_mutex_trylock(tech_pvt->mutex) == SWITCH_STATUS_SUCCESS) {
+      //switch_mutex_lock(tech_pvt->mutex);
+      CircularBuffer_t *cBuffer = (CircularBuffer_t *) tech_pvt->circularBuffer;
 
       try {
         // Resize the buffer if necessary
@@ -92,11 +93,11 @@ namespace {
         switch_mutex_unlock(tech_pvt->mutex);
         return SWITCH_STATUS_FALSE;
       }
-
       switch_mutex_unlock(tech_pvt->mutex);
-
       return SWITCH_STATUS_SUCCESS;
     }
+    return SWITCH_STATUS_FALSE;
+}
 
   void processIncomingMessage(private_t* tech_pvt, switch_core_session_t* session, const char* message) {
     std::string msg = message;