36   std::mutex* mutex;  member
50   ret->mutex = new std::mutex;  in fixed_queue_new()
82   delete queue->mutex;  in fixed_queue_free()
100   std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_is_empty()
107   std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_length()
124     std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_enqueue()
138     std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_dequeue()
155     std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_try_enqueue()
170     std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_try_dequeue()
183   std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_try_peek_first()
190   std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_try_peek_last()
199     std::lock_guard<std::mutex> lock(*queue->mutex);  in fixed_queue_try_remove_from_queue()