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990eb09333
* provide an argument to the callback * don't ignore a callback request if it's already present in the queue * initialize mutex/cond/in_use flag before starting the thread, in case the first callback queueing request arrives before handle_manager had time to initialize * set/check abort_manager under a mutex, otherwise handle_manager thread might destroy LOCK_manager before stop_handle_manager released it * signal COND on queueing a callback, stop cond_wait on callback request * always start the thread, even if flush_time is 0 * but keep the old behavior in embedded (no replication, no galera) * style cleanups (e.g. remove volatile for a variable protected by a mutex)