Performance Schema mutex_instances Table
mutex_instances table lists all mutexes that the Performance Schema seeing while the server is executing.
A mutex is a code mechanism for ensuring that threads can only access resources one at a time. A second thread attempting to access a resource will find it protected by a mutex, and will wait for it to be unlocked.
The performance_schema_max_mutex_instances system variable specifies the maximum number of instrumented mutex instances.
|Instrument name associated with the mutex.|
|Memory address of the instrumented mutex.|