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Database event Event is a procedural database object called by MySql at the corresponding time. An event can be called once or started periodically. It is managed by a specific thread, which is the so-called "event scheduler". Events are similar to triggers, which start when something happens. When a statement is started on the ...

Semaphore Semaphores are multiple locks that allow multiple threads to change data at the same time, while mutually exclusive locks allow only one thread to change data at the same time. Relationship between Python semaphores and mutexes A special use of semaphores is mutex. Mutex is a semaphore with an initial value of 1, which can realize th ...