Scheduler pattern

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In computer programming, the scheduler pattern is a software design pattern. It is a concurrency pattern used to explicitly control when threads may execute single-threaded code, like write operation to a file.

The scheduler pattern uses an object that explicitly sequences waiting threads. It provides a mechanism to implement a scheduling policy, but is independent of any specific scheduling policy — the policy is encapsulated in its own class and is reusable.

The read/write lock pattern is usually implemented using the scheduler pattern to ensure fairness in scheduling.

Note that the scheduler pattern adds significant overhead beyond that required to call a synchronized method.

The scheduler pattern is not quite the same as the scheduled-task pattern used for real-time systems.

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