Shared Lock

While not the primary focus of the library, Door also offer implementations of read-preferring and write-preferring shared locks (readers-writer locks).

The read-preferring implementations in this library follow the pseudocode in Concurrent Programming: Algorithms, Principles, and Foundations by Michel Raynal.

The usual acquire/release interface as modelled by door.primitives.Acquirable is not sufficient to describe the functionalities of shared locks. Therefore, for door.primitives.SAcquirable, we expand the interface as follows:

• acquire-read

• release-read

• acquire-write

• release-write

We offer implementations for both synchronous and asynchronous programming. These classes of shared locks are available, for different use cases:

Read-preferring:

• door.threading2.RSLock for multithreading.

• door.multiprocessing2.RSLock for multiprocessing.

• door.asyncio2.RSLock for asynchronous programming.

Write-preferring:

• door.threading2.WSLock for multithreading.

• door.multiprocessing2.WSLock for multiprocessing.

• door.asyncio2.WSLock for asynchronous programming.