Coordination Primitives

  • A variant lock backed by a platform type that attempts to allow waiters to block efficiently on contention. This locking type behaves the same for both read and write locks.

    • On recent versions of Darwin (iOS 10.0, macOS 12.0, tvOS 1.0, watchOS 3.0, or better), this efficiency is a guarantee.
    • On Linux, BSD, or Android, waiters perform comparably to a kernel lock under contention.
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    Declaration

    Swift

    public final class NativeLock : Locking

  • A readers-writer lock provided by the platform implementation of the POSIX Threads standard. Read more: https://en.wikipedia.org/wiki/POSIX_Threads

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    Declaration

    Swift

    public final class POSIXReadWriteLock : Locking

  • A locking construct using a counting semaphore from Grand Central Dispatch. This locking type behaves the same for both read and write locks.

    The semaphore lock performs comparably to a spinlock under little lock contention, and comparably to a platform lock under contention.

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    Declaration

    Swift

    extension DispatchSemaphore: Locking

  • A lock object from the Foundation Kit used to coordinate the operation of multiple threads of execution within the same application.

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    Declaration

    Swift

    extension NSLock: Locking