os_unfair_lock

Peter Steinberger measured the new os_unfair_lock against OSSpinLock, pthread_mutex, NSLock, dispatch queues, and @synchronized.

Pierre Habouzit (via David Smith):

Apple’s libplatform is now OSS too with user-land os_unfair_lock (os/lock.c) in all its strict glory.

Stephan Tolksdorf:

If you use it from Swift, you have to be careful, because it’s a struct and Swift doesn’t prevent you from copying or moving it around, which normally would be an error.

Previously: OSSpinLock Is Unsafe, Mutexes and Closure Capture in Swift.

Update (2023-01-27): David Smith:

A decade or so ago, “what lock should I use?” was a fairly complicated question on macOS/iOS.

Concurrency Grand Central Dispatch (GCD) iOS iOS 10 Mac macOS 10.12 Sierra Objective-C Optimization Programming Swift Programming Language

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