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On Jul 14, 2018, at 6:01 AM, Richard Schmitt <rschmitt@bluepeach.com> wrote:

futex is a user-mode implementation of a mutex (i.e. locking). Darwin doesn’t have a futex but it’s got ways to provide the locking.

From the blog post you linked to, it sounds like Darwin’s pthread_mutex is essentially a futex, i.e. it doesn’t enter the kernel unless there’s contention:

...

In MacOS 10.6.6, a lock implementation is provided using the POSIX Threads API. It’s a lightweight mutex which doesn’t enter the kernel unless there’s contention.

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