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Re: Futex alternatives.

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Re: Futex alternatives.

Subject: Re: Futex alternatives.
From: Jens Alfke <email@hidden>
Date: Mon, 16 Jul 2018 09:43:11 -0700


> On Jul 14, 2018, at 6:01 AM, Richard Schmitt <email@hidden> 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.


—Jens

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References:
	>Futex alternatives. (From: Pascal <email@hidden>)
	>Re: Futex alternatives. (From: Richard Schmitt <email@hidden>)

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