Futex alternatives.

[Pascal]

Hello,

In a library code source coming from Linux, I've got the following error on macOS 10.13:
simple_components/os/linux/synchronization_linux.c:29:10: fatal error: linux/futex.h: No such file or directory
#include <linux/futex.h>

I can't found any futex.h in /usr/include.

Is there macOS or Darwin alternatives to Futex?

Thanks, Pascal.
http://blady.pagesperso-orange.fr


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[Richard Schmitt]

Yes and no. 

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.  It would require you to modify the original source though (or you can provide your own wrappers to the futex calls for Darwin).  

see: https://preshing.com/20111124/always-use-a-lightweight-mutex/

Rich

On Jul 13, 2018, at 3:55 PM, Pascal <sur.p...@wanadoo.fr> wrote:

Hello,

In a library code source coming from Linux, I've got the following error on macOS 10.13:
simple_components/os/linux/synchronization_linux.c:29:10: fatal error: linux/futex.h: No such file or directory
#include <linux/futex.h>

I can't found any futex.h in /usr/include.

Is there macOS or Darwin alternatives to Futex?

Thanks, Pascal.
http://blady.pagesperso-orange.fr


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[Jens Alfke]

On Jul 14, 2018, at 6:01 AM, Richard Schmitt <rsch...@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.

—Jens