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Date: Fri, 4 Mar 2016 18:33:24 -0500
From: Rich Felker <>
Subject: Re: [PATCH] add sched_getcpu

On Fri, Mar 04, 2016 at 11:21:49PM +0100, Tomasz Sterna wrote:
> W dniu 02.03.2016, śro o godzinie 18∶26 -0500, użytkownik Rich Felker
> napisał:
> > The only safe way to make your own threads is to refrain from using
> > libc at all and do your own syscalls. Even calling syscall() may not
> > be safe (on i386/glibc it probably uses the vdso syscall pointer from
> > TLS); you really need to use asm to make the syscall.
> I understand.
> Thank you for explaining.
> > Is there a reason "pthreads is not a good way to do it"?
> The thread API I am implementing differs much to pthreads, which
> required a lot of glue code translating one API to another and felt
> hand wrenching.

Are you sure? The only functions you really need to use pthreads are
pthread_create and one of either pthread_join or pthread_detach.
Beyond that, how you do your synchronization is up to you; the
standard functions are convenient but you're free to roll your own in
terms of atomics and futex or whatever.


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