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Message-ID: <CAOZ3c1qsnRpen7qffb-QT4Vja0qoHwcoa2v26HKdZOTsmnSmMw@mail.gmail.com>
Date: Sat, 5 Oct 2024 05:18:31 +0100
From: zxuiji <gb2985@...il.com>
To: musl@...ts.openwall.com
Subject: Re: pthread_mutex_timedlock
Since he brought up the function it's likely already in musl
On Fri, 4 Oct 2024 at 16:11, Daniele GMail <d.dario76@...il.com> wrote:
> On Fri, 2024-10-04 at 09:16 -0500, Samuel Holland wrote:
> > On 10/4/24 08:02, Daniele GMail wrote:
> > > Hi,
> > > I have a question about pthread_mutex_timedlock.
> > >
> > > From the man page I see
> > >
> > > [...]
> > >
> > > If the Timers option is supported, the timeout shall be based on
> > > the
> > > CLOCK_REALTIME clock; if the Timers option is not supported, the
> > > timeout shall be based on the system clock as returned by the
> > > time()
> > > function.
> > >
> > > [...]
> > >
> > > Can anybody explain me why there's no possibility to choose a
> > > different
> > > clock like could be done for the pthread_cond_timedwait?
> >
> > This is an omission in the standard[0], that was resolved in POSIX
> > 2024[1] by adding pthread_mutex_clocklock(), which does what you
> > want.
> >
> > [0]: https://www.austingroupbugs.net/view.php?id=1216
> > [1]:
> >
> https://pubs.opengroup.org/onlinepubs/9799919799.2024edition/functions/pthread_mutex_clocklock.html
>
> Oh, this is great news.
>
> But guess that since this is dated 2024 is not yet part of musl 1.2.5
> right? Are there plans on when it will be available?
>
> >
> > > I have a lot of places in my code where timedlock of mutexes
> > > affected
> > > by time changes could lead to problems and it is really difficult
> > > to
> > > distinguish timeouts caused by time changes from other ones in
> > > order to
> > > decide how to react.
> > >
> > > Can someone point me to a portable workaround for this?
> > >
> > > Thanks in advance,
> > > Daniele.
>
>
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