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Date: Sun, 27 Nov 2016 12:37:44 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Cc: Sebastian Kemper <sebastian_ml@....net>
Subject: Re: Robust shared mutexes?
* Sebastian Kemper <sebastian_ml@....net> [2016-11-27 11:54:34 +0100]:
> On Sun, Nov 27, 2016 at 12:01:10AM +0100, Szabolcs Nagy wrote:
> > * Rich Felker <dalias@...c.org> [2016-11-26 17:56:18 -0500]:
> > > On Sat, Nov 26, 2016 at 11:51:05PM +0100, Sebastian Kemper wrote:
> > > >
> > > > http://lists.openembedded.org/pipermail/openembedded-core/2016-March/119214.html
> > > >
> > > > It says musl doesn't have process shared mutexes so one should set
> > > > apr_cv_process_shared_works=no. I take it that is correct?
> > >
> > > No, it's incorrect and I have no idea where that idea came from. I'll
> > > ask Khem.
> > >
> >
> > apr might care about sharing mutexes across i386 vs x86_64 ?
> >
> > that does not work (glibc ditto)
>
> Hello Szabolcs, list,
>
> I installed a Gentoo musl-1.1.15 x86_64 chroot on my computer. Then I
> ran ./configure in apr-1.5.2 in the musl chroot and also outside the
> chroot in a glibc-2.22 environment.
>
> The outcome was the same except for apr_cv_mutex_robust_shared:
>
> ac_cv_func_setpgrp_void musl yes glibc yes
> ac_cv_file__dev_zero musl yes glibc yes
> apr_cv_tcp_nodelay_with_cork musl yes glibc yes
> apr_cv_mutex_recursive musl yes glibc yes
> ac_cv_func_pthread_rwlock_init musl yes glibc yes
> apr_cv_type_rwlock_t=yes musl yes glibc yes
> apr_cv_process_shared_works musl yes glibc yes
> apr_cv_mutex_robust_shared musl no glibc yes
>
> I've posted the corresponding part from config.log below. It fails
> because musl doesn't define PTHREAD_MUTEX_ROBUST_NP (glibc does). And
> apr uses PTHREAD_MUTEX_ROBUST_NP. It means that I should set
> apr_cv_mutex_robust_shared=no when cross-compiling this apr, I suppose
> :)
the standard name is PTHREAD_MUTEX_ROBUST since posix2008,
so this is an apr bug.
> configure:25459: checking for robust cross-process mutex support
> configure:25500: gcc -o conftest -g -O2 -DLINUX -D_REENTRANT -D_GNU_SOURCE conftest.c -lpthread >&5
> conftest.c: In function 'main':
> conftest.c:197:47: error: 'PTHREAD_MUTEX_ROBUST_NP' undeclared (first use in this function)
> if (pthread_mutexattr_setrobust_np(&attr, PTHREAD_MUTEX_ROBUST_NP))
> ^
i think they should use the standard name and provide
their own definition on legacy systems
#ifndef PTHREAD_MUTEX_ROBUST
#define PTHREAD_MUTEX_ROBUST PTHREAD_MUTEX_ROBUST_NP
#endif
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