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5a82c74822
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include "pthreadP.h"
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#include <atomic.h>
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#include <futex-internal.h>
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int
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pthread_barrier_destroy (pthread_barrier_t *barrier)
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{
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struct pthread_barrier *bar = (struct pthread_barrier *) barrier;
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/* Destroying a barrier is only allowed if no thread is blocked on it.
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Thus, there is no unfinished round, and all modifications to IN will
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have happened before us (either because the calling thread took part
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in the most recent round and thus synchronized-with all other threads
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entering, or the program ensured this through other synchronization).
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We must wait until all threads that entered so far have confirmed that
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they have exited as well. To get the notification, pretend that we have
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reached the reset threshold. */
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unsigned int count = bar->count;
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unsigned int max_in_before_reset = BARRIER_IN_THRESHOLD
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- BARRIER_IN_THRESHOLD % count;
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/* Relaxed MO sufficient because the program must have ensured that all
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modifications happen-before this load (see above). */
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unsigned int in = atomic_load_relaxed (&bar->in);
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/* Trigger reset. The required acquire MO is below. */
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if (atomic_fetch_add_relaxed (&bar->out, max_in_before_reset - in) < in)
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{
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/* Not all threads confirmed yet that they have exited, so another
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thread will perform a reset. Wait until that has happened. */
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while (in != 0)
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{
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futex_wait_simple (&bar->in, in, bar->shared);
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in = atomic_load_relaxed (&bar->in);
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}
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}
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/* We must ensure that memory reuse happens after all prior use of the
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barrier (specifically, synchronize-with the reset of the barrier or the
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confirmation of threads leaving the barrier). */
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atomic_thread_fence_acquire ();
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return 0;
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}
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