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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
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* Test rwlock with PREFER_WRITER_NONRECURSIVE_NP (bug 23861).
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <support/xthread.h>
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/* We choose 10 iterations because this happens to be able to trigger the
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stall on contemporary hardware. */
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#define LOOPS 10
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/* We need 3 threads to trigger bug 23861. One thread as a writer, and
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two reader threads. The test verifies that the second-to-last reader
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is able to notify the *last* reader that it should be done waiting.
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If the second-to-last reader fails to notify the last reader or does
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so incorrectly then the last reader may stall indefinitely. */
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#define NTHREADS 3
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_Atomic int do_exit;
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pthread_rwlockattr_t mylock_attr;
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pthread_rwlock_t mylock;
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void *
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run_loop (void *a)
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{
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while (!do_exit)
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{
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if (random () & 1)
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{
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xpthread_rwlock_wrlock (&mylock);
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xpthread_rwlock_unlock (&mylock);
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}
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else
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{
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xpthread_rwlock_rdlock (&mylock);
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xpthread_rwlock_unlock (&mylock);
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}
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}
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return NULL;
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}
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int
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do_test (void)
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{
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xpthread_rwlockattr_init (&mylock_attr);
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xpthread_rwlockattr_setkind_np (&mylock_attr,
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PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP);
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xpthread_rwlock_init (&mylock, &mylock_attr);
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for (int n = 0; n < LOOPS; n++)
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{
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pthread_t tids[NTHREADS];
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do_exit = 0;
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for (int i = 0; i < NTHREADS; i++)
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tids[i] = xpthread_create (NULL, run_loop, NULL);
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/* Let the threads run for some time. */
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sleep (1);
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printf ("Exiting...");
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fflush (stdout);
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do_exit = 1;
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for (int i = 0; i < NTHREADS; i++)
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xpthread_join (tids[i]);
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printf ("done.\n");
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}
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pthread_rwlock_destroy (&mylock);
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pthread_rwlockattr_destroy (&mylock_attr);
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return 0;
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}
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#define TIMEOUT (DEFAULT_TIMEOUT + 3 * LOOPS)
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#include <support/test-driver.c>
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