glibc/nptl/tst-rwlock15.c
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs
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
2019-09-07 02:43:31 -07:00

117 lines
2.9 KiB
C

/* Copyright (C) 2015-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This tests that a writer that is preferred -- but times out due to a
reader being present -- does not miss to wake other readers blocked on the
writer's pending lock acquisition. */
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/* The bug existed in the code that strictly prefers writers over readers. */
static pthread_rwlock_t r = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP;
static void *
writer (void *arg)
{
struct timespec ts;
if (clock_gettime (CLOCK_REALTIME, &ts) != 0)
{
puts ("clock_gettime failed");
exit (EXIT_FAILURE);
}
ts.tv_sec += 1;
int e = pthread_rwlock_timedwrlock (&r, &ts);
if (e != ETIMEDOUT)
{
puts ("timedwrlock did not time out");
exit (EXIT_FAILURE);
}
return NULL;
}
static void *
reader (void *arg)
{
/* This isn't a reliable way to get the interleaving we need (because a
failed trylock doesn't synchronize with the writer, and because we could
try to lock after the writer has already timed out). However, both will
just lead to false positives. */
int e;
while ((e = pthread_rwlock_tryrdlock (&r)) != EBUSY)
{
if (e != 0)
exit (EXIT_FAILURE);
pthread_rwlock_unlock (&r);
}
e = pthread_rwlock_rdlock (&r);
if (e != 0)
{
puts ("reader rdlock failed");
exit (EXIT_FAILURE);
}
pthread_rwlock_unlock (&r);
return NULL;
}
static int
do_test (void)
{
/* Grab a rdlock, then create a writer and a reader, and wait until they
finished. */
if (pthread_rwlock_rdlock (&r) != 0)
{
puts ("initial rdlock failed");
return 1;
}
pthread_t thw;
if (pthread_create (&thw, NULL, writer, NULL) != 0)
{
puts ("create failed");
return 1;
}
pthread_t thr;
if (pthread_create (&thr, NULL, reader, NULL) != 0)
{
puts ("create failed");
return 1;
}
if (pthread_join (thw, NULL) != 0)
{
puts ("writer join failed");
return 1;
}
if (pthread_join (thr, NULL) != 0)
{
puts ("reader join failed");
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"