mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* Helper for exit/dlclose race test (Bug 22180).
|
|
Copyright (C) 2017-2018 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <semaphore.h>
|
|
#include <unistd.h>
|
|
#include <support/check.h>
|
|
#include <support/xthread.h>
|
|
|
|
/* Semaphore defined in executable to ensure we have a happens-before
|
|
between the first function starting and exit being called. */
|
|
extern sem_t order1;
|
|
|
|
/* Semaphore defined in executable to ensure we have a happens-before
|
|
between the second function starting and the first function returning. */
|
|
extern sem_t order2;
|
|
|
|
/* glibc function for registering DSO-specific exit functions. */
|
|
extern int __cxa_atexit (void (*func) (void *), void *arg, void *dso_handle);
|
|
|
|
/* Hidden compiler handle to this shared object. */
|
|
extern void *__dso_handle __attribute__ ((__weak__));
|
|
|
|
static void
|
|
first (void *start)
|
|
{
|
|
/* Let the exiting thread run. */
|
|
sem_post (&order1);
|
|
|
|
/* Wait for exiting thread to finish. */
|
|
sem_wait (&order2);
|
|
|
|
printf ("first\n");
|
|
}
|
|
|
|
static void
|
|
second (void *start)
|
|
{
|
|
/* We may be called from different threads.
|
|
This lock protects called. */
|
|
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
|
|
static bool called = false;
|
|
|
|
xpthread_mutex_lock (&mtx);
|
|
if (called)
|
|
FAIL_EXIT1 ("second called twice!");
|
|
|
|
called = true;
|
|
xpthread_mutex_unlock (&mtx);
|
|
|
|
printf ("second\n");
|
|
}
|
|
|
|
|
|
__attribute__ ((constructor)) static void
|
|
constructor (void)
|
|
{
|
|
sem_init (&order1, 0, 0);
|
|
sem_init (&order2, 0, 0);
|
|
__cxa_atexit (second, NULL, __dso_handle);
|
|
__cxa_atexit (first, NULL, __dso_handle);
|
|
}
|