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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* Helper for exit/dlclose race test (Bug 22180).
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Copyright (C) 2017-2019 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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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <semaphore.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/xthread.h>
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/* Semaphore defined in executable to ensure we have a happens-before
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between the first function starting and exit being called. */
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extern sem_t order1;
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/* Semaphore defined in executable to ensure we have a happens-before
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between the second function starting and the first function returning. */
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extern sem_t order2;
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/* glibc function for registering DSO-specific exit functions. */
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extern int __cxa_atexit (void (*func) (void *), void *arg, void *dso_handle);
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/* Hidden compiler handle to this shared object. */
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extern void *__dso_handle __attribute__ ((__weak__));
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static void
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first (void *start)
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{
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/* Let the exiting thread run. */
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sem_post (&order1);
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/* Wait for exiting thread to finish. */
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sem_wait (&order2);
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printf ("first\n");
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}
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static void
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second (void *start)
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{
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/* We may be called from different threads.
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This lock protects called. */
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static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
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static bool called = false;
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xpthread_mutex_lock (&mtx);
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if (called)
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FAIL_EXIT1 ("second called twice!");
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called = true;
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xpthread_mutex_unlock (&mtx);
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printf ("second\n");
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}
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__attribute__ ((constructor)) static void
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constructor (void)
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{
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sem_init (&order1, 0, 0);
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sem_init (&order2, 0, 0);
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__cxa_atexit (second, NULL, __dso_handle);
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__cxa_atexit (first, NULL, __dso_handle);
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}
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