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91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* C11 threads trylock mutex tests.
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Copyright (C) 2018-2020 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 <threads.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <support/check.h>
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/* Shared mutex between child and parent. */
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static mtx_t mutex;
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/* Shared counter to check possible race conditions. */
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static char shrd_counter;
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/* Function to choose an action to do, depending on mtx_trylock
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return value. */
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static inline void
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choose_action (int action, char* thread_name)
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{
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switch (action)
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{
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case thrd_success:
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++shrd_counter;
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if (mtx_unlock (&mutex) != thrd_success)
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FAIL_EXIT1 ("mtx_unlock failed");
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break;
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case thrd_busy:
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break;
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case thrd_error:
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FAIL_EXIT1 ("%s lock error", thread_name);
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break;
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}
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}
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static int
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child_add (void *arg)
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{
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char child_name[] = "child";
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/* Try to lock mutex. */
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choose_action (mtx_trylock (&mutex), child_name);
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thrd_exit (thrd_success);
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}
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static int
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do_test (void)
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{
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thrd_t id;
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char parent_name[] = "parent";
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if (mtx_init (&mutex, mtx_timed) != thrd_success)
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FAIL_EXIT1 ("mtx_init failed");
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if (thrd_create (&id, child_add, NULL) != thrd_success)
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FAIL_EXIT1 ("thrd_create failed");
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choose_action (mtx_trylock (&mutex), parent_name);
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if (thrd_join (id, NULL) != thrd_success)
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FAIL_EXIT1 ("thrd_join failed");
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if (shrd_counter != 2 && shrd_counter != 1)
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FAIL_EXIT1 ("shrd_counter != {1,2} (%d)", shrd_counter);
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mtx_destroy (&mutex);
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return 0;
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}
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#include <support/test-driver.c>
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