1 /* C11 threads trylock mutex tests.
2 Copyright (C) 2018-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 #include <support/check.h>
25 /* Shared mutex between child and parent. */
28 /* Shared counter to check possible race conditions. */
29 static char shrd_counter;
31 /* Function to choose an action to do, depending on mtx_trylock
34 choose_action (int action, char* thread_name)
41 if (mtx_unlock (&mutex) != thrd_success)
42 FAIL_EXIT1 ("mtx_unlock failed");
49 FAIL_EXIT1 ("%s lock error", thread_name);
57 char child_name[] = "child";
59 /* Try to lock mutex. */
60 choose_action (mtx_trylock (&mutex), child_name);
62 thrd_exit (thrd_success);
69 char parent_name[] = "parent";
71 if (mtx_init (&mutex, mtx_timed) != thrd_success)
72 FAIL_EXIT1 ("mtx_init failed");
74 if (thrd_create (&id, child_add, NULL) != thrd_success)
75 FAIL_EXIT1 ("thrd_create failed");
77 choose_action (mtx_trylock (&mutex), parent_name);
79 if (thrd_join (id, NULL) != thrd_success)
80 FAIL_EXIT1 ("thrd_join failed");
82 if (shrd_counter != 2 && shrd_counter != 1)
83 FAIL_EXIT1 ("shrd_counter != {1,2} (%d)", shrd_counter);
90 #include <support/test-driver.c>