projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0a07288b | 1 | /* C11 threads trylock mutex tests. |
| 2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
| 0a07288b AZ |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 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. | |
| 9 | ||
| 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. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, see | |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| 0a07288b AZ |
18 | |
| 19 | #include <threads.h> | |
| 20 | #include <stdio.h> | |
| 21 | #include <unistd.h> | |
| 22 | ||
| 23 | #include <support/check.h> | |
| 24 | ||
| 25 | /* Shared mutex between child and parent. */ | |
| 26 | static mtx_t mutex; | |
| 27 | ||
| 28 | /* Shared counter to check possible race conditions. */ | |
| 29 | static char shrd_counter; | |
| 30 | ||
| 31 | /* Function to choose an action to do, depending on mtx_trylock | |
| 32 | return value. */ | |
| 33 | static inline void | |
| 34 | choose_action (int action, char* thread_name) | |
| 35 | { | |
| 36 | switch (action) | |
| 37 | { | |
| 38 | case thrd_success: | |
| 39 | ++shrd_counter; | |
| 40 | ||
| 41 | if (mtx_unlock (&mutex) != thrd_success) | |
| 42 | FAIL_EXIT1 ("mtx_unlock failed"); | |
| 43 | break; | |
| 44 | ||
| 45 | case thrd_busy: | |
| 46 | break; | |
| 47 | ||
| 48 | case thrd_error: | |
| 49 | FAIL_EXIT1 ("%s lock error", thread_name); | |
| 50 | break; | |
| 51 | } | |
| 52 | } | |
| 53 | ||
| 54 | static int | |
| 55 | child_add (void *arg) | |
| 56 | { | |
| 57 | char child_name[] = "child"; | |
| 58 | ||
| 59 | /* Try to lock mutex. */ | |
| 60 | choose_action (mtx_trylock (&mutex), child_name); | |
| 61 | ||
| 62 | thrd_exit (thrd_success); | |
| 63 | } | |
| 64 | ||
| 65 | static int | |
| 66 | do_test (void) | |
| 67 | { | |
| 68 | thrd_t id; | |
| 69 | char parent_name[] = "parent"; | |
| 70 | ||
| 71 | if (mtx_init (&mutex, mtx_timed) != thrd_success) | |
| 72 | FAIL_EXIT1 ("mtx_init failed"); | |
| 73 | ||
| 74 | if (thrd_create (&id, child_add, NULL) != thrd_success) | |
| 75 | FAIL_EXIT1 ("thrd_create failed"); | |
| 76 | ||
| 77 | choose_action (mtx_trylock (&mutex), parent_name); | |
| 78 | ||
| 79 | if (thrd_join (id, NULL) != thrd_success) | |
| 80 | FAIL_EXIT1 ("thrd_join failed"); | |
| 81 | ||
| 82 | if (shrd_counter != 2 && shrd_counter != 1) | |
| 83 | FAIL_EXIT1 ("shrd_counter != {1,2} (%d)", shrd_counter); | |
| 84 | ||
| 85 | mtx_destroy (&mutex); | |
| 86 | ||
| 87 | return 0; | |
| 88 | } | |
| 89 | ||
| 90 | #include <support/test-driver.c> |