| 1 | /* C11 threads basic mutex tests. |
|---|---|
| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
| 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 |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 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 int counter; |
| 30 | |
| 31 | static int |
| 32 | child_add (void *arg) |
| 33 | { |
| 34 | if (mtx_lock (mutex: &mutex) != thrd_success) |
| 35 | FAIL_EXIT1 ("mtx_lock failed"); |
| 36 | |
| 37 | counter++; |
| 38 | |
| 39 | if (mtx_unlock (mutex: &mutex) != thrd_success) |
| 40 | FAIL_EXIT1 ("mtx_unlock failed"); |
| 41 | |
| 42 | thrd_exit (res: thrd_success); |
| 43 | } |
| 44 | |
| 45 | static int |
| 46 | do_test (void) |
| 47 | { |
| 48 | mtx_init (mutex: &mutex, type: mtx_plain); |
| 49 | |
| 50 | thrd_t id; |
| 51 | if (thrd_create (thr: &id, func: child_add, NULL) != thrd_success) |
| 52 | FAIL_EXIT1 ("thrd_create failed"); |
| 53 | |
| 54 | if (mtx_lock (mutex: &mutex) != thrd_success) |
| 55 | FAIL_EXIT1 ("mtx_lock failed"); |
| 56 | |
| 57 | counter++; |
| 58 | |
| 59 | if (mtx_unlock (mutex: &mutex) != thrd_success) |
| 60 | FAIL_EXIT1 ("mtx_unlock failed"); |
| 61 | |
| 62 | if (thrd_join (thr: id, NULL) != thrd_success) |
| 63 | FAIL_EXIT1 ("thrd_join failed"); |
| 64 | |
| 65 | if (counter != 2) |
| 66 | FAIL_EXIT1 ("counter (%d) != 2", counter); |
| 67 | |
| 68 | mtx_destroy (mutex: &mutex); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | #include <support/test-driver.c> |
| 74 |