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0a07288b | 1 | /* C11 threads trylock mutex tests. |
d614a753 | 2 | Copyright (C) 2018-2020 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> |