1 | /* C11 threads timed 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 char shrd_counter; |
30 | |
31 | /* Maximum amount of time waiting for mutex. */ |
32 | static struct timespec wait_time; |
33 | |
34 | /* Function to choose an action to do, depending on mtx_timedlock |
35 | return value. */ |
36 | static inline void |
37 | choose_action (int action, char* thread_name) |
38 | { |
39 | switch (action) |
40 | { |
41 | case thrd_success: |
42 | ++shrd_counter; |
43 | |
44 | if (mtx_unlock (mutex: &mutex) != thrd_success) |
45 | FAIL_EXIT1 ("mtx_unlock failed" ); |
46 | break; |
47 | |
48 | case thrd_timedout: |
49 | break; |
50 | |
51 | case thrd_error: |
52 | FAIL_EXIT1 ("%s lock error" , thread_name); |
53 | break; |
54 | } |
55 | } |
56 | |
57 | static int |
58 | child_add (void *arg) |
59 | { |
60 | char child_name[] = "child" ; |
61 | |
62 | /* Try to lock mutex. */ |
63 | choose_action (action: mtx_timedlock (mutex: &mutex, time_point: &wait_time), thread_name: child_name); |
64 | thrd_exit (res: thrd_success); |
65 | } |
66 | |
67 | static int |
68 | do_test (void) |
69 | { |
70 | thrd_t id; |
71 | char parent_name[] = "parent" ; |
72 | |
73 | if (mtx_init (mutex: &mutex, type: mtx_timed) != thrd_success) |
74 | FAIL_EXIT1 ("mtx_init failed" ); |
75 | |
76 | if (clock_gettime (CLOCK_REALTIME, tp: &wait_time) != 0) |
77 | FAIL_EXIT1 ("clock_gettime failed" ); |
78 | /* Tiny amount of time, to assure that if any thread finds it busy. |
79 | It will receive thrd_timedout. */ |
80 | wait_time.tv_nsec += 1; |
81 | if (wait_time.tv_nsec == 1000 * 1000 * 1000) |
82 | { |
83 | wait_time.tv_sec += 1; |
84 | wait_time.tv_nsec = 0; |
85 | } |
86 | |
87 | if (thrd_create (thr: &id, func: child_add, NULL) != thrd_success) |
88 | FAIL_EXIT1 ("thrd_create failed" ); |
89 | |
90 | choose_action (action: mtx_timedlock (mutex: &mutex, time_point: &wait_time), thread_name: parent_name); |
91 | |
92 | if (thrd_join (thr: id, NULL) != thrd_success) |
93 | FAIL_EXIT1 ("thrd_join failed" ); |
94 | |
95 | if (shrd_counter != 2 && shrd_counter != 1) |
96 | FAIL_EXIT1 ("shrd_counter != {1,2} (%d)" , shrd_counter); |
97 | |
98 | mtx_destroy (mutex: &mutex); |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | #include <support/test-driver.c> |
104 | |