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33574c17 | 1 | /* Test barriers. |
6d7e8eda | 2 | Copyright (C) 2000-2023 Free Software Foundation, Inc. |
33574c17 ST |
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 | |
ad2b41bf ST |
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. | |
33574c17 ST |
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 | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
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/>. */ |
33574c17 ST |
18 | |
19 | #define _GNU_SOURCE | |
20 | ||
21 | #include <pthread.h> | |
22 | #include <stdio.h> | |
23 | #include <error.h> | |
24 | #include <assert.h> | |
25 | #include <errno.h> | |
26 | ||
27 | #define THREADS 500 | |
28 | #define WAITS 3 | |
29 | ||
30 | void * | |
31 | dowait (void *arg) | |
32 | { | |
33 | pthread_barrier_t *barrier = arg; | |
34 | int ret; | |
35 | ||
36 | ret = pthread_barrier_wait (barrier); | |
37 | printf ("%d ", pthread_self ()); | |
38 | return (void *) ret; | |
39 | } | |
40 | ||
41 | int | |
42 | main (int argc, char **argv) | |
43 | { | |
44 | pthread_barrierattr_t attr; | |
45 | pthread_barrier_t barrier; | |
46 | ||
47 | int i, j; | |
48 | error_t err; | |
49 | pthread_t tid[THREADS]; | |
50 | ||
51 | int havesyncs; | |
52 | ||
53 | err = pthread_barrierattr_init (&attr); | |
54 | if (err) | |
55 | error (1, err, "pthread_barrierattr_init"); | |
56 | ||
57 | err = pthread_barrierattr_getpshared (&attr, &i); | |
58 | if (err) | |
59 | error (1, err, "pthread_barrierattr_getpshared"); | |
60 | assert (i == PTHREAD_PROCESS_PRIVATE || i == PTHREAD_PROCESS_SHARED); | |
61 | ||
62 | err = pthread_barrierattr_setpshared (&attr, PTHREAD_PROCESS_PRIVATE); | |
63 | if (err) | |
64 | error (1, err, "pthread_barrierattr_setpshared"); | |
65 | ||
66 | err = pthread_barrier_init (&barrier, &attr, THREADS + 1); | |
67 | if (err) | |
68 | error (1, err, "pthread_barrier_init"); | |
69 | ||
70 | for (j = 0; j < WAITS; j++) | |
71 | { | |
72 | ||
73 | for (i = 0; i < THREADS; i++) | |
74 | { | |
75 | err = pthread_create (&tid[i], 0, dowait, &barrier); | |
76 | if (err) | |
77 | error (1, err, "pthread_create (%d)", i); | |
78 | } | |
79 | ||
80 | printf ("Manager will now call pthread_barrier_wait.\n"); | |
81 | ||
82 | havesyncs | |
83 | = pthread_barrier_wait (&barrier) == PTHREAD_BARRIER_SERIAL_THREAD | |
84 | ? 1 : 0; | |
85 | ||
86 | for (i = THREADS - 1; i >= 0; i--) | |
87 | { | |
88 | void *ret; | |
89 | err = pthread_join (tid[i], &ret); | |
90 | if (err) | |
91 | error (1, err, "pthread_join"); | |
92 | ||
93 | switch ((int) ret) | |
94 | { | |
95 | case 0: | |
96 | break; | |
97 | ||
98 | case PTHREAD_BARRIER_SERIAL_THREAD: | |
99 | havesyncs++; | |
100 | break; | |
101 | ||
102 | default: | |
103 | assert (!"Unknown value returned from pthread_barrier_wait."); | |
104 | break; | |
105 | } | |
106 | } | |
107 | ||
108 | printf ("\n"); | |
109 | ||
110 | assert (havesyncs == 1); | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } |