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019bf21c | 1 | /* Test of POSIX barriers. |
d614a753 | 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
76a50749 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
76a50749 | 19 | |
76a50749 UD |
20 | #include <pthread.h> |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | ||
25 | #define NTHREADS 20 | |
26 | ||
27 | #define ROUNDS 20 | |
28 | ||
29 | static pthread_barrier_t barriers[NTHREADS]; | |
30 | ||
31 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
32 | static int counters[NTHREADS]; | |
33 | static int serial[NTHREADS]; | |
34 | ||
35 | static void * | |
36 | worker (void *arg) | |
37 | { | |
38 | void *result = NULL; | |
39 | int nr = (long int) arg; | |
40 | int i; | |
41 | ||
42 | for (i = 0; i < ROUNDS; ++i) | |
43 | { | |
44 | int j; | |
45 | int retval; | |
46 | ||
47 | if (nr == 0) | |
48 | { | |
49 | memset (counters, '\0', sizeof (counters)); | |
50 | memset (serial, '\0', sizeof (serial)); | |
51 | } | |
52 | ||
53 | retval = pthread_barrier_wait (&barriers[NTHREADS - 1]); | |
54 | if (retval != 0 && retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
55 | { | |
56 | printf ("thread %d failed to wait for all the others\n", nr); | |
57 | result = (void *) 1; | |
58 | } | |
59 | ||
60 | for (j = nr; j < NTHREADS; ++j) | |
61 | { | |
62 | /* Increment the counter for this round. */ | |
63 | pthread_mutex_lock (&lock); | |
64 | ++counters[j]; | |
65 | pthread_mutex_unlock (&lock); | |
66 | ||
67 | /* Wait for the rest. */ | |
68 | retval = pthread_barrier_wait (&barriers[j]); | |
69 | ||
70 | /* Test the result. */ | |
71 | if (nr == 0 && counters[j] != j + 1) | |
72 | { | |
73 | printf ("barrier in round %d released but count is %d\n", | |
74 | j, counters[j]); | |
75 | result = (void *) 1; | |
76 | } | |
77 | ||
78 | if (retval != 0) | |
79 | { | |
80 | if (retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
81 | { | |
82 | printf ("thread %d in round %d has nonzero return value != PTHREAD_BARRIER_SERIAL_THREAD\n", | |
83 | nr, j); | |
84 | result = (void *) 1; | |
85 | } | |
86 | else | |
87 | { | |
88 | pthread_mutex_lock (&lock); | |
89 | ++serial[j]; | |
90 | pthread_mutex_unlock (&lock); | |
91 | } | |
92 | } | |
93 | ||
94 | /* Wait for the rest again. */ | |
95 | retval = pthread_barrier_wait (&barriers[j]); | |
96 | ||
97 | /* Now we can check whether exactly one thread was serializing. */ | |
98 | if (nr == 0 && serial[j] != 1) | |
99 | { | |
100 | printf ("not exactly one serial thread in round %d\n", j); | |
101 | result = (void *) 1; | |
102 | } | |
103 | } | |
104 | } | |
105 | ||
106 | return result; | |
107 | } | |
108 | ||
109 | ||
110 | #define TEST_FUNCTION do_test () | |
111 | #define TIMEOUT 60 | |
112 | static int | |
113 | do_test (void) | |
114 | { | |
115 | pthread_t threads[NTHREADS]; | |
116 | int i; | |
117 | void *res; | |
118 | int result = 0; | |
119 | ||
120 | /* Initialized the barrier variables. */ | |
121 | for (i = 0; i < NTHREADS; ++i) | |
122 | if (pthread_barrier_init (&barriers[i], NULL, i + 1) != 0) | |
123 | { | |
124 | printf ("Failed to initialize barrier %d\n", i); | |
125 | exit (1); | |
126 | } | |
127 | ||
128 | /* Start the threads. */ | |
129 | for (i = 0; i < NTHREADS; ++i) | |
130 | if (pthread_create (&threads[i], NULL, worker, (void *) (long int) i) != 0) | |
131 | { | |
132 | printf ("Failed to start thread %d\n", i); | |
133 | exit (1); | |
134 | } | |
135 | ||
136 | /* And wait for them. */ | |
137 | for (i = 0; i < NTHREADS; ++i) | |
138 | if (pthread_join (threads[i], &res) != 0 || res != NULL) | |
139 | { | |
140 | printf ("thread %d returned a failure\n", i); | |
141 | result = 1; | |
142 | } | |
143 | else | |
144 | printf ("joined threads %d\n", i); | |
145 | ||
146 | if (result == 0) | |
147 | puts ("all OK"); | |
148 | ||
149 | return result; | |
150 | } | |
151 | ||
152 | #include "../test-skeleton.c" |