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019bf21c | 1 | /* Test of POSIX barriers. |
2b778ceb | 2 | Copyright (C) 2002-2021 Free Software Foundation, Inc. |
76a50749 | 3 | This file is part of the GNU C Library. |
76a50749 UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76a50749 | 18 | |
76a50749 UD |
19 | #include <pthread.h> |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | ||
24 | #define NTHREADS 20 | |
25 | ||
26 | #define ROUNDS 20 | |
27 | ||
28 | static pthread_barrier_t barriers[NTHREADS]; | |
29 | ||
30 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
31 | static int counters[NTHREADS]; | |
32 | static int serial[NTHREADS]; | |
33 | ||
34 | static void * | |
35 | worker (void *arg) | |
36 | { | |
37 | void *result = NULL; | |
38 | int nr = (long int) arg; | |
39 | int i; | |
40 | ||
41 | for (i = 0; i < ROUNDS; ++i) | |
42 | { | |
43 | int j; | |
44 | int retval; | |
45 | ||
46 | if (nr == 0) | |
47 | { | |
48 | memset (counters, '\0', sizeof (counters)); | |
49 | memset (serial, '\0', sizeof (serial)); | |
50 | } | |
51 | ||
52 | retval = pthread_barrier_wait (&barriers[NTHREADS - 1]); | |
53 | if (retval != 0 && retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
54 | { | |
55 | printf ("thread %d failed to wait for all the others\n", nr); | |
56 | result = (void *) 1; | |
57 | } | |
58 | ||
59 | for (j = nr; j < NTHREADS; ++j) | |
60 | { | |
61 | /* Increment the counter for this round. */ | |
62 | pthread_mutex_lock (&lock); | |
63 | ++counters[j]; | |
64 | pthread_mutex_unlock (&lock); | |
65 | ||
66 | /* Wait for the rest. */ | |
67 | retval = pthread_barrier_wait (&barriers[j]); | |
68 | ||
69 | /* Test the result. */ | |
70 | if (nr == 0 && counters[j] != j + 1) | |
71 | { | |
72 | printf ("barrier in round %d released but count is %d\n", | |
73 | j, counters[j]); | |
74 | result = (void *) 1; | |
75 | } | |
76 | ||
77 | if (retval != 0) | |
78 | { | |
79 | if (retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
80 | { | |
81 | printf ("thread %d in round %d has nonzero return value != PTHREAD_BARRIER_SERIAL_THREAD\n", | |
82 | nr, j); | |
83 | result = (void *) 1; | |
84 | } | |
85 | else | |
86 | { | |
87 | pthread_mutex_lock (&lock); | |
88 | ++serial[j]; | |
89 | pthread_mutex_unlock (&lock); | |
90 | } | |
91 | } | |
92 | ||
93 | /* Wait for the rest again. */ | |
94 | retval = pthread_barrier_wait (&barriers[j]); | |
95 | ||
96 | /* Now we can check whether exactly one thread was serializing. */ | |
97 | if (nr == 0 && serial[j] != 1) | |
98 | { | |
99 | printf ("not exactly one serial thread in round %d\n", j); | |
100 | result = (void *) 1; | |
101 | } | |
102 | } | |
103 | } | |
104 | ||
105 | return result; | |
106 | } | |
107 | ||
108 | ||
109 | #define TEST_FUNCTION do_test () | |
110 | #define TIMEOUT 60 | |
111 | static int | |
112 | do_test (void) | |
113 | { | |
114 | pthread_t threads[NTHREADS]; | |
115 | int i; | |
116 | void *res; | |
117 | int result = 0; | |
118 | ||
119 | /* Initialized the barrier variables. */ | |
120 | for (i = 0; i < NTHREADS; ++i) | |
121 | if (pthread_barrier_init (&barriers[i], NULL, i + 1) != 0) | |
122 | { | |
123 | printf ("Failed to initialize barrier %d\n", i); | |
124 | exit (1); | |
125 | } | |
126 | ||
127 | /* Start the threads. */ | |
128 | for (i = 0; i < NTHREADS; ++i) | |
129 | if (pthread_create (&threads[i], NULL, worker, (void *) (long int) i) != 0) | |
130 | { | |
131 | printf ("Failed to start thread %d\n", i); | |
132 | exit (1); | |
133 | } | |
134 | ||
135 | /* And wait for them. */ | |
136 | for (i = 0; i < NTHREADS; ++i) | |
137 | if (pthread_join (threads[i], &res) != 0 || res != NULL) | |
138 | { | |
139 | printf ("thread %d returned a failure\n", i); | |
140 | result = 1; | |
141 | } | |
142 | else | |
143 | printf ("joined threads %d\n", i); | |
144 | ||
145 | if (result == 0) | |
146 | puts ("all OK"); | |
147 | ||
148 | return result; | |
149 | } | |
150 | ||
151 | #include "../test-skeleton.c" |