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76a50749 UD |
1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
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 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
18 | |
19 | /* Test of POSIX barriers. */ | |
20 | ||
21 | #include <pthread.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | ||
26 | #define NTHREADS 20 | |
27 | ||
28 | #define ROUNDS 20 | |
29 | ||
30 | static pthread_barrier_t barriers[NTHREADS]; | |
31 | ||
32 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
33 | static int counters[NTHREADS]; | |
34 | static int serial[NTHREADS]; | |
35 | ||
36 | static void * | |
37 | worker (void *arg) | |
38 | { | |
39 | void *result = NULL; | |
40 | int nr = (long int) arg; | |
41 | int i; | |
42 | ||
43 | for (i = 0; i < ROUNDS; ++i) | |
44 | { | |
45 | int j; | |
46 | int retval; | |
47 | ||
48 | if (nr == 0) | |
49 | { | |
50 | memset (counters, '\0', sizeof (counters)); | |
51 | memset (serial, '\0', sizeof (serial)); | |
52 | } | |
53 | ||
54 | retval = pthread_barrier_wait (&barriers[NTHREADS - 1]); | |
55 | if (retval != 0 && retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
56 | { | |
57 | printf ("thread %d failed to wait for all the others\n", nr); | |
58 | result = (void *) 1; | |
59 | } | |
60 | ||
61 | for (j = nr; j < NTHREADS; ++j) | |
62 | { | |
63 | /* Increment the counter for this round. */ | |
64 | pthread_mutex_lock (&lock); | |
65 | ++counters[j]; | |
66 | pthread_mutex_unlock (&lock); | |
67 | ||
68 | /* Wait for the rest. */ | |
69 | retval = pthread_barrier_wait (&barriers[j]); | |
70 | ||
71 | /* Test the result. */ | |
72 | if (nr == 0 && counters[j] != j + 1) | |
73 | { | |
74 | printf ("barrier in round %d released but count is %d\n", | |
75 | j, counters[j]); | |
76 | result = (void *) 1; | |
77 | } | |
78 | ||
79 | if (retval != 0) | |
80 | { | |
81 | if (retval != PTHREAD_BARRIER_SERIAL_THREAD) | |
82 | { | |
83 | printf ("thread %d in round %d has nonzero return value != PTHREAD_BARRIER_SERIAL_THREAD\n", | |
84 | nr, j); | |
85 | result = (void *) 1; | |
86 | } | |
87 | else | |
88 | { | |
89 | pthread_mutex_lock (&lock); | |
90 | ++serial[j]; | |
91 | pthread_mutex_unlock (&lock); | |
92 | } | |
93 | } | |
94 | ||
95 | /* Wait for the rest again. */ | |
96 | retval = pthread_barrier_wait (&barriers[j]); | |
97 | ||
98 | /* Now we can check whether exactly one thread was serializing. */ | |
99 | if (nr == 0 && serial[j] != 1) | |
100 | { | |
101 | printf ("not exactly one serial thread in round %d\n", j); | |
102 | result = (void *) 1; | |
103 | } | |
104 | } | |
105 | } | |
106 | ||
107 | return result; | |
108 | } | |
109 | ||
110 | ||
111 | #define TEST_FUNCTION do_test () | |
112 | #define TIMEOUT 60 | |
113 | static int | |
114 | do_test (void) | |
115 | { | |
116 | pthread_t threads[NTHREADS]; | |
117 | int i; | |
118 | void *res; | |
119 | int result = 0; | |
120 | ||
121 | /* Initialized the barrier variables. */ | |
122 | for (i = 0; i < NTHREADS; ++i) | |
123 | if (pthread_barrier_init (&barriers[i], NULL, i + 1) != 0) | |
124 | { | |
125 | printf ("Failed to initialize barrier %d\n", i); | |
126 | exit (1); | |
127 | } | |
128 | ||
129 | /* Start the threads. */ | |
130 | for (i = 0; i < NTHREADS; ++i) | |
131 | if (pthread_create (&threads[i], NULL, worker, (void *) (long int) i) != 0) | |
132 | { | |
133 | printf ("Failed to start thread %d\n", i); | |
134 | exit (1); | |
135 | } | |
136 | ||
137 | /* And wait for them. */ | |
138 | for (i = 0; i < NTHREADS; ++i) | |
139 | if (pthread_join (threads[i], &res) != 0 || res != NULL) | |
140 | { | |
141 | printf ("thread %d returned a failure\n", i); | |
142 | result = 1; | |
143 | } | |
144 | else | |
145 | printf ("joined threads %d\n", i); | |
146 | ||
147 | if (result == 0) | |
148 | puts ("all OK"); | |
149 | ||
150 | return result; | |
151 | } | |
152 | ||
153 | #include "../test-skeleton.c" |