1 /*
2 * barrier4.c
3 *
4 *
5 * --------------------------------------------------------------------------
6 *
7 * Pthreads-win32 - POSIX Threads Library for Win32
8 * Copyright(C) 1998 John E. Bossom
9 * Copyright(C) 1999,2005 Pthreads-win32 contributors
10 *
11 * Contact Email: rpj@callisto.canberra.edu.au
12 *
13 * The current list of contributors is contained
14 * in the file CONTRIBUTORS included with the source
15 * code distribution. The list can also be seen at the
16 * following World Wide Web location:
17 * http://sources.redhat.com/pthreads-win32/contributors.html
18 *
19 * This library is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU Lesser General Public
21 * License as published by the Free Software Foundation; either
22 * version 2 of the License, or (at your option) any later version.
23 *
24 * This library is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 * Lesser General Public License for more details.
28 *
29 * You should have received a copy of the GNU Lesser General Public
30 * License along with this library in the file COPYING.LIB;
31 * if not, write to the Free Software Foundation, Inc.,
32 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
33 *
34 * --------------------------------------------------------------------------
35 *
36 * Declare a single barrier object, multiple wait on it,
37 * and then destroy it.
38 *
39 */
40
41 #include "test.h"
42
43 enum {
44 NUMTHREADS = 16
45 };
46
47 pthread_barrier_t barrier = NULL;
48 pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
49 static int serialThreadCount = 0;
50 static int otherThreadCount = 0;
51
52 void *
func(void * arg)53 func(void * arg)
54 {
55 int result = pthread_barrier_wait(&barrier);
56
57 assert(pthread_mutex_lock(&mx) == 0);
58
59 if (result == PTHREAD_BARRIER_SERIAL_THREAD)
60 {
61 serialThreadCount++;
62 }
63 else if (0 == result)
64 {
65 otherThreadCount++;
66 }
67 else
68 {
69 printf("Barrier wait failed: error = %s\n", error_string[result]);
70 fflush(stdout);
71 return NULL;
72 }
73 assert(pthread_mutex_unlock(&mx) == 0);
74
75 return NULL;
76 }
77
78 int
main()79 main()
80 {
81 int i, j;
82 pthread_t t[NUMTHREADS + 1];
83
84 for (j = 1; j <= NUMTHREADS; j++)
85 {
86 printf("Barrier height = %d\n", j);
87
88 serialThreadCount = 0;
89
90 assert(pthread_barrier_init(&barrier, NULL, j) == 0);
91
92 for (i = 1; i <= j; i++)
93 {
94 assert(pthread_create(&t[i], NULL, func, NULL) == 0);
95 }
96
97 for (i = 1; i <= j; i++)
98 {
99 assert(pthread_join(t[i], NULL) == 0);
100 }
101
102 assert(serialThreadCount == 1);
103
104 assert(pthread_barrier_destroy(&barrier) == 0);
105 }
106
107 assert(pthread_mutex_destroy(&mx) == 0);
108
109 return 0;
110 }
111