1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <error.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static void *
tf (void *a)
{
int i = (long int) a;
int err;
printf ("child %d: wait\n", i);
err = pthread_cond_wait (&cond, &mut);
if (err != 0)
error (EXIT_FAILURE, err, "child %d: failed to wait", i);
printf ("child %d: woken up\n", i);
err = pthread_mutex_unlock (&mut);
if (err != 0)
error (EXIT_FAILURE, err, "child %d: unlock failed", i);
printf ("child %d: done\n", i);
return NULL;
}
#define N 10
static int
do_test (void)
{
pthread_t th[N];
int i;
int err;
printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
puts ("first lock");
err = pthread_mutex_lock (&mut);
if (err != 0)
error (EXIT_FAILURE, err, "initial locking failed");
for (i = 0; i < N; ++i)
{
printf ("create thread %d\n", i);
err = pthread_create (&th[i], NULL, tf, (void *) (long int) i);
if (err != 0)
error (EXIT_FAILURE, err, "cannot create thread %d", i);
printf ("wait for child %d\n", i);
/* Lock and thereby wait for the child to start up and get the
conditional variable. */
pthread_mutex_lock (&mut);
}
puts ("final unlock");
/* Unlock in preparation of the broadcast. */
err = pthread_mutex_unlock (&mut);
if (err != 0)
error (EXIT_FAILURE, err, "parent: unlock failed");
puts ("broadcast");
/* Wake up all threads. */
err = pthread_cond_broadcast (&cond);
if (err != 0)
error (EXIT_FAILURE, err, "parent: broadcast failed");
/* Join all threads. */
for (i = 0; i < N; ++i)
{
printf ("join thread %d\n", i);
err = pthread_join (th[i], NULL);
if (err != 0)
error (EXIT_FAILURE, err, "join of child %d failed", i);
}
puts ("done");
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
