1/* Copyright (C) 2004-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <limits.h>
20#include <fcntl.h>
21#include <pthread.h>
22#include <stdbool.h>
23#include <stdlib.h>
24#include <stdio.h>
25#include <unistd.h>
26
27#include <support/xunistd.h>
28
29pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
30pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
31bool exiting;
32int fd, spins, nn;
33enum { count = 8 }; /* Number of worker threads. */
34
35void *
36tf (void *id)
37{
38 pthread_mutex_lock (mutex: &lock);
39
40 if ((long) id == 0)
41 {
42 while (!exiting)
43 {
44 if ((spins++ % 1000) == 0)
45 xwrite (fd, ".", 1);
46 pthread_mutex_unlock (mutex: &lock);
47
48 pthread_mutex_lock (mutex: &lock);
49 int njobs = rand () % (count + 1);
50 nn = njobs;
51 if ((rand () % 30) == 0)
52 pthread_cond_broadcast (cond: &cv);
53 else
54 while (njobs--)
55 pthread_cond_signal (cond: &cv);
56 }
57
58 pthread_cond_broadcast (cond: &cv);
59 }
60 else
61 {
62 while (!exiting)
63 {
64 while (!nn && !exiting)
65 pthread_cond_wait (cond: &cv, mutex: &lock);
66 --nn;
67 pthread_mutex_unlock (mutex: &lock);
68
69 pthread_mutex_lock (mutex: &lock);
70 }
71 }
72
73 pthread_mutex_unlock (mutex: &lock);
74 return NULL;
75}
76
77int
78do_test (void)
79{
80 fd = open (file: "/dev/null", O_WRONLY);
81 if (fd < 0)
82 {
83 printf (format: "couldn't open /dev/null, %m\n");
84 return 1;
85 }
86
87 pthread_t th[count + 1];
88 pthread_attr_t attr;
89 int i, ret, sz;
90 pthread_attr_init (attr: &attr);
91 sz = sysconf (_SC_PAGESIZE);
92#ifdef PTHREAD_STACK_MIN
93 if (sz < PTHREAD_STACK_MIN)
94 sz = PTHREAD_STACK_MIN;
95#endif
96 pthread_attr_setstacksize (attr: &attr, stacksize: sz);
97
98 for (i = 0; i <= count; ++i)
99 if ((ret = pthread_create (newthread: &th[i], attr: &attr, start_routine: tf, arg: (void *) (long) i)) != 0)
100 {
101 errno = ret;
102 printf (format: "pthread_create %d failed: %m\n", i);
103 return 1;
104 }
105
106 struct timespec ts = { .tv_sec = 20, .tv_nsec = 0 };
107 while (nanosleep (requested_time: &ts, remaining: &ts) != 0);
108
109 pthread_mutex_lock (mutex: &lock);
110 exiting = true;
111 pthread_mutex_unlock (mutex: &lock);
112
113 for (i = 0; i < count; ++i)
114 pthread_join (th: th[i], NULL);
115
116 close (fd: fd);
117 return 0;
118}
119
120#define TEST_FUNCTION do_test ()
121#define TIMEOUT 40
122#include "../test-skeleton.c"
123

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source code of glibc/sysdeps/pthread/tst-cond18.c