1 /* Copyright (C) 2002-2022 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 <error.h>
19 #include <pthread.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22
23
24 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
25 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
26
27
28 static void *
tf(void * p)29 tf (void *p)
30 {
31 int err;
32
33 err = pthread_mutex_lock (&mut);
34 if (err != 0)
35 error (EXIT_FAILURE, err, "child: cannot get mutex");
36
37 puts ("child: got mutex; signalling");
38
39 pthread_cond_signal (&cond);
40
41 puts ("child: unlock");
42
43 err = pthread_mutex_unlock (&mut);
44 if (err != 0)
45 error (EXIT_FAILURE, err, "child: cannot unlock");
46
47 puts ("child: done");
48
49 return NULL;
50 }
51
52
53 static int
do_test(void)54 do_test (void)
55 {
56 pthread_t th;
57 int err;
58
59 printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
60
61 puts ("parent: get mutex");
62
63 err = pthread_mutex_lock (&mut);
64 if (err != 0)
65 error (EXIT_FAILURE, err, "parent: cannot get mutex");
66
67 puts ("parent: create child");
68
69 err = pthread_create (&th, NULL, tf, NULL);
70 if (err != 0)
71 error (EXIT_FAILURE, err, "parent: cannot create thread");
72
73 puts ("parent: wait for condition");
74
75 /* This test will fail on spurious wake-ups, which are allowed; however,
76 the current implementation shouldn't produce spurious wake-ups in the
77 scenario we are testing here. */
78 err = pthread_cond_wait (&cond, &mut);
79 if (err != 0)
80 error (EXIT_FAILURE, err, "parent: cannot wait fir signal");
81
82 puts ("parent: got signal");
83
84 err = pthread_join (th, NULL);
85 if (err != 0)
86 error (EXIT_FAILURE, err, "parent: failed to join");
87
88 puts ("done");
89
90 return 0;
91 }
92
93
94 #define TEST_FUNCTION do_test ()
95 #include "../test-skeleton.c"
96