1/* Copyright (C) 2002-2024 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 <pthread.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <time.h>
24
25
26static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
27
28
29static void *
30tf (void *arg)
31{
32 if (pthread_mutex_lock (mutex: &lock) != 0)
33 {
34 puts (s: "child: mutex_lock failed");
35 return NULL;
36 }
37
38 return (void *) 42l;
39}
40
41
42static int
43do_test (void)
44{
45 pthread_t th;
46
47 if (pthread_mutex_lock (mutex: &lock) != 0)
48 {
49 puts (s: "mutex_lock failed");
50 exit (1);
51 }
52
53 if (pthread_create (newthread: &th, NULL, start_routine: tf, NULL) != 0)
54 {
55 puts (s: "mutex_create failed");
56 exit (1);
57 }
58
59 void *status;
60 int val = pthread_tryjoin_np (th: th, thread_return: &status);
61 if (val == 0)
62 {
63 puts (s: "1st tryjoin succeeded");
64 exit (1);
65 }
66 else if (val != EBUSY)
67 {
68 puts (s: "1st tryjoin didn't return EBUSY");
69 exit (1);
70 }
71
72 if (pthread_mutex_unlock (mutex: &lock) != 0)
73 {
74 puts (s: "mutex_unlock failed");
75 exit (1);
76 }
77
78 while ((val = pthread_tryjoin_np (th: th, thread_return: &status)) != 0)
79 {
80 if (val != EBUSY)
81 {
82 printf (format: "tryjoin returned %s (%d), expected only 0 or EBUSY\n",
83 strerror (errnum: val), val);
84 exit (1);
85 }
86
87 /* Delay minimally. */
88 struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000 };
89 nanosleep (requested_time: &ts, NULL);
90 }
91
92 if (status != (void *) 42l)
93 {
94 printf (format: "return value %p, expected %p\n", status, (void *) 42l);
95 exit (1);
96 }
97
98 return 0;
99}
100
101#define TEST_FUNCTION do_test ()
102#include "../test-skeleton.c"
103

source code of glibc/sysdeps/pthread/tst-join2.c