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 <error.h> |
19 | #include <pthread.h> |
20 | #include <stdio.h> |
21 | #include <stdlib.h> |
22 | |
23 | |
24 | static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER; |
25 | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
26 | |
27 | static pthread_barrier_t bar; |
28 | |
29 | |
30 | static void * |
31 | tf (void *a) |
32 | { |
33 | int i = (long int) a; |
34 | int err; |
35 | |
36 | printf (format: "child %d: lock\n" , i); |
37 | |
38 | err = pthread_mutex_lock (mutex: &mut); |
39 | if (err != 0) |
40 | error (EXIT_FAILURE, errnum: err, format: "locking in child failed" ); |
41 | |
42 | printf (format: "child %d: sync\n" , i); |
43 | |
44 | int e = pthread_barrier_wait (barrier: &bar); |
45 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
46 | { |
47 | puts (s: "child: barrier_wait failed" ); |
48 | exit (1); |
49 | } |
50 | |
51 | printf (format: "child %d: wait\n" , i); |
52 | |
53 | err = pthread_cond_wait (cond: &cond, mutex: &mut); |
54 | if (err != 0) |
55 | error (EXIT_FAILURE, errnum: err, format: "child %d: failed to wait" , i); |
56 | |
57 | printf (format: "child %d: woken up\n" , i); |
58 | |
59 | err = pthread_mutex_unlock (mutex: &mut); |
60 | if (err != 0) |
61 | error (EXIT_FAILURE, errnum: err, format: "child %d: unlock[2] failed" , i); |
62 | |
63 | printf (format: "child %d: done\n" , i); |
64 | |
65 | return NULL; |
66 | } |
67 | |
68 | |
69 | #define N 10 |
70 | |
71 | |
72 | static int |
73 | do_test (void) |
74 | { |
75 | pthread_t th[N]; |
76 | int i; |
77 | int err; |
78 | |
79 | printf (format: "&cond = %p\n&mut = %p\n" , &cond, &mut); |
80 | |
81 | if (pthread_barrier_init (barrier: &bar, NULL, count: 2) != 0) |
82 | { |
83 | puts (s: "barrier_init failed" ); |
84 | exit (1); |
85 | } |
86 | |
87 | pthread_attr_t at; |
88 | |
89 | if (pthread_attr_init (attr: &at) != 0) |
90 | { |
91 | puts (s: "attr_init failed" ); |
92 | return 1; |
93 | } |
94 | |
95 | if (pthread_attr_setstacksize (attr: &at, stacksize: 1 * 1024 * 1024) != 0) |
96 | { |
97 | puts (s: "attr_setstacksize failed" ); |
98 | return 1; |
99 | } |
100 | |
101 | for (i = 0; i < N; ++i) |
102 | { |
103 | printf (format: "create thread %d\n" , i); |
104 | |
105 | err = pthread_create (newthread: &th[i], attr: &at, start_routine: tf, arg: (void *) (long int) i); |
106 | if (err != 0) |
107 | error (EXIT_FAILURE, errnum: err, format: "cannot create thread %d" , i); |
108 | |
109 | printf (format: "wait for child %d\n" , i); |
110 | |
111 | /* Wait for the child to start up and get the mutex for the |
112 | conditional variable. */ |
113 | int e = pthread_barrier_wait (barrier: &bar); |
114 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
115 | { |
116 | puts (s: "barrier_wait failed" ); |
117 | exit (1); |
118 | } |
119 | } |
120 | |
121 | if (pthread_attr_destroy (attr: &at) != 0) |
122 | { |
123 | puts (s: "attr_destroy failed" ); |
124 | return 1; |
125 | } |
126 | |
127 | puts (s: "get lock ourselves" ); |
128 | |
129 | err = pthread_mutex_lock (mutex: &mut); |
130 | if (err != 0) |
131 | error (EXIT_FAILURE, errnum: err, format: "mut locking failed" ); |
132 | |
133 | puts (s: "broadcast" ); |
134 | |
135 | /* Wake up all threads. */ |
136 | err = pthread_cond_broadcast (cond: &cond); |
137 | if (err != 0) |
138 | error (EXIT_FAILURE, errnum: err, format: "parent: broadcast failed" ); |
139 | |
140 | err = pthread_mutex_unlock (mutex: &mut); |
141 | if (err != 0) |
142 | error (EXIT_FAILURE, errnum: err, format: "mut unlocking failed" ); |
143 | |
144 | /* Join all threads. */ |
145 | for (i = 0; i < N; ++i) |
146 | { |
147 | printf (format: "join thread %d\n" , i); |
148 | |
149 | err = pthread_join (th: th[i], NULL); |
150 | if (err != 0) |
151 | error (EXIT_FAILURE, errnum: err, format: "join of child %d failed" , i); |
152 | } |
153 | |
154 | puts (s: "done" ); |
155 | |
156 | return 0; |
157 | } |
158 | |
159 | |
160 | #define TEST_FUNCTION do_test () |
161 | #include "../test-skeleton.c" |
162 | |