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47677f2e | 1 | /* Test sem_wait cancellation for contended case. |
581c785b | 2 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
7726edc2 | 3 | This file is part of the GNU C Library. |
7726edc2 UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
7726edc2 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <pthread.h> | |
21 | #include <semaphore.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | ||
28 | static pthread_barrier_t bar; | |
29 | static sem_t sem; | |
30 | ||
31 | ||
32 | static void | |
33 | cleanup (void *arg) | |
34 | { | |
35 | static int ncall; | |
36 | ||
37 | if (++ncall != 1) | |
38 | { | |
39 | puts ("second call to cleanup"); | |
40 | exit (1); | |
41 | } | |
7726edc2 UD |
42 | } |
43 | ||
44 | ||
45 | static void * | |
46 | tf (void *arg) | |
47 | { | |
48 | pthread_cleanup_push (cleanup, NULL); | |
49 | ||
50 | int e = pthread_barrier_wait (&bar); | |
51 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) | |
52 | { | |
47677f2e | 53 | puts ("error: tf: 1st barrier_wait failed"); |
7726edc2 UD |
54 | exit (1); |
55 | } | |
56 | ||
57 | /* This call should block and be cancelable. */ | |
58 | sem_wait (&sem); | |
59 | ||
60 | pthread_cleanup_pop (0); | |
61 | ||
7726edc2 UD |
62 | return NULL; |
63 | } | |
64 | ||
65 | ||
66 | static int | |
67 | do_test (void) | |
68 | { | |
69 | pthread_t th; | |
70 | ||
71 | if (pthread_barrier_init (&bar, NULL, 2) != 0) | |
72 | { | |
47677f2e | 73 | puts ("error: barrier_init failed"); |
7726edc2 UD |
74 | exit (1); |
75 | } | |
76 | ||
47677f2e AZ |
77 | /* A value equal to 0 will check for contended pthread cancellation, |
78 | where the sem_wait operation will block. */ | |
7726edc2 UD |
79 | if (sem_init (&sem, 0, 0) != 0) |
80 | { | |
47677f2e | 81 | puts ("error: sem_init failed"); |
7726edc2 UD |
82 | exit (1); |
83 | } | |
84 | ||
85 | if (pthread_create (&th, NULL, tf, NULL) != 0) | |
86 | { | |
47677f2e | 87 | puts ("error: create failed"); |
7726edc2 UD |
88 | exit (1); |
89 | } | |
90 | ||
91 | int e = pthread_barrier_wait (&bar); | |
92 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) | |
93 | { | |
47677f2e | 94 | puts ("error: 1st barrier_wait failed"); |
7726edc2 UD |
95 | exit (1); |
96 | } | |
97 | ||
98 | /* Give the child a chance to go to sleep in sem_wait. */ | |
99 | sleep (1); | |
100 | ||
101 | /* Check whether cancellation is honored when waiting in sem_wait. */ | |
102 | if (pthread_cancel (th) != 0) | |
103 | { | |
47677f2e | 104 | puts ("error: 1st cancel failed"); |
7726edc2 UD |
105 | exit (1); |
106 | } | |
107 | ||
108 | void *r; | |
109 | if (pthread_join (th, &r) != 0) | |
110 | { | |
47677f2e | 111 | puts ("error: join failed"); |
7726edc2 UD |
112 | exit (1); |
113 | } | |
114 | ||
115 | if (r != PTHREAD_CANCELED) | |
116 | { | |
117 | puts ("thread not canceled"); | |
118 | exit (1); | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | ||
125 | #define TEST_FUNCTION do_test () | |
126 | #include "../test-skeleton.c" |