1 | /* Test sem_wait cancellation for uncontended case. |
2 | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
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 |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
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 (s: "second call to cleanup" ); |
40 | exit (1); |
41 | } |
42 | } |
43 | |
44 | |
45 | static void * |
46 | tf (void *arg) |
47 | { |
48 | pthread_cleanup_push (cleanup, NULL); |
49 | |
50 | int e = pthread_barrier_wait (barrier: &bar); |
51 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
52 | { |
53 | puts (s: "error: tf: 1st barrier_wait failed" ); |
54 | exit (1); |
55 | } |
56 | |
57 | /* This call should be cancelable. */ |
58 | sem_wait (sem: &sem); |
59 | |
60 | pthread_cleanup_pop (0); |
61 | |
62 | return NULL; |
63 | } |
64 | |
65 | |
66 | static int |
67 | do_test (void) |
68 | { |
69 | pthread_t th; |
70 | |
71 | if (pthread_barrier_init (barrier: &bar, NULL, count: 2) != 0) |
72 | { |
73 | puts (s: "error: barrier_init failed" ); |
74 | exit (1); |
75 | } |
76 | |
77 | /* A value higher than 0 will check for uncontended pthread cancellation, |
78 | where the sem_wait operation will return immediately. */ |
79 | if (sem_init (sem: &sem, pshared: 0, value: 1) != 0) |
80 | { |
81 | puts (s: "error: sem_init failed" ); |
82 | exit (1); |
83 | } |
84 | |
85 | if (pthread_create (newthread: &th, NULL, start_routine: tf, NULL) != 0) |
86 | { |
87 | puts (s: "error: create failed" ); |
88 | exit (1); |
89 | } |
90 | |
91 | if (pthread_cancel (th: th) != 0) |
92 | { |
93 | puts (s: "error: pthread_cancel failed" ); |
94 | exit (1); |
95 | } |
96 | |
97 | int e = pthread_barrier_wait (barrier: &bar); |
98 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
99 | { |
100 | puts (s: "error: 1st barrier_wait failed" ); |
101 | exit (1); |
102 | } |
103 | |
104 | void *r; |
105 | if (pthread_join (th: th, thread_return: &r) != 0) |
106 | { |
107 | puts (s: "error: pthread_join failed" ); |
108 | exit (1); |
109 | } |
110 | |
111 | if (r != PTHREAD_CANCELED) |
112 | { |
113 | puts (s: "error: thread not canceled" ); |
114 | exit (1); |
115 | } |
116 | |
117 | return 0; |
118 | } |
119 | |
120 | |
121 | #define TEST_FUNCTION do_test () |
122 | #include "../test-skeleton.c" |
123 | |