1 | /* Test that pthread_kill succeeds during thread exit. |
2 | Copyright (C) 2021-2024 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 | /* This test verifies that pthread_kill for a thread that is exiting |
20 | succeeds (with or without actually delivering the signal). */ |
21 | |
22 | #include <array_length.h> |
23 | #include <stdbool.h> |
24 | #include <stddef.h> |
25 | #include <support/xsignal.h> |
26 | #include <support/xthread.h> |
27 | #include <unistd.h> |
28 | |
29 | /* Set to true by timeout_thread_function when the test should |
30 | terminate. */ |
31 | static bool timeout; |
32 | |
33 | static void * |
34 | timeout_thread_function (void *unused) |
35 | { |
36 | usleep (useconds: 1000 * 1000); |
37 | __atomic_store_n (&timeout, true, __ATOMIC_RELAXED); |
38 | return NULL; |
39 | } |
40 | |
41 | /* Used to synchronize the sending threads with the target thread and |
42 | main thread. */ |
43 | static pthread_barrier_t barrier_1; |
44 | static pthread_barrier_t barrier_2; |
45 | |
46 | /* The target thread to which signals are to be sent. */ |
47 | static pthread_t target_thread; |
48 | |
49 | /* Set by the main thread to true after timeout has been set to |
50 | true. */ |
51 | static bool exiting; |
52 | |
53 | static void * |
54 | sender_thread_function (void *unused) |
55 | { |
56 | while (true) |
57 | { |
58 | /* Wait until target_thread has been initialized. The target |
59 | thread and main thread participate in this barrier. */ |
60 | xpthread_barrier_wait (barrier: &barrier_1); |
61 | |
62 | if (exiting) |
63 | break; |
64 | |
65 | xpthread_kill (thr: target_thread, SIGUSR1); |
66 | |
67 | /* Communicate that the signal has been sent. The main thread |
68 | participates in this barrier. */ |
69 | xpthread_barrier_wait (barrier: &barrier_2); |
70 | } |
71 | return NULL; |
72 | } |
73 | |
74 | static void * |
75 | target_thread_function (void *unused) |
76 | { |
77 | target_thread = pthread_self (); |
78 | xpthread_barrier_wait (barrier: &barrier_1); |
79 | return NULL; |
80 | } |
81 | |
82 | static int |
83 | do_test (void) |
84 | { |
85 | xsignal (SIGUSR1, SIG_IGN); |
86 | |
87 | pthread_t thr_timeout = xpthread_create (NULL, thread_func: timeout_thread_function, NULL); |
88 | |
89 | pthread_t threads[4]; |
90 | xpthread_barrier_init (barrier: &barrier_1, NULL, array_length (threads) + 2); |
91 | xpthread_barrier_init (barrier: &barrier_2, NULL, array_length (threads) + 1); |
92 | |
93 | for (int i = 0; i < array_length (threads); ++i) |
94 | threads[i] = xpthread_create (NULL, thread_func: sender_thread_function, NULL); |
95 | |
96 | while (!__atomic_load_n (&timeout, __ATOMIC_RELAXED)) |
97 | { |
98 | xpthread_create (NULL, thread_func: target_thread_function, NULL); |
99 | |
100 | /* Wait for the target thread to be set up and signal sending to |
101 | start. */ |
102 | xpthread_barrier_wait (barrier: &barrier_1); |
103 | |
104 | /* Wait for signal sending to complete. */ |
105 | xpthread_barrier_wait (barrier: &barrier_2); |
106 | |
107 | xpthread_join (thr: target_thread); |
108 | } |
109 | |
110 | exiting = true; |
111 | |
112 | /* Signal the sending threads to exit. */ |
113 | xpthread_create (NULL, thread_func: target_thread_function, NULL); |
114 | xpthread_barrier_wait (barrier: &barrier_1); |
115 | |
116 | for (int i = 0; i < array_length (threads); ++i) |
117 | xpthread_join (thr: threads[i]); |
118 | xpthread_join (thr: thr_timeout); |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | #include <support/test-driver.c> |
124 | |