1 | /* Test that raise sends signal to current thread even if blocked. |
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 | #include <signal.h> |
20 | #include <support/check.h> |
21 | #include <support/xsignal.h> |
22 | #include <support/xthread.h> |
23 | #include <pthread.h> |
24 | #include <unistd.h> |
25 | |
26 | /* Used to create a dummy thread ID distinct from all other thread |
27 | IDs. */ |
28 | static void * |
29 | noop (void *ignored) |
30 | { |
31 | return NULL; |
32 | } |
33 | |
34 | static volatile pthread_t signal_thread; |
35 | |
36 | static void |
37 | signal_handler (int signo) |
38 | { |
39 | signal_thread = pthread_self (); |
40 | } |
41 | |
42 | /* Used to ensure that waiting_thread has launched and can accept |
43 | signals. */ |
44 | static pthread_barrier_t barrier; |
45 | |
46 | static void * |
47 | waiting_thread (void *ignored) |
48 | { |
49 | xpthread_barrier_wait (barrier: &barrier); |
50 | pause (); |
51 | return NULL; |
52 | } |
53 | |
54 | static int |
55 | do_test (void) |
56 | { |
57 | xsignal (SIGUSR1, handler: signal_handler); |
58 | xpthread_barrier_init (barrier: &barrier, NULL, count: 2); |
59 | |
60 | /* Distinct thread ID value to */ |
61 | pthread_t dummy = xpthread_create (NULL, thread_func: noop, NULL); |
62 | signal_thread = dummy; |
63 | |
64 | pthread_t helper = xpthread_create (NULL, thread_func: waiting_thread, NULL); |
65 | |
66 | /* Make sure that the thread is running. */ |
67 | xpthread_barrier_wait (barrier: &barrier); |
68 | |
69 | /* Block signals on this thread. */ |
70 | sigset_t set; |
71 | sigfillset (&set); |
72 | xpthread_sigmask (SIG_BLOCK, set: &set, NULL); |
73 | |
74 | /* Send the signal to this thread. It must not be delivered. */ |
75 | raise (SIGUSR1); |
76 | TEST_VERIFY (signal_thread == dummy); |
77 | |
78 | /* Wait a bit to give a chance for signal delivery (increases |
79 | chances of failure with bug 28407). */ |
80 | usleep (useconds: 50 * 1000); |
81 | |
82 | /* Unblocking should cause synchronous delivery of the signal. */ |
83 | xpthread_sigmask (SIG_UNBLOCK, set: &set, NULL); |
84 | TEST_VERIFY (signal_thread == pthread_self ()); |
85 | |
86 | xpthread_cancel (thr: helper); |
87 | xpthread_join (thr: helper); |
88 | xpthread_join (thr: dummy); |
89 | return 0; |
90 | } |
91 | |
92 | #include <support/test-driver.c> |
93 | |