| 1 | /* Test that raise sends signal to current thread even if blocked. |
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| 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <signal.h> |
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| 20 | #include <support/check.h> |
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| 21 | #include <support/xsignal.h> |
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| 22 | #include <support/xthread.h> |
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| 23 | #include <pthread.h> |
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| 24 | #include <unistd.h> |
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| 25 | |
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| 26 | /* Used to create a dummy thread ID distinct from all other thread |
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| 27 | IDs. */ |
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| 28 | static void * |
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| 29 | noop (void *ignored) |
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| 30 | { |
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| 31 | return NULL; |
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| 32 | } |
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| 33 | |
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| 34 | static volatile pthread_t signal_thread; |
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| 35 | |
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| 36 | static void |
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| 37 | signal_handler (int signo) |
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| 38 | { |
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| 39 | signal_thread = pthread_self (); |
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| 40 | } |
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| 41 | |
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| 42 | /* Used to ensure that waiting_thread has launched and can accept |
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| 43 | signals. */ |
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| 44 | static pthread_barrier_t barrier; |
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| 45 | |
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| 46 | static void * |
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| 47 | waiting_thread (void *ignored) |
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| 48 | { |
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| 49 | xpthread_barrier_wait (barrier: &barrier); |
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| 50 | pause (); |
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| 51 | return NULL; |
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| 52 | } |
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| 53 | |
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| 54 | static int |
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| 55 | do_test (void) |
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| 56 | { |
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| 57 | xsignal (SIGUSR1, handler: signal_handler); |
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| 58 | xpthread_barrier_init (barrier: &barrier, NULL, count: 2); |
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| 59 | |
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| 60 | /* Distinct thread ID value to */ |
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| 61 | pthread_t dummy = xpthread_create (NULL, thread_func: noop, NULL); |
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| 62 | signal_thread = dummy; |
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| 63 | |
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| 64 | pthread_t helper = xpthread_create (NULL, thread_func: waiting_thread, NULL); |
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| 65 | |
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| 66 | /* Make sure that the thread is running. */ |
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| 67 | xpthread_barrier_wait (barrier: &barrier); |
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| 68 | |
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| 69 | /* Block signals on this thread. */ |
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| 70 | sigset_t set; |
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| 71 | sigfillset (&set); |
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| 72 | xpthread_sigmask (SIG_BLOCK, set: &set, NULL); |
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| 73 | |
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| 74 | /* Send the signal to this thread. It must not be delivered. */ |
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| 75 | raise (SIGUSR1); |
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| 76 | TEST_VERIFY (signal_thread == dummy); |
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| 77 | |
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| 78 | /* Wait a bit to give a chance for signal delivery (increases |
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| 79 | chances of failure with bug 28407). */ |
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| 80 | usleep (useconds: 50 * 1000); |
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| 81 | |
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| 82 | /* Unblocking should cause synchronous delivery of the signal. */ |
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| 83 | xpthread_sigmask (SIG_UNBLOCK, set: &set, NULL); |
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| 84 | TEST_VERIFY (signal_thread == pthread_self ()); |
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| 85 | |
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| 86 | xpthread_cancel (thr: helper); |
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| 87 | xpthread_join (thr: helper); |
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| 88 | xpthread_join (thr: dummy); |
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| 89 | return 0; |
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| 90 | } |
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| 91 | |
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| 92 | #include <support/test-driver.c> |
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| 93 | |
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