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a8ac8c4725
A new thread exit lock and flag are introduced. They are used to
detect that the thread is about to exit or has exited in
__pthread_kill_internal, and the signal is not sent in this case.
The test sysdeps/pthread/tst-pthread_cancel-select-loop.c is derived
from a downstream test originally written by Marek Polacek.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 526c3cf11e)
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* Test that pthread_cancel succeeds during thread exit.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This test tries to trigger an internal race condition in
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pthread_cancel, where the cancellation signal is sent after the
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thread has begun the cancellation process. This can result in a
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spurious ESRCH error. For the original bug 12889, the window is
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quite small, so the bug was not reproduced in every run. */
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#include <stdbool.h>
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#include <stddef.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <support/xunistd.h>
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#include <sys/select.h>
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#include <unistd.h>
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/* Set to true by timeout_thread_function when the test should
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terminate. */
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static bool timeout;
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static void *
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timeout_thread_function (void *unused)
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{
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usleep (5 * 1000 * 1000);
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__atomic_store_n (&timeout, true, __ATOMIC_RELAXED);
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return NULL;
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}
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/* Used for blocking the select function below. */
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static int pipe_fds[2];
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static void *
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canceled_thread_function (void *unused)
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{
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while (true)
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{
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fd_set rfs;
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fd_set wfs;
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fd_set efs;
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FD_ZERO (&rfs);
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FD_ZERO (&wfs);
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FD_ZERO (&efs);
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FD_SET (pipe_fds[0], &rfs);
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/* If the cancellation request is recognized early, the thread
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begins exiting while the cancellation signal arrives. */
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select (FD_SETSIZE, &rfs, &wfs, &efs, NULL);
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}
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return NULL;
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}
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static int
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do_test (void)
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{
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xpipe (pipe_fds);
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pthread_t thr_timeout = xpthread_create (NULL, timeout_thread_function, NULL);
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while (!__atomic_load_n (&timeout, __ATOMIC_RELAXED))
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{
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pthread_t thr = xpthread_create (NULL, canceled_thread_function, NULL);
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xpthread_cancel (thr);
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TEST_VERIFY (xpthread_join (thr) == PTHREAD_CANCELED);
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}
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xpthread_join (thr_timeout);
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xclose (pipe_fds[0]);
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xclose (pipe_fds[1]);
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return 0;
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}
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#include <support/test-driver.c>
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