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3abf3bd4ed
This closes one remaining race condition related to bug 12889: if
the thread already exited on the kernel side, returning ESRCH
is not correct because that error is reserved for the thread IDs
(pthread_t values) whose lifetime has ended. In case of a
kernel-side exit and a valid thread ID, no signal needs to be sent
and cancellation does not have an effect, so just return 0.
sysdeps/pthread/tst-kill4.c triggers undefined behavior and is
removed with this commit.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 8af8456004)
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* Test that pthread_kill succeeds for an exited thread.
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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 verifies that pthread_kill returns 0 (and not ESRCH) for
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a thread that has exited on the kernel side. */
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#include <stddef.h>
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#include <support/support.h>
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#include <support/xthread.h>
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static void *
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noop_thread (void *closure)
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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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pthread_t thr = xpthread_create (NULL, noop_thread, NULL);
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support_wait_for_thread_exit ();
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xpthread_cancel (thr);
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xpthread_join (thr);
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return 0;
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}
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#include <support/test-driver.c>
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