110 lines
3.3 KiB
Diff
110 lines
3.3 KiB
Diff
commit 3c2b9dc41cd05da055fae6f793a355063156bdf3
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Author: Joseph Myers <josmyers@redhat.com>
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Date: Fri Nov 29 20:25:04 2024 +0000
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Add threaded test of sem_trywait
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All the existing glibc tests of sem_trywait are single-threaded. Add
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one that calls sem_trywait and sem_post in separate threads.
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Tested for x86_64.
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Conflicts:
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sysdeps/pthread/Makefile (add new test)
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diff --git a/sysdeps/pthread/Makefile b/sysdeps/pthread/Makefile
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index 6355e94171fbcdc3..5a1b26fa3c0e6061 100644
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--- a/sysdeps/pthread/Makefile
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+++ b/sysdeps/pthread/Makefile
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@@ -128,6 +128,7 @@ tests += tst-cnd-basic tst-mtx-trylock tst-cnd-broadcast \
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tst-pthread_kill-exiting \
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tst-cancel30 \
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tst-spin5 \
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+ tst-sem19 \
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# tests
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tests-time64 := \
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diff --git a/sysdeps/pthread/tst-sem19.c b/sysdeps/pthread/tst-sem19.c
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new file mode 100644
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index 0000000000000000..9ef461e008ab9eab
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--- /dev/null
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+++ b/sysdeps/pthread/tst-sem19.c
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@@ -0,0 +1,77 @@
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+/* Test sem_trywait with threads.
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+ Copyright (C) 2024 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+#include <errno.h>
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+#include <pthread.h>
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+#include <semaphore.h>
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+#include <support/check.h>
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+#include <support/xthread.h>
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+
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+/* The test uses two threads, the main thread and a newly created
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+ thread to test the operation of sem_trywait in a threaded scenario.
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+ The intent is to test sem_trywait when it would return EAGAIN, and
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+ then again after the critical section in the new thread has posted
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+ to the semaphore and the main thread succeeds in calling
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+ sem_trywait. It is possible this test fails with a timeout if the
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+ second thread takes longer than the test timeout to acquire the
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+ lock, and post. */
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+
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+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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+static sem_t sem;
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+
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+static void *
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+tf (void *arg)
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+{
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+ xpthread_mutex_lock (&lock);
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+ sem_post (&sem);
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+ xpthread_mutex_unlock (&lock);
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+ return NULL;
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+}
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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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+ int ret;
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+
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+ ret = sem_init (&sem, 0, 0);
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+ TEST_VERIFY_EXIT (ret == 0);
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+ xpthread_mutex_lock (&lock);
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+ pthread_t th = xpthread_create (NULL, tf, NULL);
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+ errno = 0;
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+ /* The other thread is waiting on the lock before it calls sem_post,
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+ so sem_trywait should fail. */
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+ ret = sem_trywait (&sem);
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+ TEST_COMPARE (ret, -1);
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+ TEST_COMPARE (errno, EAGAIN);
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+ xpthread_mutex_unlock (&lock);
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+ /* The other thread now takes the lock, calls sem_post and releases
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+ the lock. */
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+ for (;;)
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+ {
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+ errno = 0;
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+ ret = sem_trywait (&sem);
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+ if (ret == 0)
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+ break;
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+ TEST_COMPARE (errno, EAGAIN);
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+ }
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+ xpthread_join (th);
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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