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-rw-r--r--htl/tests/test-11.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/htl/tests/test-11.c b/htl/tests/test-11.c
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+/* Test rwlocks.
+ Copyright (C) 2000-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#define _GNU_SOURCE
+
+#include <pthread.h>
+#include <assert.h>
+#include <error.h>
+#include <errno.h>
+
+#define THREADS 1
+
+int a;
+int b;
+
+/* Get a read lock and assert that a == b. */
+void *
+test1 (void *arg)
+{
+ error_t err;
+ pthread_rwlock_t *lock = arg;
+ int i;
+
+ for (i = 0; i < 200; i++)
+ {
+ err = pthread_rwlock_rdlock (lock);
+ assert (err == 0);
+
+ assert (a == b);
+
+ sched_yield ();
+
+ assert (a == b);
+
+ err = pthread_rwlock_unlock (lock);
+ assert (err == 0);
+ }
+
+ return 0;
+}
+
+int
+main (int argc, char **argv)
+{
+ error_t err;
+ pthread_rwlockattr_t attr;
+ pthread_rwlock_t lock;
+ int pshared;
+
+ int i;
+ pthread_t tid[THREADS];
+ void *ret;
+
+ err = pthread_rwlockattr_init (&attr);
+ if (err)
+ error (1, err, "pthread_rwlockattr_init");
+
+ err = pthread_rwlockattr_getpshared (&attr, &pshared);
+ if (err)
+ error (1, err, "pthread_rwlockattr_getpshared");
+
+ /* Assert the default state as mandated by POSIX. */
+ assert (pshared == PTHREAD_PROCESS_PRIVATE);
+
+ err = pthread_rwlockattr_setpshared (&attr, pshared);
+ if (err)
+ error (1, err, "pthread_rwlockattr_setpshared");
+
+ err = pthread_rwlock_init (&lock, &attr);
+ if (err)
+ error (1, err, "pthread_rwlock_init");
+
+ err = pthread_rwlockattr_destroy (&attr);
+ if (err)
+ error (1, err, "pthread_rwlockattr_destroy");
+
+ /* Now test the lock. */
+
+ for (i = 0; i < THREADS; i++)
+ {
+ err = pthread_create (&tid[i], 0, test1, &lock);
+ if (err)
+ error (1, err, "pthread_create");
+ }
+
+ for (i = 0; i < 10; i++)
+ {
+ sched_yield ();
+
+ /* Get a write lock. */
+ pthread_rwlock_wrlock (&lock);
+ /* Increment a and b giving other threads a chance to run in
+ between. */
+ sched_yield ();
+ a++;
+ sched_yield ();
+ b++;
+ sched_yield ();
+ /* Unlock. */
+ pthread_rwlock_unlock (&lock);
+ }
+
+ for (i = 0; i < THREADS; i++)
+ {
+ err = pthread_join (tid[i], &ret);
+ if (err)
+ error (1, err, "pthread_join");
+ }
+
+ /* Read lock it. */
+ err = pthread_rwlock_tryrdlock (&lock);
+ assert (err == 0);
+
+ /* Try to write lock it. It should fail with EBUSY. */
+ err = pthread_rwlock_trywrlock (&lock);
+ assert (err == EBUSY);
+
+ /* Drop the read lock. */
+ err = pthread_rwlock_unlock (&lock);
+ assert (err == 0);
+
+ /* Get a write lock. */
+ err = pthread_rwlock_trywrlock (&lock);
+ assert (err == 0);
+
+ /* Fail trying to acquire another write lock. */
+ err = pthread_rwlock_trywrlock (&lock);
+ assert (err == EBUSY);
+
+ /* Try to get a read lock which should also fail. */
+ err = pthread_rwlock_tryrdlock (&lock);
+ assert (err == EBUSY);
+
+ /* Unlock it. */
+ err = pthread_rwlock_unlock (&lock);
+ assert (err == 0);
+
+
+ err = pthread_rwlock_destroy (&lock);
+ if (err)
+ error (1, err, "pthread_rwlock_destroy");
+
+ return 0;
+}