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-rw-r--r--locks/unix/thread_rwlock.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/locks/unix/thread_rwlock.c b/locks/unix/thread_rwlock.c
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+++ b/locks/unix/thread_rwlock.c
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_thread_rwlock.h"
+#include "apr_private.h"
+
+#if APR_HAS_THREADS
+
+#ifdef HAVE_PTHREAD_RWLOCKS
+
+/* The rwlock must be initialized but not locked by any thread when
+ * cleanup is called. */
+static apr_status_t thread_rwlock_cleanup(void *data)
+{
+ apr_thread_rwlock_t *rwlock = (apr_thread_rwlock_t *)data;
+ apr_status_t stat;
+
+ stat = pthread_rwlock_destroy(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
+ apr_pool_t *pool)
+{
+ apr_thread_rwlock_t *new_rwlock;
+ apr_status_t stat;
+
+ new_rwlock = apr_palloc(pool, sizeof(apr_thread_rwlock_t));
+ new_rwlock->pool = pool;
+
+ if ((stat = pthread_rwlock_init(&new_rwlock->rwlock, NULL))) {
+#ifdef HAVE_ZOS_PTHREADS
+ stat = errno;
+#endif
+ return stat;
+ }
+
+ apr_pool_cleanup_register(new_rwlock->pool,
+ (void *)new_rwlock, thread_rwlock_cleanup,
+ apr_pool_cleanup_null);
+
+ *rwlock = new_rwlock;
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
+{
+ apr_status_t stat;
+
+ stat = pthread_rwlock_rdlock(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
+{
+ apr_status_t stat;
+
+ stat = pthread_rwlock_tryrdlock(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ /* Normalize the return code. */
+ if (stat == EBUSY)
+ stat = APR_EBUSY;
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
+{
+ apr_status_t stat;
+
+ stat = pthread_rwlock_wrlock(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
+{
+ apr_status_t stat;
+
+ stat = pthread_rwlock_trywrlock(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ /* Normalize the return code. */
+ if (stat == EBUSY)
+ stat = APR_EBUSY;
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
+{
+ apr_status_t stat;
+
+ stat = pthread_rwlock_unlock(&rwlock->rwlock);
+#ifdef HAVE_ZOS_PTHREADS
+ if (stat) {
+ stat = errno;
+ }
+#endif
+ return stat;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
+{
+ return apr_pool_cleanup_run(rwlock->pool, rwlock, thread_rwlock_cleanup);
+}
+
+#else /* HAVE_PTHREAD_RWLOCKS */
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
+ apr_pool_t *pool)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
+{
+ return APR_ENOTIMPL;
+}
+
+#endif /* HAVE_PTHREAD_RWLOCKS */
+APR_POOL_IMPLEMENT_ACCESSOR(thread_rwlock)
+
+#endif /* APR_HAS_THREADS */