summaryrefslogtreecommitdiffstats
path: root/locks/beos/thread_cond.c
diff options
context:
space:
mode:
Diffstat (limited to 'locks/beos/thread_cond.c')
-rw-r--r--locks/beos/thread_cond.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/locks/beos/thread_cond.c b/locks/beos/thread_cond.c
new file mode 100644
index 0000000..a0978c0
--- /dev/null
+++ b/locks/beos/thread_cond.c
@@ -0,0 +1,186 @@
+/* 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_mutex.h"
+#include "apr_arch_thread_cond.h"
+#include "apr_strings.h"
+#include "apr_portable.h"
+
+static apr_status_t thread_cond_cleanup(void *data)
+{
+ struct waiter *w;
+ apr_thread_cond_t *cond = (apr_thread_cond_t *)data;
+
+ acquire_sem(cond->lock);
+ delete_sem(cond->lock);
+
+ return APR_SUCCESS;
+}
+
+static struct waiter_t *make_waiter(apr_pool_t *pool)
+{
+ struct waiter_t *w = (struct waiter_t*)
+ apr_palloc(pool, sizeof(struct waiter_t));
+ if (w == NULL)
+ return NULL;
+
+ w->sem = create_sem(0, "apr conditional waiter");
+ if (w->sem < 0)
+ return NULL;
+
+ APR_RING_ELEM_INIT(w, link);
+
+ return w;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t **cond,
+ apr_pool_t *pool)
+{
+ apr_thread_cond_t *new_cond;
+ sem_id rv;
+ int i;
+
+ new_cond = (apr_thread_cond_t *)apr_palloc(pool, sizeof(apr_thread_cond_t));
+
+ if (new_cond == NULL)
+ return APR_ENOMEM;
+
+ if ((rv = create_sem(1, "apr conditional lock")) < B_OK)
+ return rv;
+
+ new_cond->lock = rv;
+ new_cond->pool = pool;
+ APR_RING_INIT(&new_cond->alist, waiter_t, link);
+ APR_RING_INIT(&new_cond->flist, waiter_t, link);
+
+ for (i=0;i < 10 ;i++) {
+ struct waiter_t *nw = make_waiter(pool);
+ APR_RING_INSERT_TAIL(&new_cond->flist, nw, waiter_t, link);
+ }
+
+ apr_pool_cleanup_register(new_cond->pool,
+ (void *)new_cond, thread_cond_cleanup,
+ apr_pool_cleanup_null);
+
+ *cond = new_cond;
+ return APR_SUCCESS;
+}
+
+
+static apr_status_t do_wait(apr_thread_cond_t *cond, apr_thread_mutex_t *mutex,
+ apr_interval_time_t timeout)
+{
+ struct waiter_t *wait;
+ thread_id cth = find_thread(NULL);
+ apr_status_t rv;
+ int flags = B_RELATIVE_TIMEOUT;
+
+ /* We must be the owner of the mutex or we can't do this... */
+ if (mutex->owner != cth) {
+ /* What should we return??? */
+ return APR_EINVAL;
+ }
+
+ acquire_sem(cond->lock);
+ wait = APR_RING_FIRST(&cond->flist);
+ if (wait)
+ APR_RING_REMOVE(wait, link);
+ else
+ wait = make_waiter(cond->pool);
+ APR_RING_INSERT_TAIL(&cond->alist, wait, waiter_t, link);
+ cond->condlock = mutex;
+ release_sem(cond->lock);
+
+ apr_thread_mutex_unlock(cond->condlock);
+
+ if (timeout == 0)
+ flags = 0;
+
+ rv = acquire_sem_etc(wait->sem, 1, flags, timeout);
+
+ apr_thread_mutex_lock(cond->condlock);
+
+ if (rv != B_OK) {
+ if (rv == B_TIMED_OUT)
+ return APR_TIMEUP;
+ return rv;
+ }
+
+ acquire_sem(cond->lock);
+ APR_RING_REMOVE(wait, link);
+ APR_RING_INSERT_TAIL(&cond->flist, wait, waiter_t, link);
+ release_sem(cond->lock);
+
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t *cond,
+ apr_thread_mutex_t *mutex)
+{
+ return do_wait(cond, mutex, 0);
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t *cond,
+ apr_thread_mutex_t *mutex,
+ apr_interval_time_t timeout)
+{
+ return do_wait(cond, mutex, timeout);
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t *cond)
+{
+ struct waiter_t *wake;
+
+ acquire_sem(cond->lock);
+ if (!APR_RING_EMPTY(&cond->alist, waiter_t, link)) {
+ wake = APR_RING_FIRST(&cond->alist);
+ APR_RING_REMOVE(wake, link);
+ release_sem(wake->sem);
+ APR_RING_INSERT_TAIL(&cond->flist, wake, waiter_t, link);
+ }
+ release_sem(cond->lock);
+
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t *cond)
+{
+ struct waiter_t *wake;
+
+ acquire_sem(cond->lock);
+ while (! APR_RING_EMPTY(&cond->alist, waiter_t, link)) {
+ wake = APR_RING_FIRST(&cond->alist);
+ APR_RING_REMOVE(wake, link);
+ release_sem(wake->sem);
+ APR_RING_INSERT_TAIL(&cond->flist, wake, waiter_t, link);
+ }
+ release_sem(cond->lock);
+
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_thread_cond_destroy(apr_thread_cond_t *cond)
+{
+ apr_status_t stat;
+ if ((stat = thread_cond_cleanup(cond)) == APR_SUCCESS) {
+ apr_pool_cleanup_kill(cond->pool, cond, thread_cond_cleanup);
+ return APR_SUCCESS;
+ }
+ return stat;
+}
+
+APR_POOL_IMPLEMENT_ACCESSOR(thread_cond)
+