| /* 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.h" |
| #include "apr_private.h" |
| #include "apr_general.h" |
| #include "apr_strings.h" |
| #include "apr_arch_thread_mutex.h" |
| #include "apr_thread_cond.h" |
| #include "apr_portable.h" |
| |
| static apr_status_t thread_mutex_cleanup(void *data) |
| { |
| apr_thread_mutex_t *mutex = (apr_thread_mutex_t *)data; |
| |
| NXMutexFree(mutex->mutex); |
| return APR_SUCCESS; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex, |
| unsigned int flags, |
| apr_pool_t *pool) |
| { |
| apr_thread_mutex_t *new_mutex = NULL; |
| |
| /* XXX: Implement _UNNESTED flavor and favor _DEFAULT for performance |
| */ |
| if (flags & APR_THREAD_MUTEX_UNNESTED) { |
| return APR_ENOTIMPL; |
| } |
| new_mutex = (apr_thread_mutex_t *)apr_pcalloc(pool, sizeof(apr_thread_mutex_t)); |
| |
| if (new_mutex == NULL) { |
| return APR_ENOMEM; |
| } |
| new_mutex->pool = pool; |
| |
| new_mutex->mutex = NXMutexAlloc(NX_MUTEX_RECURSIVE, 0, NULL); |
| |
| if(new_mutex->mutex == NULL) |
| return APR_ENOMEM; |
| |
| if (flags & APR_THREAD_MUTEX_TIMED) { |
| apr_status_t rv = apr_thread_cond_create(&new_mutex->cond, pool); |
| if (rv != SUCCESS) { |
| NXMutexFree(new_mutex->mutex); |
| return rv; |
| } |
| } |
| |
| apr_pool_cleanup_register(new_mutex->pool, new_mutex, |
| (void*)thread_mutex_cleanup, |
| apr_pool_cleanup_null); |
| *mutex = new_mutex; |
| return APR_SUCCESS; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex) |
| { |
| if (mutex->cond) { |
| apr_status_t rv; |
| NXLock(mutex->mutex); |
| if (mutex->locked) { |
| mutex->num_waiters++; |
| rv = apr_thread_cond_wait(mutex->cond, mutex); |
| mutex->num_waiters--; |
| } |
| else { |
| mutex->locked = 1; |
| rv = APR_SUCCESS; |
| } |
| NXUnlock(mutex->mutex); |
| return rv; |
| } |
| |
| NXLock(mutex->mutex); |
| return APR_SUCCESS; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex) |
| { |
| if (mutex->cond) { |
| apr_status_t rv; |
| NXLock(mutex->mutex); |
| if (mutex->locked) { |
| rv = APR_EBUSY; |
| } |
| else { |
| mutex->locked = 1; |
| rv = APR_SUCCESS; |
| } |
| NXUnlock(mutex->mutex); |
| return rv; |
| } |
| |
| if (!NXTryLock(mutex->mutex)) |
| return APR_EBUSY; |
| return APR_SUCCESS; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_timedlock(apr_thread_mutex_t *mutex, |
| apr_time_t timeout, |
| int absolute) |
| { |
| if (mutex->cond) { |
| apr_status_t rv; |
| NXLock(mutex->mutex); |
| if (mutex->locked) { |
| mutex->num_waiters++; |
| if (timeout < 0) { |
| rv = apr_thread_cond_dwait(mutex->cond, mutex); |
| } |
| else { |
| if (absolute) { |
| apr_time_t now = apr_time_now(); |
| if (timeout > now) { |
| timeout -= now; |
| } |
| else { |
| timeout = 0; |
| } |
| } |
| rv = apr_thread_cond_timedwait(mutex->cond, mutex, timeout); |
| } |
| mutex->num_waiters--; |
| } |
| else { |
| mutex->locked = 1; |
| rv = APR_SUCCESS; |
| } |
| NXUnlock(mutex->mutex); |
| return rv; |
| } |
| |
| return APR_ENOTIMPL; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex) |
| { |
| if (mutex->cond) { |
| apr_status_t rv; |
| NXLock(mutex->mutex); |
| if (!mutex->locked) { |
| rv = APR_EINVAL; |
| } |
| else if (mutex->num_waiters) { |
| rv = apr_thread_cond_signal(mutex->cond); |
| } |
| else { |
| mutex->locked = 0; |
| rv = APR_SUCCESS; |
| } |
| NXUnlock(mutex->mutex); |
| return rv; |
| } |
| |
| NXUnlock(mutex->mutex); |
| return APR_SUCCESS; |
| } |
| |
| APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex) |
| { |
| apr_status_t stat, rv = APR_SUCCESS; |
| if (mutex->cond) { |
| rv = apr_thread_cond_destroy(mutex->cond); |
| mutex->cond = NULL; |
| } |
| stat = apr_pool_cleanup_run(mutex->pool, mutex, thread_mutex_cleanup); |
| if (stat == APR_SUCCESS && rv) { |
| stat = rv; |
| } |
| return stat; |
| } |
| |
| APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex) |
| |