cnstream/easydk/dist/include/util/cnstream_rwlock.hpp

/*************************************************************************
 * Copyright (C) [2019] by Cambricon, Inc. All rights reserved
 *
 *  Licensed 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
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *************************************************************************/
#ifndef CNSTREAM_RWLOCK_H_
#define CNSTREAM_RWLOCK_H_

#include <pthread.h>  // for pthread_rwlock_t
#include <memory>
#include <utility>

namespace cnstream {

// FIXME
class RwLock {
 public:
  RwLock() { pthread_rwlock_init(&rwlock, NULL); }
  ~RwLock() { pthread_rwlock_destroy(&rwlock); }
  void wrlock() { pthread_rwlock_wrlock(&rwlock); }
  void rdlock() { pthread_rwlock_rdlock(&rwlock); }
  void unlock() { pthread_rwlock_unlock(&rwlock); }

 private:
  pthread_rwlock_t rwlock;
};

class RwLockWriteGuard {
 public:
  explicit RwLockWriteGuard(RwLock& lock) : lock_(lock) { lock_.wrlock(); }
  ~RwLockWriteGuard() { lock_.unlock(); }

 private:
  RwLock& lock_;
};

class RwLockReadGuard {
 public:
  explicit RwLockReadGuard(RwLock& lock) : lock_(lock) { lock_.rdlock(); }
  ~RwLockReadGuard() { lock_.unlock(); }

 private:
  RwLock& lock_;
};

} /* namespace cnstream */

#endif /* CNSTREAM_RWLOCK_H_ */