shared_cond.hpp

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/*
 * Copyright (c) 2014-2015, Hewlett-Packard Development Company, LP.
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for
 * more details. You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * HP designates this particular file as subject to the "Classpath" exception
 * as provided by HP in the LICENSE.txt file that accompanied this code.
 */
#ifndef FOEDUS_SOC_SHARED_COND_HPP_
#define FOEDUS_SOC_SHARED_COND_HPP_

#include <pthread.h>
#include <stdint.h>

#include "foedus/cxx11.hpp"
#include "foedus/soc/shared_mutex.hpp"
#include "foedus/soc/shared_polling.hpp"

namespace foedus {
namespace soc {
class SharedCond CXX11_FINAL {
 public:
  SharedCond() : initialized_(false), waiters_(0), notifiers_(0) { initialize(); }
  ~SharedCond() { uninitialize(); }

  // Disable copy constructors
  SharedCond(const SharedCond&) CXX11_FUNC_DELETE;
  SharedCond& operator=(const SharedCond&) CXX11_FUNC_DELETE;

  void initialize();
  void uninitialize();
  bool is_initialized() const { return initialized_; }

  void wait(SharedMutexScope* scope);

  bool timedwait(SharedMutexScope* scope, uint64_t timeout_nanosec);

  void broadcast(SharedMutexScope* scope);

  void broadcast_nolock();

  void signal(SharedMutexScope* scope);

  SharedMutex* get_mutex() { return &mutex_; }

  bool exists_waiters() const { return waiters_ != 0; }

 private:
  bool                initialized_;

  SharedMutex         mutex_;
  pthread_cond_t      cond_;
  pthread_condattr_t  attr_;
  uint32_t            waiters_;
  uint32_t            notifiers_;

  void common_assert(SharedMutexScope* scope);
};

}  // namespace soc
}  // namespace foedus
#endif  // FOEDUS_SOC_SHARED_COND_HPP_