mem_lock_manager.h

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/*
 * Copyright 2015 Google Inc.
 *
 * 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
 *
 * 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.
 */


#ifndef PAGESPEED_KERNEL_BASE_MEM_LOCK_MANAGER_H_
#define PAGESPEED_KERNEL_BASE_MEM_LOCK_MANAGER_H_

#include <map>

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/named_lock_manager.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/timer.h"
#include "pagespeed/kernel/util/mem_lock.h"
#include "pagespeed/kernel/util/mem_lock_state.h"

namespace net_instaweb {

class MemLockManager : public NamedLockManager {
 public:
  static const int64 kNoWakeupsPending = -1;

  explicit MemLockManager(Timer* timer);
  virtual ~MemLockManager();
  virtual NamedLock* CreateNamedLock(const StringPiece& name);

  int64 NextWakeupTimeMs() const;

  void Wakeup();

  Timer* timer() const { return timer_; }

  bool IsHeldInOrderedSet(MemLock* lock) const;

 private:
  typedef std::map<StringPiece, MemLockState*> MemLockStateMap;

  void RemoveLockState(MemLockState* lock_state);
  void AddPendingLock(MemLock* lock);
  void RemovePendingLock(MemLock* lock);

  friend class MemLockState;

  MemLockStateMap lock_state_map_;

  MemLockState::WakeupOrderedLockSet pending_locks_;

  Timer* timer_;
  int64 sequence_;
};

}  

#endif