thread_synchronizer.h

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/*
 * Copyright 2012 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_THREAD_THREAD_SYNCHRONIZER_H__
#define PAGESPEED_KERNEL_THREAD_THREAD_SYNCHRONIZER_H__

#include <map>

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"

namespace net_instaweb {

class AbstractMutex;
class ThreadSystem;
class Timer;

class ThreadSynchronizer {
 public:
  explicit ThreadSynchronizer(ThreadSystem* thread_system);
  ~ThreadSynchronizer();

  void EnableForPrefix(StringPiece prefix) {
    enabled_ = true;
    prefix.CopyToString(StringVectorAdd(&prefixes_));
  }

  void Wait(const char* key) {
    if (enabled_) {
      DoWait(key);
    }
  }

  void TimedWait(const char* key, int64 timeout_ms) {
    if (enabled_) {
      DoTimedWait(key, timeout_ms);
    }
  }

  void Signal(const char* key) {
    if (enabled_) {
      DoSignal(key);
    }
  }

  void AllowSloppyTermination(const char* key);

 private:
  class SyncPoint;
  typedef std::map<GoogleString, SyncPoint*> SyncMap;

  SyncPoint* GetSyncPoint(const GoogleString& key);
  void DoWait(const char* key);
  void DoTimedWait(const char* key, int64 timeout_ms);
  void DoSignal(const char* key);
  bool MatchesPrefix(const char* key) const;

  bool enabled_;
  ThreadSystem* thread_system_;
  SyncMap sync_map_;
  scoped_ptr<AbstractMutex> map_mutex_;
  scoped_ptr<Timer> timer_;
  StringVector prefixes_;

  
};

}  

#endif