shared_mem_lock_manager.h

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/*
 * Copyright 2011 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_SHAREDMEM_SHARED_MEM_LOCK_MANAGER_H_
#define PAGESPEED_KERNEL_SHAREDMEM_SHARED_MEM_LOCK_MANAGER_H_

#include <cstddef>

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

namespace net_instaweb {

class AbstractSharedMem;
class AbstractSharedMemSegment;
class Hasher;
class MessageHandler;
class Scheduler;

namespace SharedMemLockData {

struct Bucket;

}  

class SharedMemLockManager : public NamedLockManager {
 public:
  SharedMemLockManager(
      AbstractSharedMem* shm, const GoogleString& path, Scheduler* scheduler,
      Hasher* hasher, MessageHandler* handler);
  virtual ~SharedMemLockManager();

  bool Initialize();

  bool Attach();

  static void GlobalCleanup(AbstractSharedMem* shm, const GoogleString& path,
                            MessageHandler* message_handler);

  virtual SchedulerBasedAbstractLock* CreateNamedLock(const StringPiece& name);

 private:
  friend class SharedMemLock;

  SharedMemLockData::Bucket* Bucket(size_t bucket);

  size_t MutexOffset(SharedMemLockData::Bucket*);

  AbstractSharedMem* shm_runtime_;
  GoogleString path_;

  scoped_ptr<AbstractSharedMemSegment> seg_;
  Scheduler* scheduler_;
  Hasher* hasher_;
  MessageHandler* handler_;
  size_t lock_size_;

  
};

}  

#endif