abstract_shared_mem.h

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// Copyright 2011 Google Inc.

#ifndef PAGESPEED_KERNEL_BASE_ABSTRACT_SHARED_MEM_H_
#define PAGESPEED_KERNEL_BASE_ABSTRACT_SHARED_MEM_H_

#include <cstddef>
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"

namespace net_instaweb {

class AbstractMutex;
class MessageHandler;

class AbstractSharedMemSegment {
 public:
  AbstractSharedMemSegment() {}

  virtual ~AbstractSharedMemSegment();

  virtual volatile char* Base() = 0;

  virtual size_t SharedMutexSize() const = 0;

  virtual bool InitializeSharedMutex(size_t offset,
                                     MessageHandler* handler) = 0;
  virtual AbstractMutex* AttachToSharedMutex(size_t offset) = 0;

 private:
  
};

class AbstractSharedMem {
 public:
  AbstractSharedMem() {}
  virtual ~AbstractSharedMem();

  virtual size_t SharedMutexSize() const = 0;

  virtual AbstractSharedMemSegment* CreateSegment(
      const GoogleString& name, size_t size, MessageHandler* handler) = 0;

  virtual AbstractSharedMemSegment* AttachToSegment(
      const GoogleString& name, size_t size, MessageHandler* handler) = 0;

  virtual void DestroySegment(const GoogleString& name,
                              MessageHandler* handler) = 0;

  virtual bool IsDummy() { return false; }

 private:
  
};

}  

#endif