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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_plugins_MiniShmParent_h
#define mozilla_plugins_MiniShmParent_h
#include "MiniShmBase.h"
#include <string>
namespace mozilla {
namespace plugins {
/**
* This class provides a lightweight shared memory interface for a parent
* process in Win32.
* This code assumes that there is a parent-child relationship between
* processes, as it creates inheritable handles.
* Note that this class is *not* an IPDL actor.
*
* @see MiniShmChild
*/
class MiniShmParent : public MiniShmBase
{
public:
MiniShmParent();
virtual ~MiniShmParent();
static const unsigned int kDefaultMiniShmSectionSize;
/**
* Initialize shared memory on the parent side.
*
* @param aObserver A MiniShmObserver object to receive event notifications.
* @param aTimeout Timeout in milliseconds.
* @param aSectionSize Desired size of the shared memory section. This is
* expected to be a multiple of 0x1000 (4KiB).
* @return nsresult error code
*/
nsresult
Init(MiniShmObserver* aObserver, const DWORD aTimeout,
const unsigned int aSectionSize = kDefaultMiniShmSectionSize);
/**
* Destroys the shared memory section. Useful to explicitly release
* resources if it is known that they won't be needed again.
*/
void
CleanUp();
/**
* Provides a cookie string that should be passed to MiniShmChild
* during its initialization.
*
* @param aCookie A std::wstring variable to receive the cookie.
* @return nsresult error code
*/
nsresult
GetCookie(std::wstring& aCookie);
virtual nsresult
Send() override;
bool
IsConnected() const;
protected:
void
OnEvent() override;
private:
void
FinalizeConnection();
unsigned int mSectionSize;
HANDLE mParentEvent;
HANDLE mParentGuard;
HANDLE mChildEvent;
HANDLE mChildGuard;
HANDLE mRegWait;
HANDLE mFileMapping;
LPVOID mView;
bool mIsConnected;
DWORD mTimeout;
DISALLOW_COPY_AND_ASSIGN(MiniShmParent);
};
} // namespace plugins
} // namespace mozilla
#endif // mozilla_plugins_MiniShmParent_h
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