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