import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/plugins/ipc/hangui/MiniShmChild.h

@@ -0,0 +1,68 @@
+/* -*- 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_MiniShmChild_h
+#define mozilla_plugins_MiniShmChild_h
+
+#include "MiniShmBase.h"
+
+#include <string>
+
+namespace mozilla {
+namespace plugins {
+
+/**
+ * This class provides a lightweight shared memory interface for a child 
+ * process in Win32.
+ * This code assumes that there is a parent-child relationship between 
+ * processes, as it inherits handles from the parent process.
+ * Note that this class is *not* an IPDL actor.
+ *
+ * @see MiniShmParent
+ */
+class MiniShmChild : public MiniShmBase
+{
+public:
+  MiniShmChild();
+  virtual ~MiniShmChild();
+
+  /**
+   * Initialize shared memory on the child side.
+   *
+   * @param aObserver A MiniShmObserver object to receive event notifications.
+   * @param aCookie Cookie obtained from MiniShmParent::GetCookie
+   * @param aTimeout Timeout in milliseconds.
+   * @return nsresult error code
+   */
+  nsresult
+  Init(MiniShmObserver* aObserver, const std::wstring& aCookie,
+       const DWORD aTimeout);
+
+  virtual nsresult
+  Send() override;
+
+protected:
+  void
+  OnEvent() override;
+
+private:
+  HANDLE mParentEvent;
+  HANDLE mParentGuard;
+  HANDLE mChildEvent;
+  HANDLE mChildGuard;
+  HANDLE mFileMapping;
+  HANDLE mRegWait;
+  LPVOID mView;
+  DWORD  mTimeout;
+
+  DISALLOW_COPY_AND_ASSIGN(MiniShmChild);
+};
+
+} // namespace plugins
+} // namespace mozilla
+
+#endif // mozilla_plugins_MiniShmChild_h
+