1 files changed, 87 insertions, 0 deletions
diff --git a/dom/plugins/ipc/MiniShmParent.h b/dom/plugins/ipc/MiniShmParent.h
new file mode 100644
index 0000000000..06eec62560
--- /dev/null
+++ b/dom/plugins/ipc/MiniShmParent.h
@@ -0,0 +1,87 @@
+/* -*- 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