FileHandleWrapper.h

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/* 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 _include_gfx_ipc_FileHandleWrapper_h_

#define _include_gfx_ipc_FileHandleWrapper_h_

#include "mozilla/UniquePtrExtensions.h"

#include "nsISupportsImpl.h"

namespace IPC {

template <typename P>

struct ParamTraits;

namespace mozilla {

namespace gfx {

//

// A class for sharing file handle or shared handle among multiple clients.

//

// The file handles or the shared handles consume system resources. The class

// could reduce the number of shared handles in a process.

//

class FileHandleWrapper {

  friend struct IPC::ParamTraits<gfx::FileHandleWrapper*>;

 public:

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FileHandleWrapper);

  explicit FileHandleWrapper(mozilla::UniqueFileHandle&& aHandle);

  mozilla::detail::FileHandleType GetHandle();

  mozilla::UniqueFileHandle ClonePlatformHandle();

 protected:

  ~FileHandleWrapper();

  const mozilla::UniqueFileHandle mHandle;

};

}  // namespace gfx

}  // namespace mozilla

#endif  // _include_gfx_ipc_FileHandleWrapper_h_