gecko-dev/ipc/glue/SharedMemoryBasic_android.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_ipc_SharedMemoryBasic_android_h
#define mozilla_ipc_SharedMemoryBasic_android_h
#include "base/file_descriptor_posix.h"
#include "SharedMemory.h"
//
// This is a low-level wrapper around platform shared memory. Don't
// use it directly; use Shmem allocated through IPDL interfaces.
//
namespace mozilla {
namespace ipc {
class SharedMemoryBasic : public SharedMemory
{
public:
typedef base::FileDescriptor Handle;
SharedMemoryBasic();
SharedMemoryBasic(const Handle& aHandle);
virtual ~SharedMemoryBasic();
NS_OVERRIDE
virtual bool Create(size_t aNbytes);
NS_OVERRIDE
virtual bool Map(size_t nBytes);
NS_OVERRIDE
virtual void* memory() const
{
return mMemory;
}
NS_OVERRIDE
virtual SharedMemoryType Type() const
{
return TYPE_BASIC;
}
static Handle NULLHandle()
{
return Handle();
}
static bool IsHandleValid(const Handle &aHandle)
{
return aHandle.fd >= 0;
}
bool ShareToProcess(base::ProcessHandle aProcess,
Handle* aNewHandle);
private:
void Unmap();
void Destroy();
// The /dev/ashmem fd we allocate.
int mShmFd;
// Pointer to mapped region, null if unmapped.
void *mMemory;
};
} // namespace ipc
} // namespace mozilla
#endif // ifndef mozilla_ipc_SharedMemoryBasic_android_h