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136 lines
3.5 KiB
C++
136 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla IPC.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_ipc_SharedMemoryBasic_h
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#define mozilla_ipc_SharedMemoryBasic_h
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#include "base/shared_memory.h"
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#include "SharedMemory.h"
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#include "nsDebug.h"
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//
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// This is a low-level wrapper around platform shared memory. Don't
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// use it directly; use Shmem allocated through IPDL interfaces.
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//
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namespace mozilla {
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namespace ipc {
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class SharedMemoryBasic : public SharedMemory
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{
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public:
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typedef base::SharedMemoryHandle Handle;
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SharedMemoryBasic() :
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mSize(0)
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{
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}
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SharedMemoryBasic(const Handle& aHandle) :
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mSharedMemory(aHandle, false),
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mSize(0)
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{
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}
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NS_OVERRIDE
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virtual bool Create(size_t aNbytes)
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{
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return mSharedMemory.Create("", false, false, aNbytes);
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}
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NS_OVERRIDE
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virtual bool Map(size_t nBytes)
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{
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bool ok = mSharedMemory.Map(nBytes);
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if (ok)
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mSize = nBytes;
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return ok;
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}
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NS_OVERRIDE
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virtual size_t Size() const
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{
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return mSize;
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}
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NS_OVERRIDE
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virtual void* memory() const
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{
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return mSharedMemory.memory();
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}
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NS_OVERRIDE
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virtual SharedMemoryType Type() const
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{
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return TYPE_BASIC;
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}
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static Handle NULLHandle()
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{
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return base::SharedMemory::NULLHandle();
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}
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static bool IsHandleValid(const Handle &aHandle)
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{
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return base::SharedMemory::IsHandleValid(aHandle);
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}
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bool ShareToProcess(base::ProcessHandle process,
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Handle* new_handle)
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{
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base::SharedMemoryHandle handle;
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bool ret = mSharedMemory.ShareToProcess(process, &handle);
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if (ret)
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*new_handle = handle;
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return ret;
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}
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private:
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base::SharedMemory mSharedMemory;
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// NB: we have to track this because shared_memory_win.cc doesn't
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size_t mSize;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // ifndef mozilla_ipc_SharedMemoryBasic_h
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