gecko/ipc/glue/SharedMemoryBasic.h
Joe Drew ext:(%20and%20Chris%20Jones%20%3Cjones.chris.g%40gmail.com%3E) 8ed356359a Bug 548437: Add a SysV shmem subtype of SharedMemory. r=dougt
2010-04-16 00:29:16 -05:00

136 lines
3.5 KiB
C++

/* -*- 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 IPC.
*
* 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):
*
* 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
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* 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
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*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_ipc_SharedMemoryBasic_h
#define mozilla_ipc_SharedMemoryBasic_h
#include "base/shared_memory.h"
#include "SharedMemory.h"
#include "nsDebug.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::SharedMemoryHandle Handle;
SharedMemoryBasic() :
mSize(0)
{
}
SharedMemoryBasic(const Handle& aHandle) :
mSharedMemory(aHandle, false),
mSize(0)
{
}
NS_OVERRIDE
virtual bool Create(size_t aNbytes)
{
return mSharedMemory.Create("", false, false, aNbytes);
}
NS_OVERRIDE
virtual bool Map(size_t nBytes)
{
bool ok = mSharedMemory.Map(nBytes);
if (ok)
mSize = nBytes;
return ok;
}
NS_OVERRIDE
virtual size_t Size() const
{
return mSize;
}
NS_OVERRIDE
virtual void* memory() const
{
return mSharedMemory.memory();
}
NS_OVERRIDE
virtual SharedMemoryType Type() const
{
return TYPE_BASIC;
}
static Handle NULLHandle()
{
return base::SharedMemory::NULLHandle();
}
static bool IsHandleValid(const Handle &aHandle)
{
return base::SharedMemory::IsHandleValid(aHandle);
}
bool ShareToProcess(base::ProcessHandle process,
Handle* new_handle)
{
base::SharedMemoryHandle handle;
bool ret = mSharedMemory.ShareToProcess(process, &handle);
if (ret)
*new_handle = handle;
return ret;
}
private:
base::SharedMemory mSharedMemory;
// NB: we have to track this because shared_memory_win.cc doesn't
size_t mSize;
};
} // namespace ipc
} // namespace mozilla
#endif // ifndef mozilla_ipc_SharedMemoryBasic_h