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125 lines
3.7 KiB
C++
125 lines
3.7 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 Code.
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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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* Chris Jones <jones.chris.g@gmail.com>
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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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#include <math.h>
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#include "nsString.h"
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#include "nsIMemoryReporter.h"
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#include "mozilla/ipc/SharedMemory.h"
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namespace mozilla {
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namespace ipc {
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static PRInt64 gShmemAllocated;
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static PRInt64 gShmemMapped;
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static PRInt64 GetShmemAllocated() { return gShmemAllocated; }
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static PRInt64 GetShmemMapped() { return gShmemMapped; }
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NS_MEMORY_REPORTER_IMPLEMENT(ShmemAllocated,
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"shmem-allocated",
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KIND_OTHER,
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UNITS_BYTES,
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GetShmemAllocated,
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"Memory shared with other processes that is accessible (but not "
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"necessarily mapped).")
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NS_MEMORY_REPORTER_IMPLEMENT(ShmemMapped,
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"shmem-mapped",
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KIND_OTHER,
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UNITS_BYTES,
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GetShmemMapped,
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"Memory shared with other processes that is mapped into the address space.")
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SharedMemory::SharedMemory()
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: mAllocSize(0)
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, mMappedSize(0)
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{
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// NB: SharedMemory is main-thread-only at the moment, but that may
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// change soon
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static bool registered;
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if (!registered) {
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NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemAllocated));
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NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemMapped));
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registered = true;
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}
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}
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/*static*/ size_t
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SharedMemory::PageAlignedSize(size_t aSize)
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{
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size_t pageSize = SystemPageSize();
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size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize)));
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return pageSize * nPagesNeeded;
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}
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void
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SharedMemory::Created(size_t aNBytes)
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{
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mAllocSize = aNBytes;
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gShmemAllocated += mAllocSize;
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}
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void
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SharedMemory::Mapped(size_t aNBytes)
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{
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mMappedSize = aNBytes;
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gShmemMapped += mMappedSize;
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}
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void
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SharedMemory::Unmapped()
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{
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NS_ABORT_IF_FALSE(gShmemMapped >= PRInt64(mMappedSize),
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"Can't unmap more than mapped");
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gShmemMapped -= mMappedSize;
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mMappedSize = 0;
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}
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/*static*/ void
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SharedMemory::Destroyed()
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{
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NS_ABORT_IF_FALSE(gShmemAllocated >= PRInt64(mAllocSize),
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"Can't destroy more than allocated");
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gShmemAllocated -= mAllocSize;
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mAllocSize = 0;
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}
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} // namespace ipc
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} // namespace mozilla
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