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91 lines
2.2 KiB
C++
91 lines
2.2 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#include "mozilla/Atomics.h"
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namespace mozilla {
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namespace ipc {
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static Atomic<size_t> gShmemAllocated;
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static Atomic<size_t> gShmemMapped;
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static size_t GetShmemAllocated() { return gShmemAllocated; }
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static size_t GetShmemMapped() { return gShmemMapped; }
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NS_THREADSAFE_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_THREADSAFE_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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static Atomic<uint32_t> registered;
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if (registered.compareExchange(0, 1)) {
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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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}
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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 >= 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 >= 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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