зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
2.2 KiB
C++
91 строка
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* vim: sw=2 ts=8 et :
|
|
*/
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include <math.h>
|
|
|
|
#include "nsString.h"
|
|
#include "nsIMemoryReporter.h"
|
|
#include "mozilla/ipc/SharedMemory.h"
|
|
#include "mozilla/Atomics.h"
|
|
|
|
namespace mozilla {
|
|
namespace ipc {
|
|
|
|
static Atomic<size_t> gShmemAllocated;
|
|
static Atomic<size_t> gShmemMapped;
|
|
static size_t GetShmemAllocated() { return gShmemAllocated; }
|
|
static size_t GetShmemMapped() { return gShmemMapped; }
|
|
|
|
NS_THREADSAFE_MEMORY_REPORTER_IMPLEMENT(ShmemAllocated,
|
|
"shmem-allocated",
|
|
KIND_OTHER,
|
|
UNITS_BYTES,
|
|
GetShmemAllocated,
|
|
"Memory shared with other processes that is accessible (but not "
|
|
"necessarily mapped).")
|
|
|
|
NS_THREADSAFE_MEMORY_REPORTER_IMPLEMENT(ShmemMapped,
|
|
"shmem-mapped",
|
|
KIND_OTHER,
|
|
UNITS_BYTES,
|
|
GetShmemMapped,
|
|
"Memory shared with other processes that is mapped into the address space.")
|
|
|
|
SharedMemory::SharedMemory()
|
|
: mAllocSize(0)
|
|
, mMappedSize(0)
|
|
{
|
|
static Atomic<uint32_t> registered;
|
|
if (registered.compareExchange(0, 1)) {
|
|
NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemAllocated));
|
|
NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemMapped));
|
|
}
|
|
}
|
|
|
|
/*static*/ size_t
|
|
SharedMemory::PageAlignedSize(size_t aSize)
|
|
{
|
|
size_t pageSize = SystemPageSize();
|
|
size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize)));
|
|
return pageSize * nPagesNeeded;
|
|
}
|
|
|
|
void
|
|
SharedMemory::Created(size_t aNBytes)
|
|
{
|
|
mAllocSize = aNBytes;
|
|
gShmemAllocated += mAllocSize;
|
|
}
|
|
|
|
void
|
|
SharedMemory::Mapped(size_t aNBytes)
|
|
{
|
|
mMappedSize = aNBytes;
|
|
gShmemMapped += mMappedSize;
|
|
}
|
|
|
|
void
|
|
SharedMemory::Unmapped()
|
|
{
|
|
NS_ABORT_IF_FALSE(gShmemMapped >= mMappedSize,
|
|
"Can't unmap more than mapped");
|
|
gShmemMapped -= mMappedSize;
|
|
mMappedSize = 0;
|
|
}
|
|
|
|
/*static*/ void
|
|
SharedMemory::Destroyed()
|
|
{
|
|
NS_ABORT_IF_FALSE(gShmemAllocated >= mAllocSize,
|
|
"Can't destroy more than allocated");
|
|
gShmemAllocated -= mAllocSize;
|
|
mAllocSize = 0;
|
|
}
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|