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comparison: ipc/glue/SharedMemory.cpp
ipc/glue/SharedMemory.cpp
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include <math.h> | |
| 8 | |
| 9 #include "nsString.h" | |
| 10 #include "nsIMemoryReporter.h" | |
| 11 #include "mozilla/ipc/SharedMemory.h" | |
| 12 #include "mozilla/Atomics.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 namespace ipc { | |
| 16 | |
| 17 static Atomic<size_t> gShmemAllocated; | |
| 18 static Atomic<size_t> gShmemMapped; | |
| 19 | |
| 20 class ShmemReporter MOZ_FINAL : public nsIMemoryReporter | |
| 21 { | |
| 22 public: | |
| 23 NS_DECL_THREADSAFE_ISUPPORTS | |
| 24 | |
| 25 NS_IMETHOD | |
| 26 CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData) | |
| 27 { | |
| 28 nsresult rv; | |
| 29 rv = MOZ_COLLECT_REPORT( | |
| 30 "shmem-allocated", KIND_OTHER, UNITS_BYTES, gShmemAllocated, | |
| 31 "Memory shared with other processes that is accessible (but not " | |
| 32 "necessarily mapped)."); | |
| 33 NS_ENSURE_SUCCESS(rv, rv); | |
| 34 | |
| 35 rv = MOZ_COLLECT_REPORT( | |
| 36 "shmem-mapped", KIND_OTHER, UNITS_BYTES, gShmemMapped, | |
| 37 "Memory shared with other processes that is mapped into the address " | |
| 38 "space."); | |
| 39 NS_ENSURE_SUCCESS(rv, rv); | |
| 40 | |
| 41 return NS_OK; | |
| 42 } | |
| 43 }; | |
| 44 | |
| 45 NS_IMPL_ISUPPORTS(ShmemReporter, nsIMemoryReporter) | |
| 46 | |
| 47 SharedMemory::SharedMemory() | |
| 48 : mAllocSize(0) | |
| 49 , mMappedSize(0) | |
| 50 { | |
| 51 MOZ_COUNT_CTOR(SharedMemory); | |
| 52 static Atomic<bool> registered; | |
| 53 if (registered.compareExchange(false, true)) { | |
| 54 RegisterStrongMemoryReporter(new ShmemReporter()); | |
| 55 } | |
| 56 } | |
| 57 | |
| 58 /*static*/ size_t | |
| 59 SharedMemory::PageAlignedSize(size_t aSize) | |
| 60 { | |
| 61 size_t pageSize = SystemPageSize(); | |
| 62 size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize))); | |
| 63 return pageSize * nPagesNeeded; | |
| 64 } | |
| 65 | |
| 66 void | |
| 67 SharedMemory::Created(size_t aNBytes) | |
| 68 { | |
| 69 mAllocSize = aNBytes; | |
| 70 gShmemAllocated += mAllocSize; | |
| 71 } | |
| 72 | |
| 73 void | |
| 74 SharedMemory::Mapped(size_t aNBytes) | |
| 75 { | |
| 76 mMappedSize = aNBytes; | |
| 77 gShmemMapped += mMappedSize; | |
| 78 } | |
| 79 | |
| 80 void | |
| 81 SharedMemory::Unmapped() | |
| 82 { | |
| 83 NS_ABORT_IF_FALSE(gShmemMapped >= mMappedSize, | |
| 84 "Can't unmap more than mapped"); | |
| 85 gShmemMapped -= mMappedSize; | |
| 86 mMappedSize = 0; | |
| 87 } | |
| 88 | |
| 89 /*static*/ void | |
| 90 SharedMemory::Destroyed() | |
| 91 { | |
| 92 NS_ABORT_IF_FALSE(gShmemAllocated >= mAllocSize, | |
| 93 "Can't destroy more than allocated"); | |
| 94 gShmemAllocated -= mAllocSize; | |
| 95 mAllocSize = 0; | |
| 96 } | |
| 97 | |
| 98 } // namespace ipc | |
| 99 } // namespace mozilla |
