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comparison: memory/mozalloc/VolatileBufferFallback.cpp
memory/mozalloc/VolatileBufferFallback.cpp
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| -1:000000000000 | 0:c9f72ec302ef |
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "VolatileBuffer.h" | |
| 6 #include "mozilla/Assertions.h" | |
| 7 #include "mozilla/NullPtr.h" | |
| 8 #include "mozilla/mozalloc.h" | |
| 9 | |
| 10 #ifdef MOZ_MEMORY | |
| 11 int posix_memalign(void** memptr, size_t alignment, size_t size); | |
| 12 #endif | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 VolatileBuffer::VolatileBuffer() | |
| 17 : mBuf(nullptr) | |
| 18 , mSize(0) | |
| 19 , mLockCount(0) | |
| 20 { | |
| 21 } | |
| 22 | |
| 23 bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) | |
| 24 { | |
| 25 MOZ_ASSERT(!mSize && !mBuf, "Init called twice"); | |
| 26 MOZ_ASSERT(!(aAlignment % sizeof(void *)), | |
| 27 "Alignment must be multiple of pointer size"); | |
| 28 | |
| 29 mSize = aSize; | |
| 30 #if defined(MOZ_MEMORY) | |
| 31 posix_memalign(&mBuf, aAlignment, aSize); | |
| 32 #elif defined(HAVE_POSIX_MEMALIGN) | |
| 33 (void)moz_posix_memalign(&mBuf, aAlignment, aSize); | |
| 34 #else | |
| 35 #error "No memalign implementation found" | |
| 36 #endif | |
| 37 return !!mBuf; | |
| 38 } | |
| 39 | |
| 40 VolatileBuffer::~VolatileBuffer() | |
| 41 { | |
| 42 free(mBuf); | |
| 43 } | |
| 44 | |
| 45 bool | |
| 46 VolatileBuffer::Lock(void** aBuf) | |
| 47 { | |
| 48 MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer"); | |
| 49 | |
| 50 *aBuf = mBuf; | |
| 51 mLockCount++; | |
| 52 | |
| 53 return true; | |
| 54 } | |
| 55 | |
| 56 void | |
| 57 VolatileBuffer::Unlock() | |
| 58 { | |
| 59 mLockCount--; | |
| 60 MOZ_ASSERT(mLockCount >= 0, "VolatileBuffer unlocked too many times!"); | |
| 61 } | |
| 62 | |
| 63 bool | |
| 64 VolatileBuffer::OnHeap() const | |
| 65 { | |
| 66 return true; | |
| 67 } | |
| 68 | |
| 69 size_t | |
| 70 VolatileBuffer::HeapSizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const | |
| 71 { | |
| 72 return aMallocSizeOf(mBuf); | |
| 73 } | |
| 74 | |
| 75 size_t | |
| 76 VolatileBuffer::NonHeapSizeOfExcludingThis() const | |
| 77 { | |
| 78 return 0; | |
| 79 } | |
| 80 | |
| 81 } // namespace mozilla |
