1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/memory/mozalloc/VolatileBufferFallback.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,81 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "VolatileBuffer.h"
1.9 +#include "mozilla/Assertions.h"
1.10 +#include "mozilla/NullPtr.h"
1.11 +#include "mozilla/mozalloc.h"
1.12 +
1.13 +#ifdef MOZ_MEMORY
1.14 +int posix_memalign(void** memptr, size_t alignment, size_t size);
1.15 +#endif
1.16 +
1.17 +namespace mozilla {
1.18 +
1.19 +VolatileBuffer::VolatileBuffer()
1.20 + : mBuf(nullptr)
1.21 + , mSize(0)
1.22 + , mLockCount(0)
1.23 +{
1.24 +}
1.25 +
1.26 +bool VolatileBuffer::Init(size_t aSize, size_t aAlignment)
1.27 +{
1.28 + MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
1.29 + MOZ_ASSERT(!(aAlignment % sizeof(void *)),
1.30 + "Alignment must be multiple of pointer size");
1.31 +
1.32 + mSize = aSize;
1.33 +#if defined(MOZ_MEMORY)
1.34 + posix_memalign(&mBuf, aAlignment, aSize);
1.35 +#elif defined(HAVE_POSIX_MEMALIGN)
1.36 + (void)moz_posix_memalign(&mBuf, aAlignment, aSize);
1.37 +#else
1.38 +#error "No memalign implementation found"
1.39 +#endif
1.40 + return !!mBuf;
1.41 +}
1.42 +
1.43 +VolatileBuffer::~VolatileBuffer()
1.44 +{
1.45 + free(mBuf);
1.46 +}
1.47 +
1.48 +bool
1.49 +VolatileBuffer::Lock(void** aBuf)
1.50 +{
1.51 + MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
1.52 +
1.53 + *aBuf = mBuf;
1.54 + mLockCount++;
1.55 +
1.56 + return true;
1.57 +}
1.58 +
1.59 +void
1.60 +VolatileBuffer::Unlock()
1.61 +{
1.62 + mLockCount--;
1.63 + MOZ_ASSERT(mLockCount >= 0, "VolatileBuffer unlocked too many times!");
1.64 +}
1.65 +
1.66 +bool
1.67 +VolatileBuffer::OnHeap() const
1.68 +{
1.69 + return true;
1.70 +}
1.71 +
1.72 +size_t
1.73 +VolatileBuffer::HeapSizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
1.74 +{
1.75 + return aMallocSizeOf(mBuf);
1.76 +}
1.77 +
1.78 +size_t
1.79 +VolatileBuffer::NonHeapSizeOfExcludingThis() const
1.80 +{
1.81 + return 0;
1.82 +}
1.83 +
1.84 +} // namespace mozilla
