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d7c4757af3
moz_posix_memalign is a wrapper for posix_memalign that only exists if posix_memalign exists. On OSX, it has a fallback for an under-specified bug where it purportedly returns a pointer that doesn't have the requested alignment. That fallback was added in bug 414946, over 6 years ago, before jemalloc was even enabled on OSX. Considering posix_memalign is used directly in many other places in Gecko, that we almost always use mozjemalloc, which doesn't have these problems, and that in all likeliness, the bug was in some old version of OSX that is not supported anymore, the fallback does not seem all that useful. So, just use posix_memalign directly. --HG-- extra : rebase_source : b2151b5fb598dc20cbd70308555059f7545b18b2
88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
/* 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 "VolatileBuffer.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/mozalloc.h"
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#ifdef MOZ_MEMORY
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int posix_memalign(void** memptr, size_t alignment, size_t size);
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#endif
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namespace mozilla {
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VolatileBuffer::VolatileBuffer()
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: mMutex("VolatileBuffer")
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, mBuf(nullptr)
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, mSize(0)
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, mLockCount(0)
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{
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}
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bool VolatileBuffer::Init(size_t aSize, size_t aAlignment)
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{
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MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
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MOZ_ASSERT(!(aAlignment % sizeof(void *)),
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"Alignment must be multiple of pointer size");
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mSize = aSize;
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#if defined(MOZ_MEMORY) || defined(HAVE_POSIX_MEMALIGN)
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if (posix_memalign(&mBuf, aAlignment, aSize) != 0) {
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return false;
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}
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#else
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#error "No memalign implementation found"
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#endif
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return !!mBuf;
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}
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VolatileBuffer::~VolatileBuffer()
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{
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MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
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free(mBuf);
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}
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bool
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VolatileBuffer::Lock(void** aBuf)
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{
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MutexAutoLock lock(mMutex);
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MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
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*aBuf = mBuf;
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mLockCount++;
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return true;
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}
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void
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VolatileBuffer::Unlock()
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{
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MutexAutoLock lock(mMutex);
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mLockCount--;
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MOZ_ASSERT(mLockCount >= 0, "VolatileBuffer unlocked too many times!");
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}
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bool
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VolatileBuffer::OnHeap() const
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{
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return true;
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}
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size_t
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VolatileBuffer::HeapSizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
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{
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return aMallocSizeOf(mBuf);
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}
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size_t
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VolatileBuffer::NonHeapSizeOfExcludingThis() const
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{
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return 0;
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}
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} // namespace mozilla
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