/* 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 "VolatileBuffer.h"
#include "mozilla/Assertions.h"
#include "mozilla/mozalloc.h"
#ifdef MOZ_MEMORY
int posix_memalign(
void** memptr, size_t alignment, size_t size);
#endif
namespace mozilla {
VolatileBuffer::VolatileBuffer()
: mMutex(
"VolatileBuffer"), mBuf(nullptr), mSize(0), mLockCount(0) {}
bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) {
MOZ_ASSERT(!mSize && !mBuf,
"Init called twice");
MOZ_ASSERT(!(aAlignment %
sizeof(
void*)),
"Alignment must be multiple of pointer size");
mSize = aSize;
#if defined(MOZ_MEMORY) ||
defined(HAVE_POSIX_MEMALIGN)
if (posix_memalign(&mBuf, aAlignment, aSize) != 0) {
return false;
}
#else
# error
"No memalign implementation found"
#endif
return !!mBuf;
}
VolatileBuffer::~VolatileBuffer() {
MOZ_ASSERT(mLockCount == 0,
"Being destroyed with non-zero lock count?");
free(mBuf);
}
bool VolatileBuffer::Lock(
void** aBuf) {
MutexAutoLock lock(mMutex);
MOZ_ASSERT(mBuf,
"Attempting to lock an uninitialized VolatileBuffer");
*aBuf = mBuf;
mLockCount++;
return true;
}
void VolatileBuffer::Unlock() {
MutexAutoLock lock(mMutex);
mLockCount--;
MOZ_ASSERT(mLockCount >= 0,
"VolatileBuffer unlocked too many times!");
}
bool VolatileBuffer::OnHeap()
const {
return true; }
size_t VolatileBuffer::HeapSizeOfExcludingThis(
MallocSizeOf aMallocSizeOf)
const {
return aMallocSizeOf(mBuf);
}
size_t VolatileBuffer::NonHeapSizeOfExcludingThis()
const {
return 0; }
}
// namespace mozilla
