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/* 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