memory/volatile/VolatileBufferFallback.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 26 Mar 2015 12:07:17 +0900
changeset 258314 fc1e894eec2fbd34b745cd94f505080427d24705
parent 251460 26cdb770b82117ae67655c7c4e07abad4d15ccf6
child 446767 d9adbaf945bba0d7b5286e94f1ce2354aaff587c
permissions -rw-r--r--
Bug 1147207 - Add a ComposedFinder class that acts like a FileFinder proxy over multiple FileFinders. r=gps, a=sledru

/* 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)
  if (posix_memalign(&mBuf, aAlignment, aSize) != 0) {
    return false;
  }
#elif defined(HAVE_POSIX_MEMALIGN)
  if (moz_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