base/memory/discardable_memory_malloc.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/memory/discardable_memory_malloc.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace base {
  10 namespace internal {
  11
  12 DiscardableMemoryMalloc::DiscardableMemoryMalloc(size_t size) : size_(size) {
  13 }
  14
  15 DiscardableMemoryMalloc::~DiscardableMemoryMalloc() {
  16 }
  17
  18 bool DiscardableMemoryMalloc::Initialize() {
  19   return Lock() != DISCARDABLE_MEMORY_LOCK_STATUS_FAILED;
  20 }
  21
  22 DiscardableMemoryLockStatus DiscardableMemoryMalloc::Lock() {
  23   DCHECK(!memory_);
  24
  25   memory_.reset(static_cast<uint8*>(malloc(size_)));
  26   if (!memory_)
  27     return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED;
  28
  29   return DISCARDABLE_MEMORY_LOCK_STATUS_PURGED;
  30 }
  31
  32 void DiscardableMemoryMalloc::Unlock() {
  33   DCHECK(memory_);
  34   memory_.reset();
  35 }
  36
  37 void* DiscardableMemoryMalloc::Memory() const {
  38   DCHECK(memory_);
  39   return memory_.get();
  40 }
  41
  42 }  // namespace internal
  43 }  // namespace base