webkit/child/web_discardable_memory_impl.cc

   1 // Copyright 2013 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 "webkit/child/web_discardable_memory_impl.h"
   6
   7 namespace webkit_glue {
   8
   9 WebDiscardableMemoryImpl::~WebDiscardableMemoryImpl() {}
  10
  11 // static
  12 scoped_ptr<WebDiscardableMemoryImpl>
  13 WebDiscardableMemoryImpl::CreateLockedMemory(size_t size) {
  14   scoped_ptr<base::DiscardableMemory> memory(
  15       base::DiscardableMemory::CreateLockedMemory(size));
  16   if (!memory)
  17     return scoped_ptr<WebDiscardableMemoryImpl>();
  18   return make_scoped_ptr(new WebDiscardableMemoryImpl(memory.Pass()));
  19 }
  20
  21 bool WebDiscardableMemoryImpl::lock() {
  22   base::LockDiscardableMemoryStatus status = discardable_->Lock();
  23   switch (status) {
  24     case base::DISCARDABLE_MEMORY_SUCCESS:
  25       return true;
  26     case base::DISCARDABLE_MEMORY_PURGED:
  27       discardable_->Unlock();
  28       return false;
  29     default:
  30       discardable_.reset();
  31       return false;
  32   }
  33 }
  34
  35 void WebDiscardableMemoryImpl::unlock() {
  36   discardable_->Unlock();
  37 }
  38
  39 void* WebDiscardableMemoryImpl::data() {
  40   return discardable_->Memory();
  41 }
  42
  43 WebDiscardableMemoryImpl::WebDiscardableMemoryImpl(
  44     scoped_ptr<base::DiscardableMemory> memory)
  45     : discardable_(memory.Pass()) {
  46 }
  47
  48 }  // namespace webkit_glue