| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/memory/discardable_memory_emulated.h" |
| |
| #include "base/lazy_instance.h" |
| #include "base/memory/discardable_memory_provider.h" |
| |
| namespace base { |
| |
| namespace { |
| |
| base::LazyInstance<internal::DiscardableMemoryProvider>::Leaky g_provider = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| namespace internal { |
| |
| DiscardableMemoryEmulated::DiscardableMemoryEmulated(size_t size) |
| : is_locked_(false) { |
| g_provider.Pointer()->Register(this, size); |
| } |
| |
| DiscardableMemoryEmulated::~DiscardableMemoryEmulated() { |
| if (is_locked_) |
| Unlock(); |
| g_provider.Pointer()->Unregister(this); |
| } |
| |
| bool DiscardableMemoryEmulated::Initialize() { |
| return Lock() == DISCARDABLE_MEMORY_PURGED; |
| } |
| |
| LockDiscardableMemoryStatus DiscardableMemoryEmulated::Lock() { |
| DCHECK(!is_locked_); |
| |
| bool purged = false; |
| memory_ = g_provider.Pointer()->Acquire(this, &purged); |
| if (!memory_) |
| return DISCARDABLE_MEMORY_FAILED; |
| |
| is_locked_ = true; |
| return purged ? DISCARDABLE_MEMORY_PURGED : DISCARDABLE_MEMORY_SUCCESS; |
| } |
| |
| void DiscardableMemoryEmulated::Unlock() { |
| DCHECK(is_locked_); |
| g_provider.Pointer()->Release(this, memory_.Pass()); |
| is_locked_ = false; |
| } |
| |
| void* DiscardableMemoryEmulated::Memory() const { |
| DCHECK(memory_); |
| return memory_.get(); |
| } |
| |
| // static |
| void DiscardableMemoryEmulated::PurgeForTesting() { |
| g_provider.Pointer()->PurgeAll(); |
| } |
| |
| } // namespace internal |
| } // namespace base |