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// 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_manager.h"
namespace base {
namespace {
base::LazyInstance<internal::DiscardableMemoryManager>::Leaky g_manager =
LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace internal {
DiscardableMemoryEmulated::DiscardableMemoryEmulated(size_t size)
: is_locked_(false) {
g_manager.Pointer()->Register(this, size);
}
DiscardableMemoryEmulated::~DiscardableMemoryEmulated() {
if (is_locked_)
Unlock();
g_manager.Pointer()->Unregister(this);
}
// static
void DiscardableMemoryEmulated::RegisterMemoryPressureListeners() {
g_manager.Pointer()->RegisterMemoryPressureListener();
}
// static
void DiscardableMemoryEmulated::UnregisterMemoryPressureListeners() {
g_manager.Pointer()->UnregisterMemoryPressureListener();
}
// static
void DiscardableMemoryEmulated::PurgeForTesting() {
g_manager.Pointer()->PurgeAll();
}
bool DiscardableMemoryEmulated::Initialize() {
return Lock() == DISCARDABLE_MEMORY_LOCK_STATUS_PURGED;
}
DiscardableMemoryLockStatus DiscardableMemoryEmulated::Lock() {
DCHECK(!is_locked_);
bool purged = false;
memory_ = g_manager.Pointer()->Acquire(this, &purged);
if (!memory_)
return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED;
is_locked_ = true;
return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED
: DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS;
}
void DiscardableMemoryEmulated::Unlock() {
DCHECK(is_locked_);
g_manager.Pointer()->Release(this, memory_.Pass());
is_locked_ = false;
}
void* DiscardableMemoryEmulated::Memory() const {
DCHECK(memory_);
return memory_.get();
}
} // namespace internal
} // namespace base
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