Index: base/memory/memory_pressure_listener.cc |
diff --git a/base/memory/memory_pressure_listener.cc b/base/memory/memory_pressure_listener.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b0b4161751fc92de56e4e44ed0d53d2b6c85e6e3 |
--- /dev/null |
+++ b/base/memory/memory_pressure_listener.cc |
@@ -0,0 +1,40 @@ |
+// Copyright (c) 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/memory_pressure_listener.h" |
+ |
+#include "base/lazy_instance.h" |
+#include "base/observer_list_threadsafe.h" |
+ |
+namespace { |
+ |
+base::LazyInstance<ObserverListThreadSafe<base::MemoryPressureListener> >::Leaky |
+ g_observers = LAZY_INSTANCE_INITIALIZER; |
+ |
+} // namespace |
+ |
+namespace base { |
+ |
+MemoryPressureListener::MemoryPressureListener( |
+ const MemoryPressureListener::MemoryPressureCallback& callback) |
+ : callback_(callback) { |
+ g_observers.Get().AddObserver(this); |
+} |
+ |
+MemoryPressureListener::~MemoryPressureListener() { |
+ g_observers.Get().RemoveObserver(this); |
+} |
+ |
+void MemoryPressureListener::Notify(MemoryPressureLevel memory_pressure_level) { |
+ callback_.Run(memory_pressure_level); |
+} |
+ |
+// static |
+void MemoryPressureListener::NotifyMemoryPressure( |
+ MemoryPressureLevel memory_pressure_level) { |
+ g_observers.Get().Notify(&MemoryPressureListener::Notify, |
+ memory_pressure_level); |
+} |
+ |
+} // namespace base |