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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 "content/renderer/render_process_visibility_manager.h"
#include "base/logging.h"
#include "base/memory/memory_pressure_listener.h"
namespace content {
RenderProcessVisibilityManager::RenderProcessVisibilityManager()
: num_visible_render_widgets_(0) {
}
RenderProcessVisibilityManager::~RenderProcessVisibilityManager() {
}
// static
RenderProcessVisibilityManager* RenderProcessVisibilityManager::GetInstance() {
return Singleton<RenderProcessVisibilityManager>::get();
}
void RenderProcessVisibilityManager::WidgetVisibilityChanged(bool visible) {
#if !defined(DISCARDABLE_MEMORY_ALWAYS_SUPPORTED_NATIVELY)
num_visible_render_widgets_ += visible ? 1 : -1;
DCHECK_LE(0, num_visible_render_widgets_);
if (num_visible_render_widgets_ == 0) {
// TODO(vollick): Remove this this heavy-handed approach once we're polling
// the real system memory pressure.
base::MemoryPressureListener::NotifyMemoryPressure(
base::MemoryPressureListener::MEMORY_PRESSURE_CRITICAL);
}
#endif
}
} // namespace content
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