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// Copyright 2015 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.
#ifndef BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
#include <dispatch/dispatch.h>
#include "base/base_export.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/memory_pressure_monitor.h"
// The following was added to <dispatch/source.h> after 10.8.
// TODO(shrike): Remove the DISPATCH_MEMORYPRESSURE_NORMAL ifndef once builders
// reach 10.9 or higher.
#ifndef DISPATCH_MEMORYPRESSURE_NORMAL
#define DISPATCH_MEMORYPRESSURE_NORMAL 0x01
#define DISPATCH_MEMORYPRESSURE_WARN 0x02
#define DISPATCH_MEMORYPRESSURE_CRITICAL 0x04
#endif // DISPATCH_MEMORYPRESSURE_NORMAL
namespace base {
namespace mac {
class TestMemoryPressureMonitor;
struct DispatchSourceSDeleter {
void operator()(dispatch_source_s* ptr) {
dispatch_source_cancel(ptr);
dispatch_release(ptr);
}
};
// Declares the interface for the Mac MemoryPressureMonitor, which reports
// memory pressure events and status.
class BASE_EXPORT MemoryPressureMonitor : public base::MemoryPressureMonitor {
public:
MemoryPressureMonitor();
~MemoryPressureMonitor() override;
// Returns the currently-observed memory pressure.
MemoryPressureLevel GetCurrentPressureLevel() const override;
private:
friend TestMemoryPressureMonitor;
static MemoryPressureLevel
MemoryPressureLevelForMacMemoryPressure(int mac_memory_pressure);
static void NotifyMemoryPressureChanged(dispatch_source_s* event_source);
scoped_ptr<dispatch_source_s, DispatchSourceSDeleter>
memory_level_event_source_;
DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
};
} // namespace mac
} // namespace base
#endif // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
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