blob: 6f0e02f19c96c5a4bea967c794a14aca94741de7 [file] [log] [blame]
// 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.
#include <CoreFoundation/CFDate.h>
#include <dispatch/dispatch.h>
#include "base/base_export.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_dispatch_object.h"
#include "base/macros.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/memory_pressure_monitor.h"
#include "base/message_loop/message_pump_mac.h"
#include "starboard/types.h"
namespace base {
namespace mac {
class TestMemoryPressureMonitor;
// Declares the interface for the Mac MemoryPressureMonitor, which reports
// memory pressure events and status.
class BASE_EXPORT MemoryPressureMonitor : public base::MemoryPressureMonitor {
~MemoryPressureMonitor() override;
// Returns the currently-observed memory pressure.
MemoryPressureLevel GetCurrentPressureLevel() override;
void SetDispatchCallback(const DispatchCallback& callback) override;
friend TestMemoryPressureMonitor;
static MemoryPressureLevel MemoryPressureLevelForMacMemoryPressureLevel(
int mac_memory_pressure_level);
static void OnRunLoopExit(CFRunLoopObserverRef observer,
CFRunLoopActivity activity,
void* info);
// Returns the raw memory pressure level from the macOS. Exposed for
// unit testing.
virtual int GetMacMemoryPressureLevel();
// Updates |last_pressure_level_| with the current memory pressure level.
void UpdatePressureLevel();
// Updates |last_pressure_level_| at the end of every run loop pass (modulo
// some number of seconds).
void UpdatePressureLevelOnRunLoopExit();
// Run |dispatch_callback| on memory pressure notifications from the OS.
void OnMemoryPressureChanged(dispatch_source_s* event_source,
const DispatchCallback& dispatch_callback);
// Returns the number of seconds per UMA tick (for statistics recording).
// Exposed for testing.
static int GetSecondsPerUMATick();
// The dispatch source that generates memory pressure change notifications.
ScopedDispatchObject<dispatch_source_t> memory_level_event_source_;
// The callback to call upon receiving a memory pressure change notification.
DispatchCallback dispatch_callback_;
// Last UMA report time.
CFTimeInterval last_statistic_report_time_;
// Most-recent memory pressure level.
MemoryPressureLevel last_pressure_level_;
// Observer that tracks exits from the main run loop.
ScopedCFTypeRef<CFRunLoopObserverRef> exit_observer_;
// Next time to update the memory pressure level when exiting the run loop.
CFTimeInterval next_run_loop_update_time_;
// Seconds left over from the last UMA tick calculation (to be added to the
// next calculation).
CFTimeInterval subtick_seconds_;
} // namespace mac
} // namespace base