ProcessThrottler.h [plain text]
#ifndef ProcessThrottler_h
#define ProcessThrottler_h
#include "ProcessAssertion.h"
#include <wtf/RefCounter.h>
#include <wtf/RunLoop.h>
#include <wtf/WeakPtr.h>
namespace WebKit {
enum UserObservablePageCounterType { };
typedef RefCounter<UserObservablePageCounterType> UserObservablePageCounter;
enum ProcessSuppressionDisabledCounterType { };
typedef RefCounter<ProcessSuppressionDisabledCounterType> ProcessSuppressionDisabledCounter;
typedef ProcessSuppressionDisabledCounter::Token ProcessSuppressionDisabledToken;
class ProcessThrottlerClient;
class ProcessThrottler : private ProcessAssertionClient {
public:
enum ForegroundActivityCounterType { };
typedef RefCounter<ForegroundActivityCounterType> ForegroundActivityCounter;
typedef ForegroundActivityCounter::Token ForegroundActivityToken;
enum BackgroundActivityCounterType { };
typedef RefCounter<BackgroundActivityCounterType> BackgroundActivityCounter;
typedef BackgroundActivityCounter::Token BackgroundActivityToken;
ProcessThrottler(ProcessThrottlerClient&, bool shouldTakeUIBackgroundAssertion);
inline ForegroundActivityToken foregroundActivityToken() const;
inline BackgroundActivityToken backgroundActivityToken() const;
void didConnectToProcess(pid_t);
void processReadyToSuspend();
void didCancelProcessSuspension();
private:
AssertionState assertionState();
void updateAssertion();
void updateAssertionNow();
void suspendTimerFired();
void assertionWillExpireImminently() override;
ProcessThrottlerClient& m_process;
std::unique_ptr<ProcessAssertion> m_assertion;
RunLoop::Timer<ProcessThrottler> m_suspendTimer;
ForegroundActivityCounter m_foregroundCounter;
BackgroundActivityCounter m_backgroundCounter;
int m_suspendMessageCount { 0 };
bool m_shouldTakeUIBackgroundAssertion;
};
inline ProcessThrottler::ForegroundActivityToken ProcessThrottler::foregroundActivityToken() const
{
return ForegroundActivityToken(m_foregroundCounter.count());
}
inline ProcessThrottler::BackgroundActivityToken ProcessThrottler::backgroundActivityToken() const
{
return BackgroundActivityToken(m_backgroundCounter.count());
}
}
#endif // ProcessThrottler_h