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#pragma once
#include <util/generic/ptr.h>
#include <util/datetime/base.h>
struct TEventResetType {
enum ResetMode {
rAuto, // the state will be nonsignaled after Wait() returns
rManual, // we need call Reset() to set the state to nonsignaled.
};
};
/**
* DEPRECATED!
*
* Use TAutoEvent, TManualEvent for the direct replacement.
* Use TManualEvent to prevent SEGFAULT (http://nga.at.yandex-team.ru/5772).
*/
class TSystemEvent: public TEventResetType {
public:
TSystemEvent(ResetMode rmode = rManual);
TSystemEvent(const TSystemEvent& other) noexcept;
TSystemEvent& operator=(const TSystemEvent& other) noexcept;
~TSystemEvent();
void Reset() noexcept;
void Signal() noexcept;
/*
* return true if signaled, false if timed out.
*/
bool WaitD(TInstant deadLine) noexcept;
/*
* return true if signaled, false if timed out.
*/
inline bool WaitT(TDuration timeOut) noexcept {
return WaitD(timeOut.ToDeadLine());
}
/*
* wait infinite time
*/
inline void WaitI() noexcept {
WaitD(TInstant::Max());
}
// return true if signaled, false if timed out.
inline bool Wait(ui32 timer) noexcept {
return WaitT(TDuration::MilliSeconds(timer));
}
inline bool Wait() noexcept {
WaitI();
return true;
}
private:
class TEvImpl;
TIntrusivePtr<TEvImpl> EvImpl_;
};
class TAutoEvent: public TSystemEvent {
public:
TAutoEvent()
: TSystemEvent(TSystemEvent::rAuto)
{
}
private:
void Reset() noexcept;
};
/**
* Prevents from a "shortcut problem" (see http://nga.at.yandex-team.ru/5772): if Wait will be called after Signaled
* flag set to true in Signal method but before CondVar.BroadCast - Wait will shortcut (without actual wait on condvar).
* If Wait thread will destruct event - Signal thread will do broadcast on a destructed CondVar.
*/
class TManualEvent {
public:
TManualEvent()
: Ev(TEventResetType::rManual)
{
}
void Reset() noexcept {
TSystemEvent{Ev}.Reset();
}
void Signal() noexcept {
TSystemEvent{Ev}.Signal();
}
/** return true if signaled, false if timed out. */
bool WaitD(TInstant deadLine) noexcept {
return TSystemEvent{Ev}.WaitD(deadLine);
}
/** return true if signaled, false if timed out. */
inline bool WaitT(TDuration timeOut) noexcept {
return TSystemEvent{Ev}.WaitT(timeOut);
}
/** Wait infinite time */
inline void WaitI() noexcept {
TSystemEvent{Ev}.WaitI();
}
/** return true if signaled, false if timed out. */
inline bool Wait(ui32 timer) noexcept {
return TSystemEvent{Ev}.Wait(timer);
}
inline bool Wait() noexcept {
return TSystemEvent{Ev}.Wait();
}
private:
TSystemEvent Ev;
};
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