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This represents UE4/Main @ 16130047 and Dev-PerfTest @ 16126156 [CL 16163576 by aurel cordonnier in ue5-main branch]
108 lines
2.1 KiB
C++
108 lines
2.1 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "HAL/Event.h"
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#include "HAL/PlatformProcess.h"
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namespace AVEncoder
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{
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namespace DecoderUtilities
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{
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class FEventSignal
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{
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public:
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FEventSignal(): Event(FPlatformProcess::GetSynchEventFromPool(true))
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{ }
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// Not copyable!
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FEventSignal(const FEventSignal&) = delete;
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FEventSignal& operator=(const FEventSignal&) = delete;
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~FEventSignal()
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{
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Event->Trigger();
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FPlatformProcess::ReturnSynchEventToPool(Event);
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}
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/**
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* Waits for the event signal to get set. If already set, this function returns immediately.
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*/
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void Wait()
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{
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Event->Wait();
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}
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/**
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* Waits for the event signal to get set and clears it immediately. If already set, this function returns immediately.
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*/
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void WaitAndReset()
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{
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Event->Wait();
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Event->Reset();
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}
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/**
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* Signals the event to be set. If already set, this does nothing.
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*/
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void Signal()
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{
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Event->Trigger();
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}
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/**
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* Clears the signal. Threads will now wait again until the signal is set once more.
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*/
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void Reset()
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{
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Event->Reset();
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}
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/**
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* Returns state of the signal.
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*/
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bool IsSignaled() const
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{
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return Event->Wait(0);
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}
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/**
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* Waits for the event signal to get set within the given time limit.
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* If already set, this function returns immediately.
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* Returns true when event was set, false when wait timed out.
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*/
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bool WaitTimeout(int64 InMicroSeconds)
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{
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return Event->Wait(FTimespan::FromMicroseconds(InMicroSeconds));
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}
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/**
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* Waits for the event signal to get set within the given time limit and clears it immediately.
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* If already set, this function returns immediately.
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* Returns true when event was set, false when wait timed out.
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*/
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bool WaitTimeoutAndReset(int64 InMicroSeconds)
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{
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check(InMicroSeconds > 0); // 0 is forbidden. either call Wait() without timeout, or check the signal using IsSignaled()
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if (Event->Wait(FTimespan::FromMicroseconds(InMicroSeconds)))
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{
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Event->Reset();
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return true;
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}
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return false;
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}
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private:
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mutable FEvent* Event;
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};
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} /* namespace DecoderUtilities */
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} /* namespace AVEncoder */
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