event.hpp

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/*
Copyright (c) 2014-2016, Scott Zuyderduyn
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*/

//----------------------------------------------------------------------------
// event.hpp
//
// Encapsulates a CUDA API event.
//
// Author: Scott D. Zuyderduyn, Ph.D. (scott.zuyderduyn@utoronto.ca)
//----------------------------------------------------------------------------

#pragma once
#ifndef ECUDA_EVENT_HPP
#define ECUDA_EVENT_HPP

#include "global.hpp"
#include "impl/host_emulation.hpp" // gets data structure definitions when compiling host-only without nvcc

namespace ecuda {

class event {

private:
    cudaEvent_t _event;

public:
    event() { cudaEventCreate(&_event); }

    event( unsigned flags ) { cudaEventCreateWithFlags(&_event,flags); }

    ~event() { cudaEventDestroy(_event); }

    inline void record( cudaStream_t stream = 0 ) { cudaEventRecord( _event, stream ); }

    inline cudaError_t synchronize() { return cudaEventSynchronize( _event ); }

    inline cudaError_t query() { return cudaEventQuery( _event ); }

    static float elapsed_time( event& start, event& end ) {
        float t;
        cudaEventElapsedTime( &t, start._event, end._event );
        return t;
    }

    inline float operator-( event& other ) { return event::elapsed_time( other, *this ); }

};


} // namespace ecuda

#endif