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// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
//Boost chrono has awesome high res timer!
//But its only in very recent boosts,
//so we have this little wrapper...
//now/tps inspired by libnumanuma.
#ifndef INCLUDED_GRAS_CHRONO_HPP
#define INCLUDED_GRAS_CHRONO_HPP
#include <gras/gras.hpp>
namespace gras
{
typedef long long time_ticks_t;
//! Get the time now in tick counts
time_ticks_t time_now(void);
//! Get the number of ticks per second
time_ticks_t time_tps(void);
/*!
* Timer Accumulate creates a scoped timer object,
* which adds the time elapsed into the accumulator.
* Typically, the time elapsed is the absolute
* destructor time - absolute constructor time.
* However, the user may call done() to accumulate
* the time elapsed before the destructor is called.
*/
struct TimerAccumulate
{
//! Create a new timer object given the accumulator
TimerAccumulate(time_ticks_t &accum);
//! Destructor accumulates the elapsed time
~TimerAccumulate(void);
//! Accumulate elapsed time before destructor
void done(void);
time_ticks_t &accum;
time_ticks_t start;
bool is_done;
};
}
//--------------------------------------------------------------------//
//------------------ implementation details below --------------------//
//--------------------------------------------------------------------//
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#include <windows.h>
namespace gras
{
GRAS_FORCE_INLINE time_ticks_t time_now(void)
{
LARGE_INTEGER counts;
QueryPerformanceCounter(&counts);
return counts.QuadPart;
}
GRAS_FORCE_INLINE time_ticks_t time_tps(void)
{
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
return freq.QuadPart;
}
} //namespace gras
#else
#include <ctime>
namespace gras
{
GRAS_FORCE_INLINE time_ticks_t time_now(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec*1000000000UL + ts.tv_nsec;
}
GRAS_FORCE_INLINE time_ticks_t time_tps(void)
{
return 1000000000UL;
}
} //namespace gras
#endif
namespace gras
{
GRAS_FORCE_INLINE TimerAccumulate::TimerAccumulate(time_ticks_t &accum):
accum(accum),
start(time_now()),
is_done(false)
{
//NOP
}
GRAS_FORCE_INLINE TimerAccumulate::~TimerAccumulate(void)
{
if (not is_done) this->done();
}
GRAS_FORCE_INLINE void TimerAccumulate::done(void)
{
accum += (time_now() - start);
is_done = true;
}
}
#endif /*INCLUDED_GRAS_CHRONO_HPP*/
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