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/* melder_time.cpp
*
* Copyright (C) 1992-2011 Paul Boersma
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* pb 2008/01/30 moved from Melder_audio.c
* pb 2008/01/31 Win: use QueryPerformanceCounter
* pb 2008/03/18 moved Melder_stopwatch here and made it call Melder_clock
* pb 2011/04/05 C++
*/
#include "melder.h"
#if defined (macintosh) || defined (UNIX)
#include <sys/time.h>
#elif defined (_WIN32)
#include <windows.h>
#endif
double Melder_clock (void) {
#if defined (macintosh) || defined (UNIX)
/*
* The clock counts the number of seconds elapsed since 1969.
*/
struct timeval timeVal;
struct timezone timeZone;
gettimeofday (& timeVal, & timeZone);
return timeVal. tv_sec + 1e-6 * timeVal. tv_usec;
#elif defined (_WIN32)
/*
* The clock counts the number of ticks since system start-up.
*/
static double clockFrequency = -1.0; // we can use a static, because the clock frequency does not change while the computer is running
if (clockFrequency == -1.0) { // not initialized?
LARGE_INTEGER clockFrequency_longlong;
QueryPerformanceFrequency (& clockFrequency_longlong); // returns 0 if the system does not have a performance counter
clockFrequency = (double) clockFrequency_longlong.QuadPart; // the compiler has to support 64-bit integers
}
if (clockFrequency == 0.0) { // this will be true if the system does not have a performance counter
return GetTickCount () / 1000.0; // fallback: only millisecond resolution, and potentially jumpy
}
LARGE_INTEGER clockCount;
QueryPerformanceCounter (& clockCount);
return (double) clockCount.QuadPart / clockFrequency;
#else
return 0;
#endif
}
double Melder_stopwatch (void) {
static double lastTime;
double now = Melder_clock ();
double timeElapsed = lastTime == 0 ? -1.0 : now - lastTime;
//Melder_casual ("%ld %ld %ld %lf %lf", now, lastTime, now - lastTime, (now - lastTime) / (double) CLOCKS_PER_SEC, timeElapsed);
lastTime = now;
return timeElapsed;
}
/* End of file melder_time.cpp */
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