65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/**
|
|
* @file clockWC.cpp
|
|
* Definitions for a simple class that implements an Ansi C wall clock timer
|
|
* (see \ref Cantera::clockWC).
|
|
*/
|
|
/*
|
|
* Copyright 2004 Sandia Corporation. Under the terms of Contract
|
|
* DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
|
|
* retains certain rights in this software.
|
|
* See file License.txt for licensing information.
|
|
*/
|
|
|
|
#include <time.h>
|
|
#include "cantera/base/clockWC.h"
|
|
namespace Cantera
|
|
{
|
|
|
|
|
|
clockWC::clockWC() :
|
|
last_num_ticks(clock()),
|
|
clock_rollovers(0u),
|
|
start_ticks(0),
|
|
inv_clocks_per_sec(1./(double)CLOCKS_PER_SEC),
|
|
clock_width((double)(1L<<((int)sizeof(clock_t)*8-2))*4./(double)CLOCKS_PER_SEC)
|
|
{
|
|
start_ticks = last_num_ticks;
|
|
}
|
|
|
|
/*
|
|
* Reinitialize the tick counters within the object
|
|
*/
|
|
double clockWC::start()
|
|
{
|
|
start_ticks = last_num_ticks = clock();
|
|
clock_rollovers = 0u;
|
|
return 0.0;
|
|
}
|
|
|
|
/*
|
|
* Returns system cpu and wall clock time in seconds. This
|
|
* is a strictly Ansi C timer, since clock() is defined as an
|
|
* Ansi C function. On some machines clock() returns type
|
|
* unsigned long (HP) and on others (SUN) it returns type long.
|
|
* An attempt to recover the actual time for clocks which have
|
|
* rolled over is made also. However, it only works if this
|
|
* function is called fairly regularily during
|
|
* the solution procedure.
|
|
*
|
|
* clock() -> returns the time in microseconds. Division by
|
|
* the macro CLOCKS_PER_SEC recovers the time in seconds.
|
|
*/
|
|
double clockWC::secondsWC()
|
|
{
|
|
clock_t num_ticks = clock();
|
|
if (num_ticks < last_num_ticks) {
|
|
clock_rollovers++;
|
|
}
|
|
double value = (num_ticks - start_ticks) * inv_clocks_per_sec;
|
|
if (clock_rollovers) {
|
|
value += clock_rollovers * clock_width;
|
|
}
|
|
last_num_ticks = num_ticks;
|
|
return value;
|
|
}
|
|
}
|