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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// High_Res_Timer_Test.cpp
//
// = DESCRIPTION
// Simple test of ACE_High_Res_Timer.
//
// = AUTHOR
// David L. Levine <levine@cs.wustl.edu>
//
// ============================================================================
#include "test_config.h"
#include "ace/Log_Msg.h"
#include "ace/High_Res_Timer.h"
#include "ace/Sched_Params.h"
#include "ace/Get_Opt.h"
ACE_RCSID(tests, High_Res_Timer_Test, "$Id$")
static
u_int
check (const u_int interval, const u_int measured)
{
const u_int threshold = 25 /* percent */;
const u_int difference =
interval > measured ? interval - measured : measured - interval;
const u_int percentage_difference = difference * 100 / interval;
if (percentage_difference < threshold)
return 0;
else
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("The measured time of %u differs from ")
ACE_TEXT ("the interval of %u by %u percent.\n"),
measured,
interval,
percentage_difference),
1);
}
static
ACE_Time_Value
time_interval (const ACE_Time_Value &interval)
{
ACE_High_Res_Timer timer;
timer.start ();
ACE_OS::sleep (interval);
timer.stop ();
ACE_Time_Value measured;
timer.elapsed_time (measured);
return measured;
}
static
u_int
intervals [] = {0, 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000}; /* usec */
int
main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("High_Res_Timer_Test"));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("The ACE_High_Res_Timer scale factor is %u ")
ACE_TEXT ("1/microsecond\n"),
ACE_High_Res_Timer::global_scale_factor ()));
u_int errors = 0;
u_int iterations = 1;
ACE_Get_Opt getopt (argc, argv, ACE_TEXT ("i:"));
for (int c; (c = getopt ()) != -1; )
switch (c)
{
case 'i':
iterations = ACE_OS::atoi (getopt.optarg);
break;
}
// We don't check for errors if the interval is shorter than this
// value because the OS has a finite resolution anyway.
const u_int TIMER_RESOLUTION = 10000;
for (u_int i = 0; i < sizeof intervals / sizeof (u_int); ++i)
{
for (u_int j = 0; j < iterations; ++j)
{
const ACE_Time_Value interval (0, intervals[i]);
const ACE_Time_Value measured = time_interval (interval);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("interval: %u usec, measured: %u usec%s\n"),
interval.sec () * 1000000 + interval.usec (),
measured.sec () * 1000000 + measured.usec (),
intervals[i] <= TIMER_RESOLUTION ?
ACE_TEXT (" (interval and measured may differ)") : ACE_TEXT ("")));
if (intervals[i] > TIMER_RESOLUTION)
{
errors += check (interval.sec () * 1000000 + interval.usec (),
measured.sec () * 1000000 + measured.usec ());
// Don't check for error for intervals below 10 msec.
}
}
}
ACE_END_TEST;
return errors == 0 ? 0 : 1;
}
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