--FghjlKmKF6
Content-Type: text/plain; charset=us-ascii
Content-Description: message body and .signature
Content-Transfer-Encoding: 7bit
Fred L. Drake, Jr. writes:
> I'd like people to run the attached C program and send the output to
OK, I've attached it this time. Sorry!
-Fred
--
Fred L. Drake, Jr. <fdrake at acm.org>
PythonLabs at Digital Creations
--FghjlKmKF6
Content-Type: text/plain
Content-Description: timer check program
Content-Disposition: inline;
filename="observation.c"
Content-Transfer-Encoding: 7bit
#include <stddef.h>
#include <sys/resource.h>
#include <sys/times.h>
/*
* This should be defined the same way Python defines it:
*
* Define if gettimeofday() does not have second (timezone) argument.
* This is the case on Motorola V4 (R40V4.2)
*/
/* #undef GETTIMEOFDAY_NO_TZ */
#ifdef GETTIMEOFDAY_NO_TZ
#define GETTIMEOFDAY(ptv) gettimeofday(ptv)
#else
#define GETTIMEOFDAY(ptv) gettimeofday((ptv), (struct timezone *)NULL)
#endif
static void
calibrate(int report)
{
unsigned long timeofday_diff = 0;
unsigned long rusage_diff = 0;
unsigned long timeofday_calls = 0;
unsigned long rusage_calls = 0;
struct rusage ru1, ru2;
struct timeval tv1, tv2;
GETTIMEOFDAY(&tv1);
while (1) {
GETTIMEOFDAY(&tv2);
++timeofday_calls;
if (tv1.tv_sec != tv2.tv_sec || tv1.tv_usec != tv2.tv_usec)
break;
}
if (tv1.tv_sec == tv2.tv_sec)
timeofday_diff = tv2.tv_usec - tv1.tv_usec;
else
timeofday_diff = (1000000 - tv1.tv_usec) + tv2.tv_usec;
getrusage(RUSAGE_SELF, &ru1);
while (1) {
getrusage(RUSAGE_SELF, &ru2);
++rusage_calls;
if (ru1.ru_utime.tv_sec != ru2.ru_utime.tv_sec) {
rusage_diff = ((1000000 - ru1.ru_utime.tv_usec)
+ ru2.ru_utime.tv_usec);
break;
}
else if (ru1.ru_utime.tv_usec != ru2.ru_utime.tv_usec) {
rusage_diff = ru2.ru_utime.tv_usec - ru1.ru_utime.tv_usec;
break;
}
else if (ru1.ru_stime.tv_sec != ru2.ru_stime.tv_sec) {
rusage_diff = ((1000000 - ru1.ru_stime.tv_usec)
+ ru2.ru_stime.tv_usec);
break;
}
else if (ru1.ru_stime.tv_usec != ru2.ru_stime.tv_usec) {
rusage_diff = ru2.ru_stime.tv_usec - ru1.ru_stime.tv_usec;
break;
}
}
if (report)
printf("timeofday: %lu (%lu calls), rusage: %lu (%lu calls)\n",
timeofday_diff, timeofday_calls, rusage_diff, rusage_calls);
}
int
main(int argc, char *argv[])
{
calibrate(0);
calibrate(0);
calibrate(1);
return 0;
}
--FghjlKmKF6--
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4