Start of the time slice

Start of the time slice

[Nagy Imre (Vecsés)]

Dear List,

Excuse me, my English is limited, but I try to formulate clearly.

I would like to konw how many unexpired time is in my process. The normal
time slice (10ms) is enough for me, but I want to get run my function right
at the start of time slice. 

        _______________           ______________
____ ... 10 ms         __ . . . __  10 ms       ___

        |my f()                   |my f()


main()

{
.
.
.

while(1) {
   f();
}
.
.
.

Best regards,

Imre Nagy



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Re: Start of the time slice

[Glynn Clements]

Nagy Imre (Vecs^[-Bés) wrote:^[-A

> Excuse me, my English is limited, but I try to formulate clearly.
> 
> I would like to konw how many unexpired time is in my process. The normal
> time slice (10ms) is enough for me, but I want to get run my function right
> at the start of time slice. 

Try calling sched_yield(), or nanosleep() with a delay of 1ns.

-- 
Glynn Clements <glynn.clements@virgin.net>
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Re: Start of the time slice

[J.]

On Mon, 5 Jul 2004, [iso-8859-2] Nagy Imre (Vecsés) wrote:
> Dear List,
> 
> Excuse me, my English is limited, but I try to formulate clearly.
> 
> I would like to konw how many unexpired time is in my process. The normal
> time slice (10ms) is enough for me, but I want to get run my function right
> at the start of time slice. 
>         _______________           ______________
> ____ ... 10 ms         __ . . . __  10 ms       ___
> 
>         |my f()                   |my f()
> 
> main()
> 
> {
> .
> 
> while(1) {
>    f();
> }
> .
> 
> Best regards,
> 
> Imre Nagy

I am not quite sure what your question is, but my best guess is that you
are asking how to time parts of your c code ??

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>

#define CPU_TIME (getrusage(RUSAGE_SELF,&ruse), ruse.ru_utime.tv_sec + \
  ruse.ru_stime.tv_sec + 1e-6 * \
  (ruse.ru_utime.tv_usec + ruse.ru_stime.tv_usec))

/* get resource limits and usage */
extern int getrusage();
struct rusage ruse;

int main(void) {
 double first, second;
 time_t start, end;

 /* record start time... */
 time(&start);
 first = CPU_TIME;

 /* produce some cpu cycles... */
 /* put your code to be timed here.. */
 /* .... */

 /* end time.. */
 second = CPU_TIME;
 time(&end);

 /* print the results */
 printf("cpu  : %.2f secs\n", second - first); 
 printf("user : %d secs\n", (int)(end - start));
}

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