lkml.org 
[lkml]   [2004]   [Mar]   [17]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectScheduler Problem ????
FromEmmanuel Fleury <>
DateWed, 17 Mar 2004 15:20:13 +0100
Hi all,

I am running a 2.6.4 (with preemptible kernel activated). 
What I did is the following:

1) Compile the sched_test.c program (at the end of the mail):

[root@hermes sched]$ gcc -o sched_test sched_test.c

2) Set the priority of the root shell as the highest:
[root@hermes sched]$ ps
  PID TTY          TIME CMD
 1519 pts/0    00:00:00 bash
 2020 pts/0    00:00:00 ps
[root@hermes sched]$ chrt -f -p 99 1519

3) Run sched_test:
[root@hermes sched]$ chrt -f 10 ./sched_test 100
bye now.



Here during the execution of sched_test everything is frozen.


Did I do something wrong ????
sched_test.c
=============
#include <sys/time.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
  int end_time;
  struct timeval now;
  if (argc < 2) 
    {
      end_time = 1;
    }
  else
    {
      end_time = atoi(argv[1]);
    }
  gettimeofday(&now, NULL);

  end_time += now.tv_sec + 1;

  do{
    gettimeofday(&now, NULL);
  }while (now.tv_sec < end_time);
  printf("bye now.\n");
  return 0;
}
==========
Regards
-- 
Emmanuel Fleury

Computer Science Department, |  Office: B1-201
Aalborg University,          |  Phone:  +45 96 35 72 23
Fredriks Bajersvej 7E,       |  Fax:    +45 98 15 98 89
9220 Aalborg East, Denmark   |  Email:  fleury@cs.auc.dk
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:01    [from the cache]
©2003-2008