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Full Discussion: the problem of gettimeofday
Top Forums Programming the problem of gettimeofday Post 302220150 by dophine on Thursday 31st of July 2008 02:43:08 AM
Old 07-31-2008
the problem of gettimeofday
Hi all,

I just wrote a small problem to check gettimeofday in a multi-cores environment.

Code:
int timediff(double fTimeQvs, double fTimeTcp)
{
        int iTimeDiff;
        iTimeDiff = (((((int)fTimeQvs)/10000) - (((int)fTimeTcp)/10000)) * 3600) * 1000000;
        iTimeDiff += ((((((int)fTimeQvs)/100)%100) - ((((int)fTimeTcp)/100)%100)) * 60) * 1000000;
        iTimeDiff += ((((int)fTimeQvs)%100) - (((int)fTimeTcp)%100)) * 1000000;
        iTimeDiff += (((long long)(fTimeQvs*1000000))%1000000) - (((long long)(fTimeTcp*1000000))%1000000);

    return iTimeDiff;
}

int main()
{
        struct timeval cur;
        gettimeofday(&cur, 0);

        for(;;)
        {
                struct timeval new_time;
                gettimeofday(&new_time, 0);

                double diff = difftime(new_time.tv_sec,cur.tv_sec);
                if(diff > 1.0)
                        printf("Big:%ld.%ld,%ld.%ld,%lf\n",new_time.tv_sec,new_time.tv_sec, cur.tv_sec,cur.tv_usec,diff);
                else if(diff < 0.0)
                        printf("Small::%ld.%ld,%ld.%ld,%lf\n",new_time.tv_sec,new_time.tv_usec, cur.tv_sec,cur.tv_usec,diff);
                cur.tv_sec = new_time.tv_sec;
        }
        return 0;
}

Here is the result:
Small::1217485404.98014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.99014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.100014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.101013,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.102014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.103014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.104014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.105014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.106014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.107013,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.108013,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.109013,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.110014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.111014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.112014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.113014,1217489802.813903,-4398.000000
Big:1217489802.1217489802,1217485404.813903,4398.000000
Small::1217485404.114014,1217489802.813903,-4398.000000

so is there any way to overcome it?
 

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LEARN ABOUT DEBIAN

sundancer2

RSS Other Screensaver(1)				      General Commands Manual					  RSS Other Screensaver(1)

NAME

       sundancer2 - rotating stack of quads.

SYNOPSIS

       sundancer2  [--root/-r]	[--maxfps/-x number] [--vsync/-y number] [--dpms/-M number] [--quad_count/-q number] [--speed/-s number] [--trans-
       parency/-t number] [--foreground/-f number] [--background/-b number] [--reverse/-e] [--no-reverse/-E]

DESCRIPTION

       Neat rotation effects from rotation and skewing stack of transparent squares.

       Ported to Linux by Tugrul Galatali.

OPTIONS

       --root  Draw on the root window.

       --maxfps number
	       Set maximum frame rate.

       --vsync number
	       Limit redraws to specified number of vertical refreshes.  0 - 100.  Default: 1

       --dpms number
	       Stop rendering new frames if the display is not on.  0 - 1.  Default: 1

       --quad_count number
	       Set number of stacked quads.  1 - 300.  Default: 150

       --speed number
	       Rotational speed.  1 - 40.  Default: 20

       --transparency number
	       Percentage of transparency.  1 - 100.  Default: 75

       --foreground number
	       Color for the top of the heap using hex color codes.  000000 - ffffff.  Default: ffff00

       --background number
	       Color for the bottom of the heap using hex color codes.	000000 - ffffff.  Default: ff0000

       --reverse
	       Reverse rotation occasionally.  Default: False

ENVIRONMENT

       DISPLAY to get the default host and display number.

SEE ALSO

       X(1),

COPYRIGHT

       Copyright (C) 2002 by Dirk Songuer and Tugrul Galatali.

       Sundancer2 is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2  as  pub-
       lished by the Free Software Foundation.

       Sundancer2  is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABIL-
       ITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

AUTHOR

       Dirk Songuer <delax@sundancerinc.de> and Tugrul Galatali <tugrul@galatali.com>

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