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Full Discussion: How to periodically execute a function in C ??
Top Forums Programming How to periodically execute a function in C ?? Post 302152149 by WebKruncher on Tuesday 18th of December 2007 10:07:55 PM
Old 12-18-2007
I disagree
Quote:
Originally Posted by porter
Using a high speed polling loop with a 10 micro second delay (apparently to avoid a race condition) to schedule tasks that occur in seconds.

This can be tuned anyway the user wants.

That means for every second, you will wake up and execute the loop 100,000 times before you will ever find anything to do.

Simply using a variable for the usleep() parameter that was the number of microseconds between now and the next timed event would have been an excellent solution.
True, but then the function can only act as a cron manager. The object is meant to be used from within a game loop. That seems far more useful than a discrete utility designed only to sleep for specified number of milli seconds. Besides, the simple sleep method may not take into account how long it takes to execute the function before triggering again.

Anyway, it's just one of many ways to accomplish the task at hand. I didn't mean to strike a nerve.

I spent 3 months on something like this a few years ago. QA beat up on it pretty hard, it seemed to hold up well.
 

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LEARN ABOUT MINIX

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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