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Full Discussion: signal handling question
Top Forums Programming signal handling question Post 302199772 by fox_hound_33 on Tuesday 27th of May 2008 10:43:15 PM
Old 05-27-2008
I get what you guys mean.

I ran some test code using usleep and found some interesting results.
When i put usleep to 0.1secs, the actual sleeping time varies from the set point (0.1secs) with an error of about +5%. The same error percentage jumps to about +40% when i put usleep to 0.01sec and the same error jumps to about +300%(!!!!) when i put usleep to 0.001sec.

Looks like as the timer resolution is brought down the error keeps increasing. Could be due to system timer resolution as mentioned as well as the priority based scheduling employed by linux.

Anyway thanks a lot guys.
 

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LEARN ABOUT SUSE

sleep

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME

       sleep - Sleep for the specified number of seconds

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION

       sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.

RETURN VALUE

       Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.

CONFORMING TO

       POSIX.1-2001.

BUGS

       sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.

       Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.

SEE ALSO

       alarm(2), nanosleep(2), signal(2), signal(7)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-02-03								  SLEEP(3)
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