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Full Discussion: sleep command off by a second
Top Forums UNIX for Dummies Questions & Answers sleep command off by a second Post 302510670 by Perderabo on Monday 4th of April 2011 03:12:39 PM
Old 04-04-2011
Your loop contains, in this case, a sleep 5 command. The rest of the loop also requires a little bit of time to run. This is especially true if the OS has another program (like cron) that suddenly starts to run. If you start your script near the beginning of a second you might have enough excess milliseconds to handle everything else. But if you start the loop toward the end of a second that might not be true.
 

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sleep

sleep(3C)																 sleep(3C)

NAME

       sleep() - suspend execution for interval

SYNOPSIS

DESCRIPTION

       suspends the current process from execution for the number of seconds specified by the argument.

       Actual suspension time can be less than that requested for two reasons:

	 o  Scheduled wakeups occur at fixed 1 second intervals (on the second, according to an internal clock), and

	 o  Any caught signal terminates the sleep following execution of that signal's catching routine.

       Suspension time can be an arbitrary amount longer than requested due to the scheduling of other activity in the system.	The value returned
       by is the "unslept" amount (the requested time minus the time actually slept) in case the caller had an alarm set to go	off  earlier  than
       the end of the requested time, or premature arousal due to another caught signal.

       seconds must be less than 2^31.

APPLICATION USAGE

       If a is generated for a multithreaded process, it may not be delivered to a thread currently in See the sigwait(2) manpage for details.

SEE ALSO

       sigwait(2), signal(5), thread_safety(5).

STANDARDS CONFORMANCE

																	 sleep(3C)
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