POSIX compliance... Post: 302976999

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Operating Systems OS X (Apple) POSIX compliance... Post 302976999 by drl on Sunday 10th of July 2016 09:43:01 PM

07-10-2016

Registered User

Hi.

Also:

Code:

            For delays of finer granularity than one second, the Time::HiRes
            module (from CPAN, and starting from Perl 5.8 part of the standard
            distribution) provides usleep(). You may also use Perl's
            four-argument version of select() leaving the first three
            arguments undefined, or you might be able to use the "syscall"
            interface to access setitimer(2) if your system supports it. See
            perlfaq8 for details.

Excerpt from perldoc -f sleep

For example:

Code:

#!/usr/bin/env perl

# @(#) p1       Demonstrate usleep;

use Time::HiRes qw( usleep nanosleep );

$microseconds = 2500000;
usleep($microseconds);

# nanosleep ($nanoseconds);

exit(0);

which would produce something like:

Code:

time ./p1

real    0m2.514s
user    0m0.008s
sys     0m0.000s

On an older OS/X:

Code:

OS, ker|rel, machine: Apple/BSD, Darwin 9.8.0, Power Macintosh
Distribution        : Mac OS X 10.5.8 (leopard, workstation)
perl 5.8.8

real    0m2.578s
user    0m0.045s
sys     0m0.021s

Best wishes ... cheers, drl

Last edited by drl; 07-10-2016 at 11:02 PM..

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usleep

usleep(3C)						   Standard C Library Functions 						usleep(3C)

NAME

       usleep - suspend execution for interval in microseconds

SYNOPSIS

       #include <unistd.h>

       int usleep(useconds_t useconds);

DESCRIPTION

       The usleep() function suspends the caller from execution for the number of microseconds specified by the useconds argument. The actual sus-
       pension time might be less than requested because any caught signal will terminate usleep() following execution of that	signal's  catching
       routine.  The suspension time might be longer than requested by an arbitrary amount because of the scheduling of other activity in the sys-
       tem.

       If the value of useconds is 0, then the call has no effect.

       The use of the usleep() function has no effect on the action or blockage of any signal. In  a  multithreaded  process,  only  the  invoking
       thread is suspended from execution.

RETURN VALUES

       On completion, usleep() returns 0. There are no error retruns.

ERRORS

       No errors are returned.

USAGE

       The usleep() function is included for its historical usage.  The nanosleep(3C) function is preferred over this function.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nanosleep(3C), sleep(3C), attributes(5), standards(5)

SunOS 5.11							    5 Feb 2008								usleep(3C)

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usleep