POSIX compliance... Post: 302976888

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Operating Systems OS X (Apple) POSIX compliance... Post 302976888 by wisecracker on Thursday 7th of July 2016 03:56:42 PM

07-07-2016

Registered User

Well I have been experimenting with sleep <secs> to give me a smaller time accurate to about + or - 5mS on this MacBook Pro, OSX 10.7.5.

It would be good enough for the Egg_Timer.sh and passes the ShellCheck test.

It is fully posix compliant with SLEEPs unity seconds timer only.

Boy am I gonna get some flak over this one, (yes I bend the rules a little)... ;o)

Code:

#!/bin/sh
# delay.sh <secs> <millisecs[0-999]>
secs="$1"
millisecs=$( awk -v mS="$2" -v correction=0.94 ' BEGIN { print (( mS / 2 ) * correction ); } ' )
millisecs="${millisecs%.*}"

# Accuracy on my MBP OSX 10.7.5 + or - 5mS of FSD.
mS()
{
	loop=0
	while [ "$loop" -le "$millisecs" ]
	do
		sleep 0
		wait
		loop=$(( loop + 1 ))
	done
}
# Test the mS function only.
time mS
sleep "$secs"

As I quoted in a previous post I could create a resonably accurate timer using 'afplay', 'aplay' or '/dev/dsp'. I might use afplay and make it Apple dedicated...

Thanks Don for the info...

I await the flak... ;o)

wisecracker

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tk_strictmotif

Tk_StrictMotif(3TK)					       Tk Library Procedures					       Tk_StrictMotif(3TK)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_StrictMotif - Return value of tk_strictMotif variable

SYNOPSIS

       #include <tk.h>

       int
       Tk_StrictMotif(tkwin)

ARGUMENTS

       Tk_Window   tkwin   (in)      Token for window.
_________________________________________________________________

DESCRIPTION

       This  procedure returns the current value of the tk_strictMotif variable in the interpreter associated with tkwin's application.  The value
       is returned as an integer that is either 0 or 1.  1 means that strict Motif compliance has been requested, so anything that is not part	of
       the Motif specification should be avoided.  0 means that ``Motif-like'' is good enough, and extra features are welcome.

       This  procedure uses a link to the Tcl variable to provide much faster access to the variable's value than could be had by calling Tcl_Get-
       Var.

KEYWORDS

       Motif compliance, tk_strictMotif variable

ATTRIBUTES

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

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTk	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tk is available on http://opensolaris.org.

Tk									4.0						       Tk_StrictMotif(3TK)