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Full Discussion: AIX - "prevent script from running twice" issue
Operating Systems AIX AIX - "prevent script from running twice" issue Post 302475033 by bakunin on Friday 26th of November 2010 08:49:08 AM
Old 11-26-2010
To be honest i don't understand the problem. The method with the PID file (or, to show that i can use the terminology like any real computer scientist - semaphore) is a standard method of interprocess communication:

Code:
#! /bin/ksh

typeset -i iProcNr="$$"                           # our own process nr
typeset    fPIDFile="/some/procfile.pid"

if [ -f "$fPIDFile" ] ; then
     print -u2 "ERROR: script already running, exiting."
     exit 1
else
     print - "$iProcNr" > "$fPIDFile"
fi

.... here goes the rest of your code ....

rm -f "$fPIDFile"
exit 0

This should work without under any circumstance, regardless of wether the system is fast or not.

I hope this helps.

bakunin
 

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LEARN ABOUT V7

let

let(1)                                                             User Commands                                                            let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

DESCRIPTION

   ksh
       Each arg is a separate "arithmetic expression" to be evaluated.

EXIT STATUS

       The following exit values are returned:

       0        The value of the last expression is non-zero.

       1        The value of the last expression is zero.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), set(1), typeset(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                             let(1)
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