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Top Forums Shell Programming and Scripting How to check if another instance of the process is running Post 76443 by sim on Tuesday 28th of June 2005 10:54:26 AM
Old 06-28-2005
Hi Vino,

I tried using a temporary file with pids and creating a lock directory to check for another process instance. But in my situation, there is one more complication. The script which is invoking the C++ program exits even before the other process is completed. (Actually, this script is invoking the C++ executable using another script. this second script invokes the C++ program in the background and do not wait for the it to finish.) Hence, even if the lock file is deleted, the C++ program may be running.

Regards,
Sim
 

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SHLOCK(1)						      General Commands Manual							 SHLOCK(1)

NAME
shlock - create lock files for use in shell scripts SYNOPSIS
shlock -p pid -f name [ -b ] [ -u ] [ -c ] DESCRIPTION
Shlock tries to create a lock file named name and write the process ID pid into it. If the file already exists, shlock will read the process ID from the file and test to see if the process is currently running. If the process exists, then the file will not be created. Shlock exits with a zero status if it was able to create the lock file, or non-zero if the file refers to currently-active process. OPTIONS
-b Process IDs are normally read and written in ASCII. If the ``-b'' flag is used, then they will be written as a binary int. For compatibility with other systems, the ``-u'' flag is accepted as a synonym for ``-b'' since binary locks are used by many UUCP pack- ages. -c If the ``-c'' flag is used, then shlock will not create a lock file, but will instead use the file to see if the lock is held by another program. If the lock is valid, the program will exit with a non-zero status; if the lock is not valid (i.e., invoking shlock without the flag would have succeeded), then the program will exit with a zero status. EXAMPLES
The following example shows how shlock would be used within a shell script: LOCK=/var/run/innd/LOCK.send trap 'rm -f ${LOCK} ; exit 1' 1 2 3 15 if shlock -p $$ -f ${LOCK} ; then # Do appropriate work else echo Locked by `cat ${LOCK}` fi HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> after a description of HDB UUCP locking given by Peter Honeyman. This is revision 1.9, dated 1996/10/29. SHLOCK(1)
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