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Full Discussion: Script function which checks if itself is already running
Top Forums Shell Programming and Scripting Script function which checks if itself is already running Post 302821911 by landossa on Sunday 16th of June 2013 04:32:37 AM
Old 06-16-2013
Script function which checks if itself is already running
Hi All,

I have a cron job set up which is set to run every 10 seconds.
What I need to do is have the script do a check to see if it is already running such that if it is running it wont fire up additional instances and processes according to its normal process.

For example if I have a script which checks to see if a file exists, and if exists, does a copy or move function of the file to another location, and then runs another process on it. If it is a large file that takes a long time to copy, and/or the other processes which I run on it takes a long time to complete, I don't want it to automatically fire up another instance of itself every 10 seconds.

So, lets say I have a script like the following: (and this isn't proper code, but just to illustrate the functions)

Code:
#!/bin/bash
#

1) Check to see if I am already running, and if so exit.

2) Check to see if file exists, and if it does process it.

EOF

What I am looking for is some way to determine if the script is running as in function 1.

Does anyone have any ideas how to achive this?

thanks,
landos
 

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LEARN ABOUT PHP

set_time_limit

SET_TIME_LIMIT(3)							 1							 SET_TIME_LIMIT(3)

set_time_limit - Limits the maximum execution time

SYNOPSIS

       bool set_time_limit (int  $seconds)

DESCRIPTION

	Set  the  number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 sec-
       onds or, if it exists, the max_execution_time value defined in the php.ini.

	When called, set_time_limit(3) restarts the timeout counter from zero. In other words, if the timeout is the default 30  seconds,  and	25
       seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.

PARAMETERS

	      o $seconds
		- The maximum execution time, in seconds. If set to zero, no time limit is imposed.

RETURN VALUES

	Returns TRUE on success, or FALSE on failure.

NOTES

       Warning

	       This  function  has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing
	      the time limit in the php.ini.

       Note

	       The set_time_limit(3) function and the configuration directive max_execution_time only affect the  execution  time  of  the  script
	      itself.  Any  time  spent  on activity that happens outside the execution of the script such as system calls using system(3), stream
	      operations, database queries, etc. is not included when determining the maximum time that the script has been running. This  is  not
	      true on Windows where the measured time is real.

SEE ALSO

       max_execution_time, max_input_time.

PHP Documentation Group 													 SET_TIME_LIMIT(3)
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