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Full Discussion: How to check if another instance of the process is running
Top Forums Shell Programming and Scripting How to check if another instance of the process is running Post 76456 by sim on Tuesday 28th of June 2005 11:23:35 AM
Old 06-28-2005
your assumptions are correct. But i doubt if this will solve my problem because i had problems only when 2 instances of script1 were starting at the same instance (timestamp is same). according to what i understood, in this case also, both the instances can do the ps check and lock file creation at the same time (if file is created using touch command, it will not give any error even if the file exist). and two instances of the script 2 will be started and then the C++ program. Please correct me if i am wrong.
 

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LEARN ABOUT DEBIAN

passenger-status

passenger-status(8)					      Adminstration Commands					       passenger-status(8)

NAME

       passenger-status - inspect Phusion Passenger's internal status

SYNOPSIS

       passenger-status [pid]

DESCRIPTION

       passenger-status  looks	at the current status of a Phusion Passenger installation. It will locate Phusion Passenger automatically if it is
       running and will give you a list of instances if there is more than one Phusion	Passenger  instance  running.  You  can  then  select  the
       instance by specifying the relevant PID on the command line.

       The general information section shows the following details:

       max    The  maximum number of application instances that Phusion Passenger will spawn. This equals the value given for PassengerMaxPoolSize
	      in the configuration.

       count  The number of application instances that are currently alive. This value is always less than or equal to max.

       active The number of application instances that are currently processing requests. This value is always less than or equal to count.

       inactive
	      The number of application instances that are currently not processing requests, i.e. are idle. Idle application  instances  will	be
	      shutdown	after  a  while, as can be specified with PassengerPoolIdleTime in the configuration. The value of inactive equals count -
	      active.

       The applications section shows each application instance, which directory it belongs to. The sessions field shows how many HTTP client  are
       currently being processed by that application instance.

OPTIONS

       pid    The process ID of the Phusion Passenger instance you want to look at

SEE ALSO

       passenger-memory-stats(8), ps(1), top(1)

       User guide at http://www.modrails.com/documentation.html

AUTHOR

       Phusion Passenger is written by Phusion (http://www.phusion.nl)

       "Phusion" and "Phusion Passenger" are trademarks of Hongli Lai & Ninh Bui.

       This manual page was written by Neil Wilson <neil@brightbox.co.uk> for the Ubuntu project (but may be used by others).

Phusion Passenger							2.0						       passenger-status(8)
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