starting processes with timeout? Post: 302072791

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Top Forums UNIX for Dummies Questions & Answers starting processes with timeout? Post 302072791 by Perderabo on Sunday 7th of May 2006 11:58:44 AM

05-07-2006

Administrator Emeritus

This is an odd thing to do. But I just got this script to work:

Code:

#! /usr/bin/ksh

sleep 200 ; kill -term -$$ &
sleep 7
kill -term -$$

One of my sleep processes represents a process that might run too long. The other sleep process is the timer. Either process could play either role, but I envisioned that first line as the timer and the second as the process to be timed. One of the processes will probably finish first and then run the "kill -term -$$". This will kill the process group. On a multiprocessor system simultaneous kills may occur, but the kernel will ensure that they happen serially. There is no race condition here. This depends on the shell putting all processes in a script into a single process group. So neither sleep process could be replaced with another shell script because it would become a new process group.

Perderabo

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LEARN ABOUT PLAN9

kill

KILL(1) 						      General Commands Manual							   KILL(1)

NAME

       kill, broke - print commands to kill processes

SYNOPSIS

       kill name

       broke

DESCRIPTION

       Kill  prints  commands  that  will cause all processes called name and owned by the current user to be terminated.  Use the send command of
       81/2(1), or pipe the output of kill into rc(1) to execute the commands.

       Kill suggests sending a kill note to the process; the same message delivered to the process's ctl file (see proc(3)) is a surer,  if  heavy
       handed, kill, but is necessary if the offending process is ignoring notes.

       Broke  prints  commands	that  will  cause all processes in the Broken state and owned by the current user to go away.  When a process dies
       because of an error caught by the system, it may linger in the Broken state to allow examination with a debugger.  Executing  the  commands
       printed by broke lets the system reclaim the resources used by the broken processes.

SOURCE

       /rc/bin/kill
       /rc/bin/broke

SEE ALSO

       ps(1), stop(1), proc(3)

																	   KILL(1)

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