Perl - Interprocess Communication

Perl module P223

Interprocess Communication

Exercises, examples and other material relating to training module P223. This topic is presented on public course Perl Extra

Perl Extra - training course - Subjects not covered on regular public courses!

Perl Extra - Subjects not covered on regular public courses! Individual Perl users will need different advanced topics depending on their application. ...

http://www.wellho.net/course/pxfull.html [course]

Controlling multiple asynchronous processes in Perl

div class= introhead Running processes in parallel /div Perl is a great glueware language which includes a number of facilities that allow you to ...

http://www.wellho.net/solutions/perl-con ... -perl.html [longer article]

Perl Socket Programming Examples

It's always a pleasure to run private courses - for when a questions that's a little bit away from the normal comes up, I can take time to provide a full ...

http://www.wellho.net/mouth/1918_Per ... mples.html [short article]

Forking a process

print "hello world\n"; # Start five child processes at intervals of 1 second for (1..5) { $bill = (10,40,60,70,43,54,65)[$_]; sleep ...

http://www.wellho.net/resources/ex.php4?item=p223/f1.pl [code sample]

Perl - multiprocess applications

There are times that you'll be writing an application that you want to go off and perform task "x" and AT THE SAME TIME have it perform task "y", co-ordinating ...

http://www.wellho.net/mouth/604_Perl ... tions.html [short article]

Two processing in parallel (via fork) communicating (via a pipe)

#!/usr/bin/perl # h_report - host report print "About to rup and rusers.\n"; print "Please wait.\n"; pipe H_IN,H_OUT; unless ($pid = fork) { close H_IN; ...

http://www.wellho.net/resources/ex.php4?item=p223/h_report [code sample]

Parallel (forked) processes communicating via signals and pipes

# Forking out a series of processes which may take # a while to run. System waits for any signal to be # received back so that it can get the faster ...

http://www.wellho.net/resources/ex.php4?item=p223/pinga3 [code sample]

Overview

This topic is presented on public course Perl Extra

Examples from our training material

f1.pl	Forking a process
fdem	Forking in Perl, then communicating between processes
h_report	Two processing in parallel (via fork) communicating (via a pipe)
pinga2	Parallel (forked) processes communicating via signals and files
pinga3	Parallel (forked) processes communicating via signals and pipes
pingalong	Parallel (forked) processes communicating via pipes
pingpong	piping from another process
talker	Simple talker written in Perl
two_roles	Forking in Perl - two processes

Pictures

Forking a Perl Process, and pipe

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Overview.
forks.
Parent and child communications.
Pipes.
Other ways of communicating.
Signals.
pid files.
Transferring information.

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