[Trilug-ontopic] perl and threads

Ben Coughenour benc at alumni.psu.edu
Fri Mar 11 10:11:02 EST 2011

Although Brian's suggestion is what I would do personally.  :)


On 3/11/2011 10:02 AM, Ben Coughenour wrote:
> The Perl thread tutorial has lots of example code and is online. 
> http://perldoc.perl.org/perlthrtut.html  It has sections on locking 
> and semaphores that you can use to control access to the log file.
> Ben
> On 3/10/2011 5:07 PM, Greg Brown wrote:
>> Ok, I've GOT to get my scripts using threads.  Here's what I've got 
>> and what I'd like to do:
>> source: a 3000 line file with hostnames, IP addrs, etc.
>> what script does: logs into each device using Net::SSH::Expect that 
>> makes configuration changes to IOS devices (uses Net::SSH::Expect 
>> rather than expect.pm <http://expect.pm> because one of our NMS 
>> servers is a windows box and the scripts have to run across all NMS 
>> servers.. sigh)
>> how script does it: the guts of the script, the real work, is all 
>> done in a subscript.  The main portion of the script opens the file 
>> and creates a foreach loop to process each line (and device) one at 
>> at time.  As you might imagine this script takes a long time to 
>> complete.  The subscript returns a message to the main script that is 
>> written to a log file ("login failed", "change implemented", etc).
>> what I'd like to do: take a group of devices, say five at at time, 
>> and launch the subscript as a thread so I can process more than one 
>> device at a time.  I would imagine this would involve some kind of 
>> flock on the log file so two threads couldn't return at the same 
>> time.  John B. sent me some instructions how to thread a perl script 
>> a while back but now I can't find it.
>> Does anyone know of a perl book with good and clear examples that use 
>> threads?
>> Greg
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