Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Re: reliable lockfiles?

by atcroft (Monsignor)
on Jun 20, 2012 at 15:47 UTC ( #977387=note: print w/replies, xml ) Need Help??


in reply to reliable lockfiles?

Regarding the part of your comment regarding PIDs, I believe you can kill 0, $pid to determine if a signal can be sent to that PID. If so, then verify that the PID is for a process executing the same script/program (by parsing the result of a 'ps' command, or using a module such as Proc::ProcessTable).

# Untested use Proc::ProcessTable; my $tobj = new Proc::ProcessTable; my $proctable = $tobj->table(); my $pid = 0; for ( @$proctable ) { if ( $_->cmndline =~ m/$script_name/ ) { $pid = $_->pid; last; } } print $script_name, ( kill 0, $pid ? q{appears} : q{does not appear} ), q{ to be running}, qq{\n};

Hope that helps.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://977387]
help
Chatterbox?
[erix]: choroba I believe you ;)
[1nickt]: Corion I assume you are talking about Retry? Attempt doesn;t offer callbacks and has a much simpler interface. (Also written by someone I trust...)
[perldigious]: I train for long portaging/rowing trips by carrying my kayak to the river about a half mile from my house 2-3 times a week depending on weather... but due to a lingering winter, I haven't had long to train this year.

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (10)
As of 2017-05-24 12:58 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?