---
name: "Padre::SlaveDriver"
section: "3pm"
platform: "linux"
package: "padre"
version: "0.63.ds1-1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/Padre::SlaveDriver"
---

# Padre::SlaveDriver(3pm)

Padre thread spawning

## NAME

Padre::SlaveDriver - Padre thread spawning

## SYNOPSIS

```
  use Padre::SlaveDriver;
  my $sd = Padre::SlaveDriver->new();
  my $slave_thread = $sd->spawn($taskManager);
```

## DESCRIPTION

Padre uses threads for asynchronous background operations which may take so long that they would make the GUI unresponsive if run in the main (GUI) thread.

This class is a helper that will spawn new worker on demand. It keeps a single model thread around that was (or should have been) created very early in the start-up process of Padre. Therefore, the threads' memory consumption will be significantly lower than if one created new worker (slave) threads from the main Padre thread.

Maintainer note: This module must not load any other part of Padre and should generally be kept low on memory overhead.

## INTERFACE

### Class Methods

*"new"*

The constructor returns a `"Padre::SlaveDriver"` object. `"Padre::SlaveDriver"` is a singleton.

An object is instantiated when the editor object is created.

### Object methods

*"spawn"*

Takes the Padre::TaskManager object as argument. Returns a new worker thread object.

*"task\_queue"*

Returns the task queue (`"Thread::Queue"` object) for use by the Padre::TaskManager for passing processing tasks to the worker threads.

This queue is instantiated by the slave driver because it needs to be available early for passing to the master thread.

*"cleanup"*

Reaps the master thread. Will be called by the `"TaskManager"` on shutdown and on global destruction.

## TO DO

What if the computer can't keep up with the queued jobs? This needs some consideration and probably, the `"schedule()"` call needs to block once the queue is *"full"*. However, it's not clear how this can work if the Wx `"MainLoop"` isn't reached for processing finish events.

Polling services *aliveness* in a useful way, something a `"Wx::Taskmanager"` might like to display. Ability to selectively kill tasks/services

## SEE ALSO

The base class of all *"work units"* is Padre::Task.

## AUTHOR

Steffen Mueller `"smueller@cpan.org"`

## COPYRIGHT AND LICENSE

Copyright 2008-2010 The Padre development team as listed in Padre.pm.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5 itself.