04-11-2006
dsberrf has a valid point, this would be a lengthy chapter in a book. Another point is that different kernels has different algorithms for scheduling. But briefly, the "clock" is a component that generates periodic interrupts. The interrupt routine does stuff when it is called by the clock. A major routine is called a certain number of times per second with 100 times per second being a common value. This major routine is called a "clock tick" (or "jiffy" on linux). A process' timeslice might be one tenth of a second so this would be represented as a 10. The timeslice is always some fixed number of "clock ticks". At each clock tick, it is decremented. When it hits zero, the scheduler will decide which process gets the cpu. If no other process wants the cpu, the process might get another timeslice.
There is a lot more to this, but I'm not going to write that lengthy chapter...
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LEARN ABOUT DEBIAN
padre::task::eval
Padre::Task::Eval(3pm) User Contributed Perl Documentation Padre::Task::Eval(3pm)
NAME
Padre::Task::Eval - Task for executing arbitrary code via a string eval
SYNOPSIS
my $task = Padre::Task::Eval->new(
prepare => '1 + 1',
run => 'my $foo = sub { 2 + 3 }; $foo->();',
finish => '$_[0]->{prepare}',
);
$task->prepare;
$task->run;
$task->finish;
DESCRIPTION
Padre::Task::Eval is a stub class used to implement testing and other miscellaneous functionality.
It takes three named string parameters matching each of the three execution phases. When each phase of the task is run, the string will be
eval'ed and the result will be stored in the same has key as the source string.
If the key does not exist at all, nothing will be executed for that phase.
Regardless of the execution result (or the non-execution of the phase) each phase will always return true. However, if the string eval
throws an exception it will escape the task object (although when run properly inside of a task handle it should be caught by the handle).
METHODS
This class contains now additional methods beyond the defaults provided by the Padre::Task API.
COPYRIGHT & LICENSE
Copyright 2008-2012 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 itself.
The full text of the license can be found in the LICENSE file included with this module.
perl v5.14.2 2012-06-27 Padre::Task::Eval(3pm)