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=head1 NAME |
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Coro::Timer - simple timer package, independent of used event loops |
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=head1 SYNOPSIS |
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|
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use Coro::Timer qw(sleep timeout); |
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# nothing exported by default |
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|
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sleep 10; |
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=head1 DESCRIPTION |
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|
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This package implements a simple timer callback system which works |
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independent of the event loop mechanism used. If no event mechanism is |
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used, it is emulated. The C<Coro::Event> module overwrites functions with |
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versions better suited. |
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|
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This module is not subclassable. |
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|
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=over 4 |
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|
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=cut |
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|
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package Coro::Timer; |
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|
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no warnings; |
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|
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use Carp (); |
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use Exporter; |
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|
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use Coro (); |
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use AnyEvent (); |
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|
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$VERSION = "2.0"; |
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@EXPORT_OK = qw(timeout sleep); |
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|
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=item $flag = timeout $seconds; |
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This function will wake up the current coroutine after $seconds |
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seconds and sets $flag to true (it is false initially). If $flag goes |
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out of scope earlier nothing happens. This is used to implement the |
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C<timed_down>, C<timed_wait> etc. primitives. It is used like this: |
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|
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sub timed_wait { |
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my $timeout = Coro::Timer::timeout 60; |
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|
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while (condition false) { |
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schedule; # wait until woken up or timeout |
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return 0 if $timeout; # timed out |
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} |
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return 1; # condition satisfied |
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} |
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|
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=cut |
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|
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# deep magic, expecially the double indirection :(:( |
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sub timeout($) { |
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my $current = $Coro::current; |
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my $timeout; |
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bless { |
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timer => AnyEvent->timer (after => $_[0], cb => sub { |
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$timeout = 1; |
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$current->ready; |
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}), |
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timeout => \$timeout, |
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}, "Coro::Timer::Timeout"; |
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} |
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|
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package Coro::Timer::Timeout; |
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sub bool { ${$_[0]{timeout}} } |
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use overload 'bool' => \&bool, '0+' => \&bool; |
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|
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package Coro::Timer; |
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=item sleep $seconds |
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This function works like the built-in sleep, except maybe more precise |
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and, most important, without blocking other coroutines. |
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|
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=cut |
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|
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sub sleep { |
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my $current = $Coro::current; |
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my $timer = AnyEvent->timer (after => $_[0], cb => sub { $current->ready }); |
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Coro::schedule; |
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} |
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$Coro::idle = sub { |
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AnyEvent->one_event; |
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}; |
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1; |
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=back |
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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