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=head1 NAME |
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Coro::Signal - coroutine signals (binary semaphores) |
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=head1 SYNOPSIS |
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use Coro::Signal; |
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$sig = new Coro::Signal; |
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$sig->wait; # wait for signal |
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# ... some other "thread" |
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$sig->send; |
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=head1 DESCRIPTION |
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=over 4 |
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=cut |
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package Coro::Signal; |
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use Coro (); |
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$VERSION = 0.08; |
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=item $s = new Coro::Signal; |
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Create a new signal. |
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=cut |
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sub new { |
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# [flag, [pid's]] |
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bless [], $_[0]; |
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} |
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=item $s->wait |
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Wait for the signal to occur. Returns immediately if the signal has been sent before. |
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=cut |
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sub wait { |
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if ($_[0][0]) { |
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$_[0][0] = 0; |
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} else { |
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push @{$_[0][1]}, $Coro::current; |
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Coro::schedule; |
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} |
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} |
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=item $s->send |
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Send the signal, waking up a waiting process or remembering the signal. |
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=cut |
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sub send { |
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if (@{$_[0][1]}) { |
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(shift @{$_[0][1]})->ready; |
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} else { |
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$_[0][0] = 1; |
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} |
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} |
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=item $s->broadcast |
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Send the signal, waking up all waiting process. If no process is waiting the signal is lost. |
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=cut |
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sub broadcast { |
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(shift @{$_[0][1]})->ready while @{$_[0][1]}; |
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} |
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=item $s->awaited |
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Return true when the signal is beign awaited by some process. |
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=cut |
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sub awaited { |
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!!@{$_[0][1]}; |
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} |
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1; |
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=back |
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=head1 AUTHOR |
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Marc Lehmann <pcg@goof.com> |
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http://www.goof.com/pcg/marc/ |
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=cut |
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