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=head1 NAME |
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Coro::Semaphore - non-binary semaphores |
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=head1 SYNOPSIS |
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use Coro::Semaphore; |
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$sig = new Coro::Semaphore [init]; |
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$sig->down; # wait for signal |
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# ... some other "thread" |
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$sig->up; |
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=head1 DESCRIPTION |
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=over 4 |
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=cut |
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package Coro::Semaphore; |
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use Coro::Process (); |
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$VERSION = 0.01; |
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sub new { |
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bless [defined $_[1] ? $_[1] : 1], $_[0]; |
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} |
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sub down { |
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my $self = shift; |
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while ($self->[0] <= 0) { |
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push @{$self->[1]}, $Coro::current; |
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Coro::Process::schedule; |
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} |
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--$self->[0]; |
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} |
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sub up { |
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my $self = shift; |
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if (++$self->[0] > 0) { |
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(shift @{$self->[1]})->ready if @{$self->[1]}; |
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} |
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} |
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sub try { |
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my $self = shift; |
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if ($self->[0] > 0) { |
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--$self->[0]; |
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return 1; |
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} else { |
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return 0; |
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} |
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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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