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package AnyEvent::Semaphore; |
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our $VERSION = '0.01'; |
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28801
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use strict; |
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use warnings; |
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991
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use AE; |
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11289
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use Scalar::Util (); |
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use Method::WeakCallback qw(weak_method_callback); |
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6235
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# internal representation of watcher is an array [$semaphore, $cb] |
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sub new { |
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my ($class, $size) = @_; |
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my $sem = { size => $size || 1, |
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holes => 0, |
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running => 0, |
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watchers => [] }; |
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0
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$sem->{schedule_cb} = weak_method_callback($sem, '_schedule'), |
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bless $sem, $class; |
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} |
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sub size { |
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my $sem = shift; |
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if (@_) { |
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$sem->{size} = shift; |
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&AE::postpone($sem->{schedule_cb}); |
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} |
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0
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$sem->{size}; |
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} |
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sub running { shift->{running} } |
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sub down { |
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0
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return unless defined $_[1]; |
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my ($sem) = @_; |
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0
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my $watchers = $sem->{watchers}; |
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my $w = [@_]; |
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bless $w, 'AnyEvent::Semaphore::Watcher'; |
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push @{$watchers}, $w; |
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Scalar::Util::weaken($watchers->[-1]); |
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&AE::postpone($sem->{schedule_cb}); |
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0
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$w; |
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} |
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sub _schedule { |
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0
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my $sem = shift; |
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my $watchers = $sem->{watchers}; |
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0
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while ($sem->{size} > $sem->{running}) { |
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0
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if (defined (my $w = shift @$watchers)) { |
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$sem->{running}++; |
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my ($cb, @args) = splice @$w, 1; |
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bless $w, 'AnyEvent::Semaphore::Down'; |
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$cb->(@args); |
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} |
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else { |
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0
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0
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@$watchers or return; |
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} |
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} |
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} |
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63
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sub AnyEvent::Semaphore::Watcher::DESTROY { |
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0
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0
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local ($!, $@, $SIG{__DIE__}); |
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0
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eval { |
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0
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my $watcher = shift; |
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0
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my $sem = $watcher->[0]; |
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0
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my $holes = ++$sem->{holes}; |
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0
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my $watchers = $sem->{watchers}; |
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0
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0
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0
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if ($holes > 100 and $holes * 2 > @$watchers) { |
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0
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@{$sem->{watchers}} = grep defined, @$watchers; |
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0
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72
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0
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Scalar::Util::weaken $_ for @$watchers; |
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0
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$sem->{holes} = 0; |
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} |
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} |
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} |
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78
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sub AnyEvent::Semaphore::Down::DESTROY { |
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0
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0
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local ($!, $@, $SIG{__DIE__}); |
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0
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eval { |
81
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0
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my $sem = shift->[0]; |
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0
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$sem->{running}--; |
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0
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&AE::postpone($sem->{schedule_cb}) |
84
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} |
85
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} |
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87
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1; |
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89
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__END__ |