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=head1 NAME |
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Coro::BDB - truly asynchronous bdb access |
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=head1 SYNOPSIS |
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use BDB; |
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use Coro::BDB; |
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# can now use any of the bdb requests |
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=head1 DESCRIPTION |
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This module implements a thin wrapper around the L<BDB|BDB> module. |
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Each BDB request that could block and doesn't get passed a callback will |
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normally block all coroutines. after loading this module, this will no |
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longer be the case. |
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It will also register an AnyEvent handler (this will be done when the |
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module gets loaded and thus detects the event model at the same time, so |
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you need to laod your event module before Coro::BDB). |
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This module does not export anything (unlike Coro::AIO), as BDB already |
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supports leaving out the callback. |
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The AnyEvent watcher can be disabled by executing C<undef |
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$Coro::BDB::WATCHER>. Please notify the author of when and why you think |
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this was necessary. |
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=over 4 |
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=cut |
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package Coro::BDB; |
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no warnings; |
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use strict; |
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use Coro (); |
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use AnyEvent; |
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use BDB (); |
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use base Exporter::; |
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our $VERSION = 4.6; |
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our $WATCHER; |
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if (AnyEvent::detect =~ /^AnyEvent::Impl::(?:Coro)?EV$/) { |
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$WATCHER = EV::io (BDB::poll_fileno, &EV::READ, \&BDB::poll_cb); |
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} else { |
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our $FH; open $FH, "<&=" . BDB::poll_fileno; |
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$WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
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} |
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BDB::set_sync_prepare { |
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my $status; |
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my $current = $Coro::current; |
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( |
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sub { |
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$status = $!; |
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$current->ready; undef $current; |
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}, |
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sub { |
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Coro::schedule while defined $current; |
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$! = $status; |
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}, |
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) |
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}; |
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=back |
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=head1 SEE ALSO |
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L<BDB> of course. |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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