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=head1 NAME
Coro::BDB - truly asynchronous bdb access
=head1 SYNOPSIS
use Coro::BDB;
use BDB;
# can now use any of the bdb requests
=head1 DESCRIPTION
This module is an L<AnyEvent> user, you need to make sure that you use and
run a supported event loop.
This module implements a thin wrapper around the L<BDB> module: Each BDB
request that could block and doesn't get passed a callback will normally
block all coroutines. after loading this module, this will no longer be
the case (it provides a suitable sync prepare callback).
It will also register an AnyEvent watcher as soon as AnyEvent chooses an
event loop.
The AnyEvent watcher can be disabled by executing C<undef
$Coro::BDB::WATCHER>. Please notify the author of when and why you think
this was necessary.
This module does not export anything (unlike L<Coro::AIO>), as BDB already
supports leaving out the callback. (Unfortunately, it ties a C context
to each coroutine executing such a callback, so in the future, it might
export more efficient wrappers).
=over 4
=cut
package Coro::BDB;
use common::sense;
use BDB ();
use AnyEvent::BDB ();
use Coro ();
use Coro::AnyEvent ();
use base Exporter::;
our $VERSION = 6.57;
our $WATCHER;
BDB::set_sync_prepare {
my $cb = Coro::rouse_cb;
(
sub { $cb->($!) },
sub { $! = Coro::rouse_wait },
)
};
=back
=head1 SEE ALSO
L<BDB> of course.
=head1 AUTHOR/SUPPORT/CONTACT
Marc A. Lehmann <schmorp@schmorp.de>
http://software.schmorp.de/pkg/Coro.html
=cut
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