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=head1 NAME

Lucy::Store::LockErr - Lock exception.

=head1 SYNOPSIS

    while (1) {
        my $bg_merger = eval {
            Lucy::Index::BackgroundMerger->new( index => $index );
        };
        if ( blessed($@) and $@->isa("Lucy::Store::LockErr") ) {
            warn "Retrying...\n";
        }
        elsif (!$bg_merger) {
            # Re-throw.
            die "Failed to open BackgroundMerger: $@";
        }
        ...
    }



=head1 DESCRIPTION

LockErr is a subclass of L<Err|Clownfish::Err> which indicates
that a file locking problem occurred.





=head1 INHERITANCE

Lucy::Store::LockErr isa Clownfish::Err isa Clownfish::Obj.


=cut