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=head1 NAME |
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Coro::Util - various utility functions. |
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=head1 SYNOPSIS |
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use Coro::Util; |
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=head1 DESCRIPTION |
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This module implements various utility functions, mostly replacing perl |
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functions by non-blocking counterparts. |
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=over 4 |
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=cut |
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package Coro::Util; |
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no warnings qw(uninitialized); |
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#use Carp qw(croak); |
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use Coro::Handle; |
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use Coro::Semaphore; |
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use base 'Exporter'; |
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@EXPORT = qw( |
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gethostbyname gethostbyaddr |
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); |
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$VERSION = 0.6; |
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$MAXPARALLEL = 16; # max. number of parallel jobs |
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my $jobs = new Coro::Semaphore $MAXPARALLEL; |
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sub _do_asy(&;@) { |
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require POSIX; # just for _exit |
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my $sub = shift; |
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$jobs->down; |
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my $fh; |
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if (0 == open $fh, "-|") { |
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syswrite STDOUT, join "\0", map { unpack "H*", $_ } &$sub; |
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POSIX::_exit(0); |
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} |
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my $buf; |
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$fh = unblock $fh; |
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$fh->sysread($buf, 16384); |
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close $fh; |
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$jobs->up; |
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my @r = map { pack "H*", $_ } split /\0/, $buf; |
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wantarray ? @r : $r[0]; |
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} |
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=item gethostbyname, gethostbyaddr |
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Work exactly like their perl counterparts, but do not block. Currently |
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this is being implemented by forking, so it's not exactly low-cost. |
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=cut |
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my $netdns = 0 && eval { use Net::DNS 0.24 }; |
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sub gethostbyname($) { |
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if ($netdns) { |
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die; |
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} else { |
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_do_asy { gethostbyname $_[0] } @_; |
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} |
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} |
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sub gethostbyaddr($$) { |
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if ($netdns) { |
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die; |
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} else { |
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_do_asy { gethostbyaddr $_[0], $_[1] } @_; |
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} |
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} |
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1; |
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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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