IO::Async::Loop::UV - use IO::Async with UV


 use IO::Async::Loop::UV;

 my $loop = IO::Async::Loop::UV->new();

 $loop->add( ... );

 $loop->add( IO::Async::Signal->new(
       name => 'HUP',
       on_receipt => sub { ... },
 ) );



This subclass of IO::Async::Loop uses UV to perform its work.

As both UV and the underlying libuv are quite new, this module currently has a few shortcomings and limitations. See the "BUGS" section.


  • libuv does not provide a way to inspect the POLLUP status bit, so some types of file descriptor cannot provide EOF condition. This causes a unit-test failure.

  • libuv attempts to invoke a close callback when closing watch handles, even if one is not defined. This causes the next UV::run_once() call after a handle has been closed to always return immediately. This should not cause a problem in practice, but does cause a unit-test failure.

  • UV does not wrap signal or child-process watch abilities of libuv, so these are currently emulated by the Loop's built-in signal-pipe mechanism. Because of this, signal or child-process watching cannot be shared by both IO::Async and UV-using code at the same time.


Paul Evans <>