Find active watchers

[Opera Wang]

Hi,
     I'm currently using the Perl binding EV, together with modules like 
IO::Stream, IO::AIO, Promises, & Mojo to implement a distributed test 
system. The issue I had was some times the main loop EV::run can't exit 
when all test done because some watchers are still active.  As watchers 
can be created on the fly, and some of them are created by other 
modules, so is there any way to tell what are the active watchers and 
where there were created?

      And thanks for the great work.

Thanks.
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