SIGCHLD not received

[Denis Bilenko]

Hi,

I have a weird test case (attached) where SIGCHLD is not being
received by libev. I don't quite understand if it's a

1) bug in how I use libev
2) bug in libev itself
3) bug in the OS

The work around I found that makes this test pass is to patch libev to
start a timer (active only when there are active child watchers) which
calls childcb periodically.

I tested it against the latest libev from CVS.

uname -a: Linux denis-laptop 3.2.0-23-generic-pae #36-Ubuntu SMP Tue
Apr 10 22:19:09 UTC 2012 i686 athlon i386 GNU/Linux

Cheers,
Denis.
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