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authorEric Wong <e@80x24.org>2019-11-27 01:33:33 +0000
committerEric Wong <e@80x24.org>2019-11-27 10:25:43 +0000
commitd6674af04cb74a4efd513d938bed8bf7ab2838eb (patch)
tree98e1924639d6ee8be3cd0bb4d614332a0a1cbef4 /Makefile.PL
parent1e44ee6d429b853a7a87ae58e56241c55ab8c306 (diff)
Our attempt at using a self-pipe in signal handlers was
ineffective, since pure Perl code execution is deferred
and Perl doesn't use an internal self-pipe/eventfd.  In
retrospect, I actually prefer the simplicity of Perl in
this regard...

We can use sigprocmask() from Perl, so we can introduce
signalfd(2) and EVFILT_SIGNAL support on Linux and *BSD-based
systems, respectively.  These OS primitives allow us to avoid a
race where Perl checks for signals right before epoll_wait() or
kevent() puts the process to sleep.

The (few) systems nowadays without signalfd(2) or IO::KQueue
will now see wakeups every second to avoid missed signals.
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