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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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Oops, IO::KQueue support was broken due to this missing
constant. Add a new ds-kqxs.t test case to ensure we
test the IO::KQueue path if IO::KQueue is available.
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EV_DISPATCH is actually a better match for EPOLLONESHOT
semantics than EV_ONESHOT in that it doesn't require EV_ADD
for every mod operation.
Blindly using EV_ADD everywhere forces the FreeBSD kernel to
do extra allocations up front, so it's best avoided.
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We don't need extra wakeups from the kernel when we know a
listener is already active.
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On Linux systems with epoll support, we don't want to be
clobbering defined subs in the t/ds-poll.t test; so use
OO ->method dispatch instead and require users to explicitly
import subs via EXPORT_OK.
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We don't need to code multiple event loops or have branches in
watch() if we can easily make the IO::KQueue-based interface
look like our lower-level epoll_* API.
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