kqueue client code, manually relaxing the signal mask for just the single kevent() call waiting for new events.

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   Felix Palmen :freebsd: :c64: (zirias@mastodon.bsd.cafe)'s status on Saturday, 12-Apr-2025 14:38:43 JST Felix Palmen :freebsd: :c64:

   First change since #swad 0.2 will actually be a (huge?) improvement to my #poser lib. So far, it was hardwired to use the good old #POSIX #select call. This is perfectly fine for handling around up to 100 (or at least less than 1000, YMMV) clients.

   Some #select implementations offer defining the upper limit for checked file descriptors. Added support for that.

   POSIX also specifies #poll, which has very similar #scalability issues, but slightly different. Added support for this as well.

   And then, I went on to add support for the #Linux-specific #epoll and #BSD-specific #kqueue (#FreeBSD, #NetBSD, #OpenBSD, ...) which are both designed to *solve* any scalability issues 🥳

   A little thing that slightly annoyed me about kqueue was that there's no support for temporarily changing the signal mask, so I had to do the silly dance shown in the screenshot. OTOH, it offers changing event filters and getting events in a single call, which I might try to even further optimize ... 😎

   #C #coding