[Bug 238675] POSIX timer (timer_create) limit is too low (32)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238675

            Bug ID: 238675
           Summary: POSIX timer (timer_create) limit is too low (32)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

epoll-shim https://github.com/jiixyj/epoll-shim implements the Linux timerfd
API via threads and POSIX timers.

libwayland-server allocates a timerfd per client.

sys/timers.h defines TIMER_MAX as 32.

As a result.. you can only run 32 Wayland clients! :D And I've started hitting
this limit in practice (especially with many WebKit processes).

Looks like on Linux, the limit of timers is RLIMIT_SIGPENDING which is 16382 by
default:
https://stackoverflow.com/questions/11903920/boost-deadline-timer-max-number-of-timers-in-linux

Our limit should be raised.

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