[Bug 43072] New: epoll & threads

[Bug 43072] New: epoll & threads

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=43072

           Summary: epoll & threads
           Product: Documentation
           Version: unspecified
    Kernel Version: n/a
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: arigo-SAGZdM4SFkLYtjvyW6yDsg@public.gmane.org
        Regression: No


The manpages of epoll do not mention the behavior in the presence of multiple
threads.  By trying it out, I found out that the following works: if one thread
does epoll_wait() on an epoll in which some fd was not registered at all, and
blocks; and later another thread does epoll_ctl() to add the fd; then the fd
will be reported by the original thread's epoll_wait() as soon as it meets the
condition.  This behavior is something that may be very useful in some
situations.  As far as I see, it cannot be achieved easily with select().  I
think that it should be officially mentioned in the manpages (provided it is
not an accident but works this way by design).

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[Bug 43072] epoll & threads

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=43072


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         AssignedTo|documentation_man-pages@ker |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
                   |nel-bugs.osdl.org           |




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