[GHC] #10736: threadWaitRead/registerFd unusable

[GHC]

#10736: threadWaitRead/registerFd unusable
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        Reporter:  mboes             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by bgamari):

 What operating system is this on? The trouble is that the behavior of the
 functions backing the event manager are a bit platform-specific (in this
 way, it's a bit of a leaky abstraction, although I'm not sure we can do
 much better). Moreover, the platforms' documentation in this area tends to
 be quite poor, even in the case of Linux.

 In this particular case, you are running into the fact that `epoll` is
 [http://stackoverflow.com/questions/8057892/epoll-on-regular-files not]
 [http://stackoverflow.com/questions/8645721/why-does-select-select-work-
 with-disk-files-but-not-epoll?lq=1 supported] on regular files (the fact
 that this answer refers to the kernel's `eventpoll.c` for a definitive
 answer is an indication of just how lacking the documentation is in this
 area).

 I would like to improve the documentation for the event manager
 interfaces, but it require time to sort out where the relevant information
 can be found in the various platform documentation sources.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10736#comment:1>
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