[GHC] #8684: hWaitForInput cannot be interrupted by async exceptions on unix

[GHC]

#8684: hWaitForInput cannot be interrupted by async exceptions on unix
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:  13497, 13525      |             Blocking:
 Related Tickets:  #12912, #13525    |  Differential Rev(s):  Phab:D42
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by nh2):

 Hmm, `interruptible yield` would be a workaround, but I think it wouldn't
 fix the key problem.

 It would fix only `hWaitForInput`/`ready`.

 But it looks like other safe foreign calls that are called in a tight loop
 that does not allocate cannot be `timeout`ed.

 It seems a proper solution would be to insert a `yield` right after /any/
 foreign call returns (at least in the non-threaded RTS).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8684#comment:21>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler