[GHC] #8307: iOS patch: fix hangs in threaded runtime

[GHC]

#8307: iOS patch: fix hangs in threaded runtime
-------------------------------+-------------------------------------------
        Reporter:  lukexi      |            Owner:
            Type:  bug         |           Status:  patch
        Priority:  normal      |        Milestone:  7.8.1
       Component:              |          Version:  7.7
  libraries/base               |         Keywords:
      Resolution:              |     Architecture:  arm
Operating System:  Other       |       Difficulty:  Easy (less than 1 hour)
 Type of failure:  Runtime     |       Blocked By:
  crash                        |  Related Tickets:
       Test Case:              |
        Blocking:              |
-------------------------------+-------------------------------------------

Comment (by Austin Seipp <aseipp@?>):

 In [changeset:"ff8200afda9b7ada28e1199a109b6b5acf8c30d6/base"]:
 {{{
 #!CommitTicketReference repository="base"
 revision="ff8200afda9b7ada28e1199a109b6b5acf8c30d6"
 Fix hangs with -threaded on iOS (#8307)

 Authored-by: Luke Iannini <lukexi at me.com>
 Signed-off-by: Austin Seipp <aseipp at pobox.com>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8307#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler