[GHC] #7719: System.Timeout.timeout may leak <<timeout>> exceptions

[GHC]

#7719: System.Timeout.timeout may leak <<timeout>> exceptions
-------------------------+--------------------------------------------------
Reporter:  int-e         |          Owner:                
    Type:  bug           |         Status:  new           
Priority:  normal        |      Component:  libraries/base
 Version:  7.7           |       Keywords:                
      Os:  Linux         |   Architecture:  x86_64 (amd64)
 Failure:  None/Unknown  |      Blockedby:                
Blocking:                |        Related:                
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Comment(by int-e):

 So I have some numbers using Bas van Dijk's benchmarks (negative speedups
 are slowdowns):
 {{{
 Benchmark            speedup (%)
                     NT   T1 T2 T3     NT = non-threaded
 willTimeout         -5   34  0 -1     T1 = threaded, -N1
 wontTimeout        -16   68 82 82     T2 = threaded, -N2
 busyWillTimeout      6   98 94 95     T3 = threaded, -N3
 busyWontTimeout     -7   68 79 76
 externalException    0    2  4  1     (Athlon II X3 445,
 nestedTimeouts            0  0  0     x86-64 Linux)
 }}}
 I'll attach the benchmark code but beware that compiling criterion on
 ghc's head currently requires patching 7 packages, mostly for the
 {{{Typeable}}} changes.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7719#comment:8>
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