patch applied (ghc-6.10/ghc): Close the races between throwTo and thread completion

[Ian Lynagh]

Wed Jan  7 06:05:07 PST 2009  Simon Marlow <marlowsd at gmail.com>
  * Close the races between throwTo and thread completion
  Any threads we missed were being caught by the GC (possibly the idle
  GC if the system was otherwise inactive), but that's not ideal.  The
  fix (from Bertram Felgenhauer) is to use lockTSO to synchronise,
  imposing an unconditional lockTSO on thread exit.  I couldn't measure
  any performance overhead from doing this, so it seems reasonable.

    M ./rts/RaiseAsync.c -6 +13
    M ./rts/Schedule.c -5 +7

View patch online:
http://darcs.haskell.org/ghc-6.10/ghc/_darcs/patches/20090107140507-12142-9083ca672e8bb6f59d85a92e2eca3a90c0a14ee2.gz