Mon Aug 24 11:22:52 PDT 2009 Thomas Schilling <nomin...@googlemail.com>
* Make FastString thread-safe.
This is needed both for per-session parallelism and for allowing
multiple concurrent sessions in the same process. With the help of
atomicModifyIORef and unsafePerformIO it is also quite fast--an MVar
would most likely be slower. On a full compilation of Cabal's head
branch it was about 1-2 percent slower, but then overall compilation
times varied by about 4 percent, so I think it's worth it.
M ./compiler/utils/FastString.lhs -84 +45
View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090824182252-7c5c6-bd75e02998a389cc91f23d5b9c6d8ed8d5e60926.gz
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