patch applied (ghc): When waking up thread blocked on TVars, wake oldest first (#2319)

Fri Oct 10 11:06:03 EDT 2008

Fri Oct 10 08:03:22 PDT 2008  Josef Svenningsson <josef.svenningsson at gmail.com>
  * When waking up thread blocked on TVars, wake oldest first (#2319)
  StgTVarWatchQueue contains the threads blocked on a TVar in order 
  youngest first. The list has to be traversed backwards to unpark the threads 
  oldest first.

  This improves the fairness when using STM in some situations.

    M ./rts/STM.c -2 +10

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20081010150322-f316c-a06f3083199bb9a657466a539e4a0aca833e5761.gz