cvs commit: fptools/ghc/rts Schedule.c

[wolfgang]

wolfgang    2002/12/10 05:38:42 PST

  Modified files:
    ghc/rts              Schedule.c 
  Log:
  Fix a race condition/possible deadlock in the threaded rts:
  
  If a callback into haskell finished before waitThread_() was called,
  the signal was lost  ans waitThread_() waited indefinitely.
  
  Solution: Don't release the sched_mutex between calls to scheduleThread_
  and waitThread_.
  
  Please note that the scheduler API function waitThread is still possibly
  affected by this race condition. It's used in rts_mainEvalIO (I think that's
  safe) and in finishAllThreads (this looks dangerous, but finishAllThreads is
  never used).
  
  Revision  Changes    Path
  1.158     +10 -12    fptools/ghc/rts/Schedule.c
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