[MLton] cvs commit: critical sections during thread switch

[Matthew Fluet]

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Here's a revised gc.c.  It seems to pass the regressions (with the slow
GC_switchToThread), but I don't want to check it in without someone else
taking a look at it.

Essentially, here's what changed:

  switchToThread(GC_state s, GC_thread t)
     - never invokes a GC, it just modifies s->currentThread;
       it's up to the caller to (indirectly) invoke doGC.

  I moved the send of a GC signal to doGC, which seems where it really
  belongs.

  mutatorFrontierInvariant, mutatorStackInvariant, and
  ensureMutatorInvariant work together to check that enough frontier and
  stack are available for the current thread, possibly invoking a GC if
  necessary.

My big question is whether or not the stack resizing in forward is correct
given the new invariants.


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