syg/iontrail — pull request #4 by pnkfelix (2013-01-23 21:09:16+00:00)
Title: Stop-the-World Garbage Collection for ParallelDo.

This includes the following changes:

* Add StackExtents abstraction, allocate one for each thread

* Threads maintain their own StackExtent (must be valid before yielding to GC)

* The GC walks through the list of StackExtents and walks each one via
the same stack scanning code.

* Added mandelbrot benchmark more like one from Rivertrail demo.

Also added the following drive-by changes:

* The ForkJoinShared object has a vector of ForkJoinSlice*; each
slice inserts/removes self in its constructor/destructor.

* Augmented test call-to-method-mut.js with checks of return value
from p.map call that is supposedly disqualified to ensure e.getA
mutation is still happening.