Rewrite of task switching mechanism#485

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eholk wants to merge 1 commit intorust-lang:masterfrom

Commits on Jun 14, 2011

This is the mega-ucontext commit. It replaces the task switching mechanism with a new one inspired by ucontext. It works under Linux, OS X and Windows, and is Valgrind clean on Linux and OS X (prov…
Eric Holk
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