Simple M:N task to OS thread support (Issue #508)#566

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eholk wants to merge 7 commits intorust-lang:masterfrom

eholk:threading

Commits on Jun 24, 2011

Added a parallel fibonacci program. It doesn't actually run in parallel yet, but it will give us something fun to test threading with.
Eric Holk
committed
Basic multithreading support. The infinite loops test successfully maxes out the CPU.
Eric Holk
committed
Added an environment variable to control how many threads to use.
Eric Holk
committed
Added some locking to ports to prevent the case where two threads simultaneously wake up a task blocked on a certain port.
Eric Holk
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Fixed a few concurrency bugs. Still not perfect, but overall it seems much more reliable.
Eric Holk
committed
Conservatively serialize nearly all upcalls. Successfuly ran make check with RUST_THREADS=8, so we're probably fairly safe now. In the future we can relax the synchronization to get better performa…
Eric Holk
committed
Implementation mising features in lock_and_signal for Win32. Also lowered the minimum stack size to get the pfib benchmark to run without exhausting its address space on Windows.
Eric Holk
committed