App runs 8x slower on dual core machine (with test case to replicate issue)

[Zach Saw]

Unfortunately, I'm not paid to minimize test cases for Cygwin.
It already took me quite some time to create the test case to
demonstrate a multicore issue in Cygwin.
And Boost 1.48.0 that I used is officially released as part of Cygwin
(i.e. Cygwin patched - which is different from official Boost).
Another finding - When under WOW64 (Win7-64-bit), the test case fails
(i.e. runs slow) regardless of CPU affinity.
I already found that I could set CPU affinity to fix the issue, so I'm good.

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