Multi Threaded programs deadlock doing simple I/O operations

[Mark Pizzolato]

There is a serious problem for multi threaded programs doing simple I/O 
operations in cygwin (open, dup, fdopen, fclose, and close).

The attached 81 line test program clearly demonstrates the issue (by hanging 
and no longer consuming CPU or performing any I/O operations).

I'm sure that anyone who ever encountered a stange hang in any program 
running under cygwin would appreciate a fix for this issue.

- Mark Pizzolato
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