* lib/select.c: Make select() multi-thread safe in windows

[Akash Rawal]

Hi,

I modified lib/select.c to fix misbehaving select() on windows
when select() is simultaneously called from multiple threads.

- I used a stack to reuse events created by CreateEvent()
  in similar way to the original code. I have no idea
  why event handle was reused in original code, so I
  preserved this behavior.

- There is an obvious issue that my fix depends on pthread
  which is probably unacceptable but I have no idea how to
  use pthread only when pthread is actually used.

By the way the problem I fixed was that when multiple
threads call select() simultaneously, select() invocation
with the fd that received an event often remains blocked and
some other select() invocation returns.

Please let me know what you think of this patch.

Regards,
Akash Rawal

0001-lib-select.c-Make-select-multi-thread-safe-in-window.patch
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