Avoid collisions between parallel installations of Cygwin

[Dave Korn]

Brian Ford wrote:

> 1.7.x  deadlock with multiple threads accessing one socket (my fault, I
> haven't notified or provided a test case yet 

  Please do, and CC me when you do.  I'm always interested in anything
thread-related, particularly deadlocks and race conditions.

    cheers,
      DaveK