[Gerald S. Williams] > I submitted another patch to the POSIX threads code. > It is under SourceForge as patch number 533681. > > This tells Python to explicitly use the POSIX semaphore > code for Cygwin. I had inadvertently left a remnant in > my version of thread.c that forced _POSIX_SEMAPHORES to > be defined for Cygwin. > > It turns out _POSIX_SEMAPHORES is only set if __rtems__ > is defined. At the time I didn't know what that meant > but thought it must have been defined since I got the > correct code. I don't understand. If Cygwin requires _rtems_ in order that _POSIX_SEMAPHORES be defined, then either Cygwin has a bug here, or Cygwin *needs* _rtems_ if you want to use real-time gimmicks like semaphores. In either case, I don't think it's Python's place to second-guess the Cygwin team: report it as a bug to Cygwin, or do whatever they recommend to get _rtems_ defined in the Cygwin build.
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