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However, further investigation reveals that the Linux pthread_atfork() registered functions are not being called and POSIX does not proved a mechanism for un-registering these functions.   Note: pthread_atfork() is not bumping the ref count on the shared lib--those functions are definitely unavailable after the dlclose() In the Cygwin version, calling the functions in the unloaded library when the fork happens causes the crash. This seems to be a bug with fork(), if it is a bug at all. Kevin -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple