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Default mutex type is PTHREAD_MUTEX_NORMAL. Attempting to unlock an unowned mutex of that type is specified as undefined behaviour, not returning EPERM. mutex7e verfies that attempting to unlock an unowned mutex of type PTHREAD_MUTEX_ERRORCHECK returns EPERM.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin