RTEMS | cpukit/libio: Support close with IOP references held (!516)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on cpukit/libcsupport/src/libio.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/516#note_125068

 >    return iop;
 >  }
 >  
 > -void rtems_libio_free(
 > +void rtems_libio_free_iop(
 >    rtems_libio_t *iop
 >  )
 >  {
 >    size_t zero;
 >  
 > -  rtems_filesystem_location_free( &iop->pathinfo );
 > +  if ( !rtems_libio_iop_is_free( iop ) ) {
 > +    /*
 > +     * Clear the flags. All references should have been dropped. Free
 > +     * IOP have all reference count its set.

That part of the comment is old. I had been testing that approach as a way to avoid adding a free bit but it proved to be to hard to maintain an atomic state. A free bit was added.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/516#note_125068
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