RTEMS | cpukit/libio: Fix race condition in iop free (!1048)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on cpukit/libcsupport/src/libio.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1048#note_142005

 >  void rtems_libio_free_iop( rtems_libio_t *iop )
 >  {
 >    size_t zero;
 > +  unsigned int flags;
 >  
 > +  flags = rtems_libio_iop_flags_set( iop, LIBIO_FLAGS_FREE );
 > +  if ( (flags & LIBIO_FLAGS_FREE ) == 0 ) {
 >      rtems_libio_lock();

How is check and then lock not a data race?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1048#note_142005
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