RTEMS | cpukit/close.c: Open flag corrected for busy closes (!795)

[Sebastian Huber (@sebhub)]

Sebastian Huber started a new discussion on cpukit/libcsupport/src/close.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/795#note_135122

 >    }
 >  
 >    LIBIO_GET_IOP( fd, iop );
 > -  flags = rtems_libio_iop_flags( iop );
 >  
 >    while ( true ) {
 > +    unsigned int   flags;
 >      unsigned int desired;
 >      bool         success;
 > +    flags = rtems_libio_iop_flags( iop );

Reading the flags in every loop begin is unnecessary, since _Atomic_Compare_exchange_uint() returns the current flags.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/795#note_135122
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