RTEMS | testsuites/sptests: Add spcan02 POSIX functional test for virtual CAN bus (!1113)

[MITHILESH MATTAPALLI (@mithileshm)]

MITHILESH MATTAPALLI commented on a discussion on testsuites/sptests/spcan02/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1113#note_145321

 > +  );
 > +  rtems_test_assert( rv == RTEMS_SUCCESSFUL );
 > +
 > +  rv = rtems_task_start( can1_tx_id, can_sender, (rtems_task_argument) can1 );
 > +  rtems_test_assert( rv == RTEMS_SUCCESSFUL );
 > +
 > +  while (
 > +    ( atomic_load( &can1->active_tasks ) > 0 ||
 > +      atomic_load( &can2->active_tasks ) > 0 ) &&
 > +    timeout_ms > 0
 > +  ) {
 > +    rtems_task_wake_after( RTEMS_MILLISECONDS_TO_TICKS( 10 ) );
 > +    timeout_ms -= 10;
 > +  }
 > +
 > +  rtems_test_assert( timeout_ms > 0 );

Fixed it by using `rtems_barrier_wait` with a defined timeout tick that eliminates this race condition

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1113#note_145321
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