Chandan U commented: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1164#note_148762


The recent patch adds POSIX-only structure for a RB-tree based path for pending 
messages. It does not change any existing CORE message queue behavior 
maintaining the decoupling architecture as suggested earlier.

It introduces an embedded RB-tree node and a per-message sequence number inside 
`CORE_message_queue_Buffer`, and adds an RB tree control structure plus a 
sequence counter in `POSIX_Message_queue_Control`, which are only used when 
POSIX is enabled.

During queue creation, the RB-tree is initialized as empty and the sequence 
counter is reset to 0.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1164#note_148762
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