RTEMS | draft: Add POSIX msgq priority bucket + bitmap implementation (!1164)

Sun Apr 19 08:20:49 UTC 2026

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.

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