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<a href="https://gitlab.rtems.org/Chandanuvm">Chandan U</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1164#note_148264">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">In the recent commit, I followed the suggested design and changed POSIX Message queue to support two compile-time layouts,</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">CORE_message_queue_Control (normal)</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">CORE_priority_message_queue_Control (optimized)</li>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I used a typedef alias and one common struct field, <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">POSIX_message_queue_Core_control Message_queue</code></p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">This avoids duplicate struct members and allows compile-time selection. In the optimized layout, the base CORE queue is in <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">Message_queue.Base</code></p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial"><strong style="font-weight: 600; margin-top: 0;">Next step:</strong> update POSIX source files that still directly use <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">the_mq->Message_queue</code> to use <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">_POSIX_Message_queue_Get_core_queue( the_mq )</code> so both layouts work correctly.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I scanned with: <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">rg -n "the_mq->Message_queue" cpukit/posix/src cpukit/include/rtems/posix</code> and identified the POSIX source locations to update.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Also, special cases are handled separately:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">THREAD_QUEUE_OBJECT_ASSERT()</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">RTEMS_CONTAINER_OF( )</li>
</ul>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">which reference the <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">Message_queue</code> member path.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Am I in the right direction?</p>
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