RTEMS | POSIX Message Queue thread release order is not priority based (#3791)

[Xinhong Hu (@aptacc2421)]

Xinhong Hu commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/3791#note_143490


Hi @gedare @joel,

Following the earlier discussion, I have opened a draft MR (!1084) implementing a per-instance `mq_ispriority` field for POSIX message queues. 

**Current scope:**

- Introduce an RTEMS-specific `mq_ispriority` field in `struct mq_attr`
- Preserve FIFO as the default behavior for backward compatibility
- Select the underlying core discipline in `mq_open()` based on this field
- No global configuration mechanism yet This draft focuses only on validating the per-instance approach.

**I would appreciate feedback on:**

1. Whether this direction aligns with the intended resolution of [#3791](https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/3791)
2. Any concerns regarding structure layout or API impact
3. Whether a `confdefs.h` default mechanism should be added next

Thank you for your guidance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/3791#note_143490
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