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Unify the status codes of the Classic and POSIX API to use the new enum
Status_Control. This eliminates the Thread_Control::Wait::timeout_code
field and the timeout parameter of _Thread_queue_Enqueue_critical() and
_MPCI_Send_request_packet(). It gets rid of the status code translation
tables and instead uses simple bit operations to get the status for a
particular API. This enables translation of status code constants at
compile time. Add _Thread_Wait_get_status() to avoid direct access of
thread internal data structures.
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Use a red-black tree instead of delta chains.
Close #2344.
Update #2554.
Update #2555.
Close #2606.
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We must ensure that the Thread_Control::Wait information update is
visible to the target thread before we update its wait flags, otherwise
we may return out of date events or a wrong status.
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This enables external libraries to use thread locks since they are
independent of the actual RTEMS build configuration, e.g. profiling
enabled or disabled.
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Use thread wait flags for synchronization. The enqueue operation is now
part of the initial critical section. This is the key change and
enables fine grained locking on SMP for objects using a thread queue
like semaphores and message queues.
Update #2273.
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Move thread queue discipline specific operations into
Thread_queue_Operations. Use a separate node in the thread control
block for the thread queue to make it independent of the scheduler data
structures.
Update #2273.
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Add a thread wait timeout code. Replace _Event_Timeout() with a general
purpose _Thread_Timeout() watchdog handler.
Update #2273.
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