TCA is created in the task subpool when a task was attached. The storage acquired by a task is chained from TCA SAA with the most recently acquired storage at the front of the chain. The next allocation is found in the SAA. The last area points to the STCA.
TIOA is chained off from TCTTE instead of TCA because there is a chance that the task has gone when its terminal message still waiting to be sent.
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