Randomish thoughts: 1. PAUSE/RELEASE is imho, a rather overly complex interface. My current policy is to only use it when both SRB and TCB code have to mingle. Otherwise, WAIT/POST (although you should look at EVENTS), or SUSPEND/RESUME in homogeneous environments. 2. It is a long-standing tradition for IBM's programming examples to be um, primitive. But considering their purpose, using more modern instructions may well confuse those who most need the examples. Once/if someone learns NILH, TMLH then they know what to replace.
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