A module which has been called from a … called it. This can cause great confusion in … Another technique is to prohibit … any recursive downcall. This technique, while apparently rather … upcalls into the client above to ask simple … Another technique … is for the downcall to perform the requested … holding the lock [of a task in an upcall], if it should find … [p.178] [A somewhat similar technique] is to restrict the semantics of … which are examined at known times by other …
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