Ramchandra Apte added the comment: afaik they don't seem to be grammatical errors "subsequent attempts to acquire it block" - block is the verb, don't see anything wrong similar example: the crowd blocks me. (present tense) "which one of the waiting threads proceeds is not defined, and may vary across implementations." - there is only one clause, so no comma needed. If two separate clauses. are separated a coordinating conjunction (such as and), commas are required afaik.
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