Long description
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enter underscore region colon
TSL REGISTER coma LOCK vertical line copy lock to register and set lock to 1
CMP REGISTER coma hash 0 vertical line was lock zero question mark
JNE enter underscore region vertical line if it was not zero coma lock was set coma so loop
RET vertical line return to caller semicolon critical region entered
leave underscore region colon
MOVE LOCK coma hash 0 vertical line store a 0 in lock
RET vertical line return to caller
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