A substantially zero overhead mutual-exclusion apparatus and method (90, 120) is provided that allows concurrent reading and updating data while maintaining data coherency. That is, a data reading process executes the same sequence of instructions that would be executed if the data were never...http://www.google.com.tw/patents/US5727209?utm_source=gb-gplus-share專利 US5727209 - Apparatus and method for achieving reduced overhead mutual-exclusion and maintaining coherency in a multiprocessor system utilizing execution history and thread monitoring 
