Martin v. Löwis wrote: > You still didn't say what you would suggest to make it thread-safe > again; most likely, you proposal would be to add locking. If I > understand Joe's approach correctly, he has a solution that does > not involve locking (although I don't understand how it works). > Sun had applied for a patent on it. You can go to the uspto search page here http://www.uspto.gov/patft/index.html and look for
20060218561 Code preparation technique employing lock-free pointer operations 20060037026 Lightweight reference counting using single-target synchronization Click on the images link on the patent application where the illustrations are which show the concepts probably better than the text. The first one above is actually a continuation patent on three different techniques. One using double wide compare and swap, one using ROP (Repeat Offender Problem), a form of PDR, and one using DCAS (compare and swap of two separate locations) which only exists on MC68020 and MC68030 processors. -- Joe Seigh When you get lemons, you make lemonade. When you get hardware, you make software. -- http://mail.python.org/mailman/listinfo/python-list
