On 11 Dec 2011, at 01:50, Scott Ribe wrote: > On Dec 9, 2011, at 4:48 PM, Ian Joyner wrote: > >> You are probably looking for something like Dahm locks (invented by Dave >> Dahm on the Burroughs B5000 in the 1960s). Here is a long paper on locks >> including this origin: >> >> http://pages.cs.wisc.edu/~remzi/OSFEP/threads-locks.pdf >> >> Here is an idea of the ALGOL define for acquire: >> >> DEFINE >> ACQUIRELOCK (ID) = >> BEGIN >> IF READLOCK (PROCESSID, CONTENDERS[ID]) ^= 0 THEN >> DO >> PROCURE (LOCKS[ID]) >> UNTIL READLOCK (-1, CONTENDERS[ID]) = 0; >> OWNERS [ID] := PROCESSID; >> END # > > I seriously, seriously, seriously doubt that he wants to be implementing > locks by translating Algol, *especially* when key, tricky to get correct, > routines are not provided.
I doubt that as well and that was not my suggestion or intention or I could have posted the whole file and suggested he do that (although that code is very old and apparently not in current implementations). > But then again, based on the Windows code he presented, OP has nothing > against re-implementing these functions poorly ;-) > > OSAtomic functions could replace the Interlocked functions. But seriously, > what's wrong with the available lock functions? Why in the world would you > implement your own locks??? That was the intention to get OS X equivalent and to throw in a bit of background and accreditation to Dave Dahm and other visionaries at Burroughs who truly thought different or we'd still be coding machine language. Ian _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
