Re: Locks
Re: Locks
- Subject: Re: Locks
- From: Scott Ribe <email@hidden>
- Date: Sat, 10 Dec 2011 07:50:00 -0700
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. 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???
--
Scott Ribe
email@hidden
http://www.elevated-dev.com/
(303) 722-0567 voice
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden
| References: | |
| | >Locks (From: koko <email@hidden>) |
| | >Re: Locks (From: Ian Joyner <email@hidden>) |