site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Sam Fore pre-Tiger, yes, thread funnels were basically giant locks. There was one for networking and one for everything else in the BSD kernel. I'm surprised that they are still in Tiger, as that is supposed to be one of the big changes in the Tiger kernel: no more funnels. I can only surmise that they are there for some kind of backward compatibility, but since all NKE and FS kext's have to be updated to the kpi's I don't know who that compatibility would be for. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... The funnels are still there to let file systems that aren't re- entrant continue to behave the way they did pre-Tiger. If you don't set a VFS flag to indicate that you're a re-entrant file system, the VFS/VOP interfaces will take the funnel before calling your file system entry points. Should be a handy middle step when porting a 10.3 file system to 10.4. Once you're up and running, turn on re-entrancy and watch the deadlocks, data corruptions and panics roll in ;-) This email sent to site_archiver@lists.apple.com