At 4:30 -0800 2/3/04, Ramble Leon wrote: struct page in linux is used very wide, most in I/O operations, such as file read/write from device, sometimes it's also used in network communicatin. At the same time, page is the basic memory unit while using virtual memory. So could you please give me some suggest about that? PS: I'm not working in the xnu, just add a kext, so what I need is the struct can be used in kext. Hmmm, I don't think there is any direct equivalent in Darwin. It really depends on what type of KEXT you're implementing. If you're working in the I/O Kit space, you need to look at IOMemoryDescriptor. If you're working in the BSD or Mach space, you should look at UPLs (Universal Page Lists). It'd really be helpful if you could describe what you're trying to do at a higher level. Is there any facility in mach provide functions like schedule_timeout(time), which means current thread will giveup processor and not be scheduled until time out? I think thread_switch(...) can do this, but seems the thread calling thread_switch(...) cannot be resumed before the time is exhausted. But it's very important for me to resume the thread at sometime before the time is exhausted. Again, this depends on what area of the kernel you're working in. BSD, Mach, and I/O Kit all have support for stuff like this, and they are all different. In general, you want to use the support from the subsystem in which you're operating. S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.