October 2006 - Darwin-kernel

Re: thread_t, uthread_t, at al.?
by plumber Idraulico 27 Oct '06

27 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 27, 2006, at 1:50 AM, Rick Mann wrote: Hi, Mike this approach exists on other nix* like Linux , Solaris .... Cheers -plum _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Can someone explain to me what thread_t is? I'm having a heckuva time locating its definition. There's a method in the XNU sources current_thread(), which returns a thread_t. You can call get_bsdthread_info() to get a uthread_t. But I'd like to know more about these threads. Is there documentation somewhere? In particular, how can I get the process ID owning a particular thread_t? The source is the documentation for this sort of thing, and being an implementation detail it's not something that you should expect to stay nailed down. Colloquially speaking, the thread_t is the mach thread handle, and the uthread is the BSD-side thread information (historically, the U area was part of the process' address space holding certain process- specific information). I don't believe that there is KPI to easily do what you're asking. Why do you want to know the PID associated with an arbitrary thread? Is it not something you can obtain while you are being run on that thread? = Mike This email sent to site_archiver(a)lists.apple.com

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seeking overview of scheduling on dual-core (or more)
by Sean W. Smith 27 Oct '06

27 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Howdy! Can anyone point me in the right direction? Thanks, Sean Sean W. Smith sws(a)cs.dartmouth.edu www.cs.dartmouth.edu/~sws/ Department of Computer Science, Dartmouth College, Hanover NH USA _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I'm teaching an OS course. Now that Mac Minis are coming with dual- core Intel CPUs by default, some students are asking how OSX handles scheduling for multi-CPU platforms. Poking around, I wasn't able to find an answer. This email sent to site_archiver(a)lists.apple.com

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Re: thread_t, uthread_t, at al.?
by Michael Smith 27 Oct '06

27 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 27, 2006, at 1:50 AM, Rick Mann wrote: = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Can someone explain to me what thread_t is? I'm having a heckuva time locating its definition. There's a method in the XNU sources current_thread(), which returns a thread_t. You can call get_bsdthread_info() to get a uthread_t. But I'd like to know more about these threads. Is there documentation somewhere? In particular, how can I get the process ID owning a particular thread_t? The source is the documentation for this sort of thing, and being an implementation detail it's not something that you should expect to stay nailed down. Colloquially speaking, the thread_t is the mach thread handle, and the uthread is the BSD-side thread information (historically, the U area was part of the process' address space holding certain process- specific information). I don't believe that there is KPI to easily do what you're asking. Why do you want to know the PID associated with an arbitrary thread? Is it not something you can obtain while you are being run on that thread? This email sent to site_archiver(a)lists.apple.com

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Re: thread_t, uthread_t, at al.?
by plumber Idraulico 27 Oct '06

27 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Kernel thread #include <kern/thread.h> #include <kern/thread_act.h> #include <kern/thread_swap.h> #include <mach/thread_status.h> Thanks! -- Rick see osfmk src for examples Cheers -plum _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Can someone explain to me what thread_t is? I'm having a heckuva time locating its definition. There's a method in the XNU sources current_thread(), which returns a thread_t. You can call get_bsdthread_info() to get a uthread_t. But I'd like to know more about these threads. Is there documentation somewhere? In particular, how can I get the process ID owning a particular thread_t? http://developer.apple.com/documentation/Darwin/Conceptual/ KernelProgramming/scheduler/chapter_8_section_5.html This email sent to site_archiver(a)lists.apple.com

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thread_t, uthread_t, at al.?
by Rick Mann 27 Oct '06

27 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thanks! -- Rick _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Can someone explain to me what thread_t is? I'm having a heckuva time locating its definition. There's a method in the XNU sources current_thread(), which returns a thread_t. You can call get_bsdthread_info() to get a uthread_t. But I'd like to know more about these threads. Is there documentation somewhere? In particular, how can I get the process ID owning a particular thread_t? This email sent to site_archiver(a)lists.apple.com

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Re: XNU Darwin 8.8 Source ?
by Terry Lambert 25 Oct '06

25 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 25, 2006, at 1:06 AM, Chris Burnley wrote: For questions like this, you need to contact DTS at: <http://developer.apple.com/technicalsupport/> If you don't have an ADC membership, then you can watch this web page: <http://www.opensource.apple.com/darwinsource/> -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… When will it be available for PPC? Apple employees aren't going to answer forward looking questions on this list because they are not authorized to do so. for updates; AFAIK, there isn't an RSS feed for this page, but you could always file a request that one be added. This email sent to site_archiver(a)lists.apple.com

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XNU Darwin 8.8 Source ?
by Chris Burnley 25 Oct '06

25 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:mime-version:content-type; b=t3R3M8umTEOksJ3FAeUCdD0l1LbqlSJRNS9v6nrzuaR9Fh85/Uel05spy6LqaPDJAU0i8lPIjmV0nKEE0EDGQyuL56lVhR4CRvYOgm4WECxyi95Jd33kj/dayMJLQpJ/vxIxqlFO2vLfaK/f+kRiyG0QTbNp1WM8zHJtfQLC4W4= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: mbuf corruption tracking advice
by Andrew Gallatin 24 Oct '06

24 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Andrew Gallatin writes: > > Does anybody have any advice about how to track down an > mbuf data corruption panic? FWIW, I finally stopped looking at my receive routine, and found a bug in my transmit routine that explained the problem. I was (rarely) calling mbuf_pullup() and erroneously retaining the original, not the new, mbuf in my transmit data structures. This presumably caused the original mbuf to be freed twice (once a bit later by transmit done interrupt routine, and previously by mbuf_pullup()). Rarely, I'd get a "freeing free mbuf" panic, and more often the frees would happen far enough apart that somebody else had allocated it, and things went downhill fast. Drew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: What, besides open files, can keep a volume busy?
by William Kucharski 24 Oct '06

24 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 23, 2006, at 10:17 PM, jblist(a)mac.com wrote: William Kucharski kucharsk(a)mac.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I've seen that with SMB mounts occasionally and it's driven me nuts. It seems only a reboot clears it. I haven't seen it since 10.4.8, but I don't know that that is relevant. I haven't really tracked it, and it could be that it hasn't happened since an older rev. and I just didn't notice when it stopped. Now for the real fun - another thing that can keep a volume busy is a long write. Basically put, if a long write is done to a volume, but the buffers have not yet been synced to the disk, the system will see the volume as busy but no actual files will be open on the disk. Usually this occurs if a vast quantity of data is being written to the disk amd the writer takes an interrupt, and the interrupt routine closes the files and expects to be able to unmount the volume. Depending on the timing, you may find your unmount failing with an EBUSY for no (apparently) good reason... This email sent to site_archiver(a)lists.apple.com

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Re: What, besides open files, can keep a volume busy?
by jblist＠mac.com 24 Oct '06

24 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 23, 2006, at 9:33 AM, Rick Mann wrote: And looking, I see it on the desktop (it's a bit cluttered). Thanks! -- Rick _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/jblist%40mac.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I've seen that with SMB mounts occasionally and it's driven me nuts. It seems only a reboot clears it. I haven't seen it since 10.4.8, but I don't know that that is relevant. I haven't really tracked it, and it could be that it hasn't happened since an older rev. and I just didn't notice when it stopped. I've got a network drive mounted, and it shows up in the Finder. I tried to unmount it, but the Finder reports that it's busy. I used lsof to see what processes still had it open, and it reported nothing. I even tried running it as root. I ran it like this: Then I checked the mounts, and got these two (the second is a disk image on the network drive, which is usually unmounted automatically by my backup software): //WORKGROUP;RMANN@TSUNAMINAS/TWINAEROBACK on /Volumes/TWINAEROBACK (nodev, nosuid, mounted by rmann) /dev/disk2s2 on /Volumes/TwinAeroSuperDuperBackup (local, nodev, nosuid, journaled) So, I'm puzzled by lsof not reporting anything. Do I misunderstand its use? Am I missing some flags? I'm trying to use lsof in a utility to report processes with open files, and now I'm finding it's unreliable for that. This email sent to jblist(a)mac.com This email sent to site_archiver(a)lists.apple.com

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