August 2011 - Darwin-kernel

Re: How can I get notified that a kernel thread has been terminated ?
by Ken Hornstein 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com >> I don't believe there is a generic mechanism. Normally people in this >> situation use one of the standard synchronization mechanisms to wait >> for the thread to exit before finishing the unload of the kext > >I have tried that. The kext-unload waits for a flag to be set (this is the >last thing my thread function does) before carrying on with the unload. >Still it is not enough. Hrm. The stuff I'm doing has a number of worker threads and they all do that, and it works fine. It feels to me like something else is going wrong here. And considering that this is pretty common ... I have to think that there's some other problem you're running into at kext unload time. >I suppose my question really is : >- when the function of the worker thread (i.e. the one passed as first >argument to kernel_thread_create) returns, does that really mean that the >thread terminates at that point ? I imagine there must be some kind of >low-level operations to be done to actually terminate the thread. >My point is: could it be that my worker thread function returns notifying my >other thread by setting this flag, the scheduler then switches back to my >kext-unload function but the actual thread gets really terminated at some >later stage... after my kext has been unloaded ? I can see what you mean about the scheduler switching back to the kext worker thread, but like I said if this was a problem then a LOT of people would be running into it. I don't know what other cleanup is required after a worker thread function exits, but I don't think it's a lot. Anyway, debugging it with gdb should tell you for sure. (Also, it occurs to me that even after a kext is unloaded a worker thread running out of that kext MIGHT ... and that's a big MIGHT ... still run okay for a little while until that bit of memory has been reused. But that's just a guess and could easily be wrong). --Ken _______________________________________________ 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: How can I get notified that a kernel thread has been terminated ?
by Nicolas Connoud 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=GLe3ZGijomQxe0GOCs6YxKNEo7/sbtZvVVGFeSbEpg8=; b=x8r02nJMcYxPTvwLTXH2SPJpE9GmEQrmcwcd8WZM7Z41KZJB2k6eBvem59VbJcUsm7 1NjXnmJI51Tyqh+5sNAbY8YhNw5y1uXjV5kTsloCtTcQZbwhHm4hY1wrsxWT9jB0XCwm FR+8qNQ25a6ZCOBbaLh2TNrM/CbGSn8tfpLoY= _______________________________________________ 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: Matching KEXT build versions to kernel build versions
by David Lee 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcxTITzAaFxAe+AGQ7q9NGxHO3vpcQADGuhw Thread-topic: Matching KEXT build versions to kernel build versions _______________________________________________ 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: Matching KEXT build versions to kernel build versions
by Ken Hornstein 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com >I need to get source code for some of the KEXTs that go along with 10.6.7. >When I execute "kextstat" against a 10.6.7 kernel I get (for example): > >14 21 0x908000 0x11000 0x10000 com.apple.iokit.IOPCIFamily (2.6) <7 5 4 3> > >This seems to suggest that what I want is source for IOPCIFamily version 2.6. >But when I look at http://www.opensource.apple.com/source/ (or >http://www.opensource.apple.com/tarballs/) I see options like >IOPCIFamily-144/. There seems to be two different numbering systems in use. What I personally do is go to the web page that has all of the sources for a particular OS version. If you start at the root of that web page (http://www.opensource.apple.com) and select the 10.6.7 release, you will find that the version of IOPCIFamily you want is 115. If you're curious about the version numbered "2.6", you can check that in Info.plist file in the package (I guess in this case, it is named "Info-IOPCIFamily.plist"). In that version the CFBundleShortVersionString is 2.6.1 (Huh, I'm surprised that it shows up just as 2.6 for you; on my copy of 10.6.8 it shows 2.6.5). --Ken _______________________________________________ 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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Matching KEXT build versions to kernel build versions
by David Lee 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcxTHze3DrKPNwhdQUyCECwD1YL1qA== Thread-topic: Matching KEXT build versions to kernel build versions _______________________________________________ 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: Deadlock in open() syscall
by Anatol Pomozov 04 Aug '11

04 Aug '11

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Re: How can I get notified that a kernel thread has been terminated ?
by Ken Hornstein 04 Aug '11

04 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com >My question is : > - How can I get notified when the thread has terminated? Is it at all >possible? I don't believe there is a generic mechanism. Normally people in this situation use one of the standard synchronization mechanisms to wait for the thread to exit before finishing the unload of the kext (also - have you tried debugging your kernel panic with gdb? That should at least give you a better idea what is going on). So you'd have your worker thread tell the kext-unload thread that it's finished as the last thing it does. > - I have read about thread_terminate() but it looks like this function in >not available for kexts (KERNEL_PRIVATE only) I see thread_terminate() is exported in the 6.0 version of com.apple.kernel.libkern, at least on Snow Leopard. Not sure if you can depend on it being around in Lion. --Ken _______________________________________________ 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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How can I get notified that a kernel thread has been terminated ?
by Nicolas Connoud 04 Aug '11

04 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; bh=9plhS7Eo/Y7h/ZWdEQK54cjqzEsWVb47KPXtdKh+l+o=; b=UsIm+hVB6uq+fSz70xISS6VDqh0HtAyo2GFDttpixRM5+rlPW1uAvh+ZJYgNK42fex fg80hcVNY+43q1bNSwpH0ZWO8+rgM3i6kKuwY0ffLs3E1pYRdsMqnTcvBuHXKxqHsEJi N7si5fgvAxS/smMVQC8NgU4SqyKrRI+jebX20= _______________________________________________ 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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sendto/read sys call behavior
by Sam Pullara 03 Aug '11

03 Aug '11

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Re: Managing hardware priorities (IRQLs)
by Michael Smith 03 Aug '11

03 Aug '11

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