July 2008 - Darwin-kernel - lists.apple.com

Re: msleep : question and typo
by Rick Macklem 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Thu, 31 Jul 2008, St??phane Sudre wrote: Typo: http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin… "you should with either use wait_queue functions or use" -> with--; Question: Does it: - wake up all the sleeping "threads" at once? or - wake up only one sleeping thread? Normally wakes up all threads sleeping on that event at the time of the wake up call. (A common practice is to put the msleep() in a loop checking for the condition it is sleeping for. ie. Using "while(..) msleep();" instead of "if(...) msleep();". This does result in threads waking up and then going back to sleep, so if you can use separate events easily, that could be more efficient.) Have fun with it, rick ps: I remember spotting the same typo, so that doc is getting read;-) _______________________________________________ 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 Let's say you are in a re-entrant callback and you make a call to msleep(void * channel, ...) on multiple calls with the same channel and you then issue a wakeup(void * channel) call.

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msleep : question and typo
by Stéphane Sudre 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Typo: "you should with either use wait_queue functions or use" -> with--; Question: Does it: - wake up all the sleeping "threads" at once? or - wake up only one sleeping thread? _______________________________________________ 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.… http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin… /apple_ref/doc/uid/TP30000905-CH219-CHDFIGGH Let's say you are in a re-entrant callback and you make a call to msleep(void * channel, ...) on multiple calls with the same channel and you then issue a wakeup(void * channel) call. This email sent to site_archiver(a)lists.apple.com

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Documentation bug (ter): missing instruction
by Stéphane Sudre 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com http://developer.apple.com/DOCUMENTATION/Darwin/Conceptual/KEXTConcept/KEXT… [...] " /tmp/syms/: No such file or directory _______________________________________________ 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.… In the "Creating a Symbol File on the Host Machine" chapter, the first instructions are: "To create a symbol file on the host machine, you must have a copy of the kernel extension on the host machine. The host machine must have the same architecture as the target machine (for example, two Intel machines). You must also have the kernel debug kit that correspondes with the version of Mac OS X installed on the target machine. • Create the symbol file. sudo kextload -n -k /Volumes/KernelDebugKit/mach_kernel -s /tmp/syms/ HelloIOKit.kext Adjust the path to the kernel debug kit and your kernel extension as appropriate. This assumes that the /tmp/syms folder exists by default on Mac OS X. That's not the case: This email sent to site_archiver(a)lists.apple.com

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Documentation bug (bis): another source of confusion
by Stéphane Sudre 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com http://developer.apple.com/DOCUMENTATION/Darwin/Conceptual/KEXTConcept/KEXT… And point 5 is: "Optionally, you can rename the symbol file." So optionally, you can rename something you should not rename. _______________________________________________ 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.… In the "Creating a Symbol File on the Target Machine" chapter, we can read this on point 4: "[...]Do not rename the symbol file if you are debugging with a DWARF symbol file (.dSYM). If you are debugging with a STABS symbol file (.sym), you may rename the file so long as the name still ends with .sym.[...]" This email sent to site_archiver(a)lists.apple.com

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Documentation bug: host vs target vs development
by Stéphane Sudre 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com There's a naming bug IMHO in the documentation at http://developer.apple.com/DOCUMENTATION/Darwin/Conceptual/KEXTConcept/KEXT… This is a source of confusion. _______________________________________________ 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.… The documentation is using "Target machine" and "Development machine" in almost all the document. But in the "Create a Symbol File" chapter, it's using "Host machine". Which one is supposed to be the host: the target or the development machine? It's even more confusing to Frenchies as a host in French can be the person who receives or is received. This email sent to site_archiver(a)lists.apple.com

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Re: inode for a given vnode or filepath.
by Maxim Zhuravlev 31 Jul '08

31 Jul '08

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=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=TC2lSNgBGX5BVMBqi2KVtryUETyEhoajt47TMKDauFE=; b=EmOjBUXGqxLVTlPqwKd6leHwgO9WfRyd66ddz2AC8LymsDnJx29AEhgCJaNOq8Whtj AYBRS8xbBoihsM4cOV/0VgKMOKcLkkjvHat82JnVPhYlpfuUEVJb5Fp/QclHZTWKSEYp ZhEIIe26RR8F2HySoOULlnKX3t1irc+iC7ofs= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=jH0tMz9w+NzASQSM1adDZqJz+W0uuYI300JqBLVwvTCy3GaB6YDn3HAqSgUoBiI3EH SK1zNbokkgSMIInAIjk+lvcOa6XIKH4I8kzgDuc+nQq2pCFL6mXftOoJvmO0mECzKi76 2H0NiBKSiWUDx+AaAqw8336zAvfV5lvvysDnY= Unfortunately, it doesn't seem to be supported by any kpi. Cheers, - Maxim. 2008/7/31 Lutz Helwing <lutzh(a)autonomy.com>: > To get the inode number from a path you can simply use stat(). The inode is > stored in st_inode within the stat structure. > Cheers, > lutz _______________________________________________ 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: inode for a given vnode or filepath.
by Lutz Helwing 31 Jul '08

31 Jul '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.16 (Macintosh/20080707) -----Original Message----- From: "Maxim Zhuravlev" <maxim.zhuravlev(a)gmail.com> To: darwin-kernel(a)lists.apple.com Date: Thu, 31 Jul 2008 15:23:51 +0400 Subject: inode for a given vnode or filepath. Hi, all. I would like to find out, how can I get an inode number for a given vnode or filename. For a vnode I can use vnode_getattr(), but it requires vfs context as one of it's parameters. I can get the context by using vfs_context_current(), but it seems to be in com.apple.kpi.unsupported. Are there any other *supported* ways to get inode number (va_fileid in vnode_attr structure) and device id (va_fsid in vnode_attr structure)? And at last, does inode number and/or device id change over time and, if they do, under what circumstances? Thanks in advance, - Maxim. _______________________________________________ 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/lutzh%40autonomy.com This email sent to lutzh(a)autonomy.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.… This email sent to site_archiver(a)lists.apple.com To get the inode number from a path you can simply use stat(). The inode is stored in st_inode within the stat structure. Cheers, lutz smime.p7s

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inode for a given vnode or filepath.
by Maxim Zhuravlev 31 Jul '08

31 Jul '08

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=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type:content-transfer-encoding :content-disposition; bh=X9dqwcmHoYE6tzC0nPHGN9lGEyFuRyDFKMKWGfnfvDM=; b=MJMovEJ1Zd9kHWWvGw+M9jll2wd2oR6T0jBRlsw2z+C2SIJPiGmqLrND5zuqbMe200 sK+kDgUB9wojCR+Ag/l2CvabNQl/0ebGULmysfIxfDN+YONwm0fOdsPiKSF7Z7Gqb831 T0wZ5P7Yega/qa9BspNMSpfR9rts0uJw77oyw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=EZiblcQy4+r2HcMWizvK8sI8IEcmSWYoNFfsL02Zwn3DqP8i1/rAvm0qtTJOqWfayl jXOtSAg7JYtJUED5wLh5/ZT9YGIUvsly8ldt9g9OI/3KxJxpfcNtQovwWw/9SNq1SiWI Xj4u9wiZ6MHsPee00EvhtcU+cRr3XcAV+ZxZk= Hi, all. I would like to find out, how can I get an inode number for a given vnode or filename. For a vnode I can use vnode_getattr(), but it requires vfs context as one of it's parameters. I can get the context by using vfs_context_current(), but it seems to be in com.apple.kpi.unsupported. Are there any other *supported* ways to get inode number (va_fileid in vnode_attr structure) and device id (va_fsid in vnode_attr structure)? And at last, does inode number and/or device id change over time and, if they do, under what circumstances? Thanks in advance, - Maxim. _______________________________________________ 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: Real time question
by Andrea Di Pasquale 24 Jul '08

24 Jul '08

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=domainkey-signature:received:received:in-reply-to:references :mime-version:content-type:message-id:cc:content-transfer-encoding :from:subject:date:to:x-mailer; bh=j23r8MX+yIPE3iIi4WomHiIZ076dzhO9rhhUsaNtlW4=; b=iBabtqbFgGfCkThj60Na71v9OwjL1k8Kw2gEx5h6qbNPUUoBoDKgQlbL6BcOA/BDIF GkKti5l4eFUvBqE1HmTiy1URrcmEu3UR22bvVvQHMxPso/zktsrPAsXazysKZ4iiMG1i KKoSKwwi3BLhASRhJ8Xf/+m8JfTR2k29HnJRs= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=in-reply-to:references:mime-version:content-type:message-id:cc :content-transfer-encoding:from:subject:date:to:x-mailer; b=OYmV9EmvN7xQd/uzy330dd1vtYGFVE0mKQlYr3BeoLvuHa8+HZT8E49Oiw0r62YaZv MrT+24J0rUmGxyRQG3v1dSR5hOAX+XQFOo0T2MMgosUR5Hc19tKj9IXS9y8UyPT4Swmc 5pR1bktLXyIpbgSYYJV2PrN9/yPOLfPi5asLE= Hi, Ti saluto, hahaha yes :) Thank you very mush cheers! Now i'm studing OS concepts and theory, see you later, thank you Ciao guys :) Andrea Il giorno 24/lug/08, alle ore 22:21, mm w ha scritto: HI Andrea, ti saluto, I m going to give some keywords/ concept-keys, if you planned to learn real-time "meccanysms" you need to understand these above concepts: (networking layer further) - real-time scheduling - kernel latencies - kernel preemption - RR scheduling - mutexes / locks / funnels Cheers! On Thu, Jul 24, 2008 at 12:23 PM, Andrea Di Pasquale <spikey.it(a)gmail.com> wrote: Hi! Sorry, i'm not native english language. I'm Andrea, i'm student in secondary high school in Catania, Italy. I want to study real time and networking meccanysm in xnu kernel. Quinn wrote: --- "Real time" means lots of different things to lots of different people. I would not consider Mac OS X to be a real time operating system. However, that does not prevent it from solving numerous real time problems (for example, movie playback). If you can explain what you mean by "real time", we should be able to point you in the right direction. --- So, does networking works with real time meccanysm? Best regards, Andrea This email sent to openspecies(a)gmail.com -- -mmw _______________________________________________ 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.… _______________________________________________ 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/openspecies% 40gmail.com This email sent to site_archiver(a)lists.apple.com

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Re: Real time question
by mm w 24 Jul '08

24 Jul '08

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=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=Ann6XkdGSHWMIiKrKfFXGBE+NDdvHEZzNUAJKrmsSdE=; b=Sxk9YB7QrZRDzC0GSwCIiNeM96esrZ+/+UmNIf6URCOSgZeyi+BmYjf8pLvEVGyk4m kO1EXXsU2sIORKjnDCRIALlNq5836rBsqsdrafGSgq3kqCvsaH6VXIBd3g3c4qO1gjkj yrqft987GGg8piDGwrDkt9CZxmmVTmFtqlwbY= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=VxILasf0pQ8bG5fU1dRKFDvowSAB6BwV/DDHD1NLElVkHOgJEJKxcEgrGWMR+csoYt 13prop7xA/1WwUA3TqNswbSJH7GMsFU+mmr/+wPzRLemQ4bQ+MJKwZGzZmb6M0/+Nt8f 6P0rCdvxPdFw8ea5A9CwgOwmmyE6mC9tBH2rs= HI Andrea, ti saluto, I m going to give some keywords/ concept-keys, if you planned to learn real-time "meccanysms" you need to understand these above concepts: (networking layer further) - real-time scheduling - kernel latencies - kernel preemption - RR scheduling - mutexes / locks / funnels Cheers! On Thu, Jul 24, 2008 at 12:23 PM, Andrea Di Pasquale <spikey.it(a)gmail.com> wrote: > Hi! > Sorry, i'm not native english language. > I'm Andrea, i'm student in secondary high school in Catania, Italy. > I want to study real time and networking meccanysm in xnu kernel. > > Quinn wrote: > --- > "Real time" means lots of different things to lots of different > people. I would not consider Mac OS X to be a real time operating > system. However, that does not prevent it from solving numerous real > time problems (for example, movie playback). > > If you can explain what you mean by "real time", we should be able to > point you in the right direction. > --- > > So, does networking works with real time meccanysm? > > Best regards, > Andrea > > > _______________________________________________ > 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/openspecies%40gmail.com > > This email sent to openspecies(a)gmail.com > -- -mmw _______________________________________________ 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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