June 2011 - Darwin-dev - lists.apple.com

Where to get the kernel debug kit for mac pro 10.6.7 book
by Jiang, Yunhong 20 Jun '11

20 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: Acwu+YBZM+cRrT/KT/aBkIzmal9bWw== Thread-topic: Where to get the kernel debug kit for mac pro 10.6.7 book _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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IOI2CSendRequest performance
by Jeff Schindler 17 Jun '11

17 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:from:content-type:content-transfer-encoding :subject:date:message-id:to:mime-version:x-mailer; bh=q8/vChvn+y5mnSxNchBc3oiKX3QRYVMVfAa/f3ycxHo=; b=JwEO+8Wa3+/jVlTxODnhBZOdBXmmUFeTW91O0vj+aK5gJ0rmMdiNsEMlPA6jLBKuDY NxWIRF89o8vtCGLfGCQJWreo4mlREHlRtRZPvM+HxcNkPsJRQUYp38m8T2IBV0QCljFn KODRZBR1SrCNuOEG0tbxL3VJ4Za7R6qfk3e1M= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; b=pKujNO0HPFyedobkpDuTZn7WyCiy5ahAnELJxC9fPeU6XnPuJtEKcrlRPuaBpwsmls ypNmHDOtrNxmh8p/veFEE7FAzhPZeb4NoYn01Ae4KeRSVAQc24O8JPL3/kFyV1MK4j0P JNfOdoavRZY7zbYYqSD+nQGETH3hGBKulRNNI= Hello, I'm not sure of the appropriate list to post this - I tried Carbon-dev, but got no replies. Any info would be much appreciated. We're using IOI2CSendRequest to periodically poll the state of a VCP table code on a monitor (we're doing this from a HAL plugin that runs inside of iTunes) and are seeing strange performance issues. We're opening/closing the I2C interface each time we poll (which is currently once per second) and eventually will see this polling affect the mouse cursor performance, specifically that its tracking drops out with each call to IOI2CSendRequest so that you get a jumping of the cursor as you move the mouse. This does not happen immediately after the polling starts, but maybe 30 seconds or so afterwards. I tried commenting out the call to IOI2CSendRequest, but leaving in the opening/closing of the I2C interface, but that did not repro the problem, so it's something specific with the call to IOI2CSendRequest. Would it help at all to retain that I2C interface and not open/close it each time? Any ideas why that would be affecting performance like it does? UPDATE: I tried retaining the I2C interface connection, but that did not help, so it's something specific with the IOI2CSendRequest call. Thanks, Jeff _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Problem while loading libraries
by nithesh salian 15 Jun '11

15 Jun '11

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RE: kqueue issue in multithreaded environment
by Leonardo Bernardini 11 Jun '11

11 Jun '11

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Re: kqueue issue in multithreaded environment
by A.M. 10 Jun '11

10 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jun 10, 2011, at 5:31 AM, Leonardo Bernardini wrote: > > To anyone interested, I've solved the issue, It has been very complicated to troubleshoot this, because there's a real lack of documentation on how kqueue should be used in a multi-threaded environment. After struggling and studying the kernel, I've fixed my issue ending with a more concrete knowledge of the topic. What I describe here, applies to a Mac OS X 10.6.7 kernel, I really don't know if this has the same behaviour on other BSD variants and/or other OS X versions.... > > My problem was that, under certain circumnstances, I was registering events on the same file descriptor, from multiple threads simultaneous, this ended with a race condition that, for a funny reason, is shown only when you close the file descriptor, there's no lock actually during the kevent() call. > > So, kqueue listens can be invoked on the same kqueue FD from multiple threads, if you use the ONESHOT flag for the events, you'll get just one message per thread, while if you don't use ONESHOT, you may get the same message on each listening thread. Kevents can be registerd from multiple threads as long as you protect the calls on the same file descriptor, i.e. if you want to register for a WRITE event from a sock, be sure to wrap the kevent call in a mutex or whatever else . Same thing, if you need to react to a EOF condition and/or an error that tells you the socket needs to be closed, lock any kevent() call while you close the socket to again avoid a race condition... Also unless you use the ONESHOT flag, avoid to re-register already registered events because it requires you to provide further syncronizations and it's really useless, I did that because I ported the logic from an epool based linux code, that works in a total different way.. > > Thanks for the support, hope this helps someone else! > > Cheers ! > > Leonardo Bernardini > I use kqueue between multiple threads reading and writing one socket, never lock around kqueue or use ONESHOT and I haven't seen this deadlock. Do you have reproducible test case? The only time I lock is to for the userspace socket buffering. Cheers, M _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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RE: kqueue issue in multithreaded environment
by Leonardo Bernardini 10 Jun '11

10 Jun '11

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Re: 32/64 bit problem
by Shantonu Sen 09 Jun '11

09 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com No. The 64-bit Intel kernel was introduced with Mac OS X 10.6 (Snow Leopard) Shantonu On Jun 9, 2011, at 5:27 AM, Robert Bielik wrote: > Garth Cummings skrev 2011-06-09 14:10: >> The deployment target for x86_64 should also be 10.6. > > But didn't 64 bit support come with 10.5 ? Shouldn't I then need deployment target 10.5 for the kext to load > on 10.5 (and later) ? Hmm... confused. > > /R > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/ssen%40apple.com > > This email sent to ssen(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: 32/64 bit problem
by Robert Bielik 09 Jun '11

09 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; sv-SE; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 But didn't 64 bit support come with 10.5 ? Shouldn't I then need deployment target 10.5 for the kext to load on 10.5 (and later) ? Hmm... confused. /R _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Garth Cummings skrev 2011-06-09 14:10: The deployment target for x86_64 should also be 10.6. This email sent to site_archiver(a)lists.apple.com

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Re: 32/64 bit problem
by Garth Cummings 09 Jun '11

09 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com The deployment target for x86_64 should also be 10.6. There's Apple sample code that shows this called AppleSamplePCI. Best regards, --gc Sent from my iPhone On Jun 9, 2011, at 4:54 AM, Robert Bielik <robert.bielik(a)xponaut.se> wrote: > Chris Suter skrev 2011-06-08 11:40: >>> What to do ? Xcode doesn't allow me to build a UB with different SDKs for 32 >>> and 64 bit.. >> >> Yes it does. >> >> Search the list archives for other tips and also check the >> documentation. I've posted an answer to this in the past. > > Ok, found the way to add build conditions to deployment target and compiler in Xcode (can confess that Xcode is not > my main work IDE...). So now I have it set as: > > i386: > Base SDK: 10.6 > Deployment target: 10.4 > Compiler: GCC4.0 > > x86_64: > Base SDK: 10.6 > Deployment target: 10.5 > Compiler: GCC4.2 > > and it seems to work fine in both 32 & 64 bit :) > > Thnx! > /Rob > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/gcummings%40apple.com > > This email sent to gcummings(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: 32/64 bit problem
by Robert Bielik 09 Jun '11

09 Jun '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; sv-SE; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 What to do ? Xcode doesn't allow me to build a UB with different SDKs for 32 and 64 bit.. Yes it does. Search the list archives for other tips and also check the documentation. I've posted an answer to this in the past. Ok, found the way to add build conditions to deployment target and compiler in Xcode (can confess that Xcode is not my main work IDE...). So now I have it set as: i386: Base SDK: 10.6 Deployment target: 10.4 Compiler: GCC4.0 x86_64: Base SDK: 10.6 Deployment target: 10.5 Compiler: GCC4.2 and it seems to work fine in both 32 & 64 bit :) Thnx! /Rob _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Chris Suter skrev 2011-06-08 11:40: This email sent to site_archiver(a)lists.apple.com

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