January 2004 - Darwin-kernel

Re: exc_server "disappearing"
by keinmensch＠inbox.lv 14 Jan '04

14 Jan '04

Quoting Jim Magee <jmagee(a)apple.com>: > Are you writing your code in C++? If so, your code is probably looking > for the "mangled name" for the exc_server() routine. Within Xcode, the > warning messages have the mangling removed as well, so you don't really > see that you are looking for a mangled name. > > There is no published header for the server side of Mach exceptions. > So you have to generate your own. In it, you have to make sure the > prototype for it is declared "extern C {...}". If you use MIG to > generate the server header from the exc.defs file, it will be declared > that way by default. Thanks a lot for the swift reply ! Actually, I the code calling exc_sever was written in Objective-C, but in my larger program, I combined it with C++ code and compiled it as Objective- C++, thus being unable to link properly. A very quick fix to this problem is as follows: extern "C" { #import "exc_server.h" /* exception_raise.h defines exception_raise, exception_raise_state and exception_raise_state_identity */ #import "exception_raise.h" } Thanks again ! :-) Ivan A Krizsan _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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TAKE2: Problems testing with IOStorageFamily.kext
by Chris Walters 14 Jan '04

14 Jan '04

I'm developing a File System which is getting an EACCES error from doing a strategy call to the IOStorageFamily. I need to be able to build and install a debug version of IOStorageFamily. Building it is easy (with either ProjectBuilder or pbxbuild)... the problem is when I install and restart the system I get the "No Entry" symbol. Could somebody explain why my kext isn't working... * do I have to copy more than just the kext? * is there a difference between building with ProjectBuilder or pbxbuild? Thanks. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Re: exc_server "disappearing"
by Jim Magee 14 Jan '04

14 Jan '04

On Jan 14, 2004, at 4:06 PM, keinmensch(a)inbox.lv wrote: To my question: I have on an earlier occasion written code to handle exceptions using the exc_server () call in a ProjectBuilder project - a command-line tool to experiment with the "technology". Having gotten the opportunity to try to build that project in Xcode, it works just fine, even after having upgraded to native target. But then I want to use this code in a newly created project in Xcode, in order to build an application. No matter what I have tried, the linker complains about exc_server () being undefined. Are you writing your code in C++? If so, your code is probably looking for the "mangled name" for the exc_server() routine. Within Xcode, the warning messages have the mangling removed as well, so you don't really see that you are looking for a mangled name. There is no published header for the server side of Mach exceptions. So you have to generate your own. In it, you have to make sure the prototype for it is declared "extern C {...}". If you use MIG to generate the server header from the exc.defs file, it will be declared that way by default. --Jim _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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exc_server "disappearing"
by keinmensch＠inbox.lv 14 Jan '04

14 Jan '04

First of all, I am really sorry if I have managed to cross-post this request. To my question: I have on an earlier occasion written code to handle exceptions using the exc_server () call in a ProjectBuilder project - a command-line tool to experiment with the "technology". Having gotten the opportunity to try to build that project in Xcode, it works just fine, even after having upgraded to native target. But then I want to use this code in a newly created project in Xcode, in order to build an application. No matter what I have tried, the linker complains about exc_server () being undefined. I have included the System and Kernel frameworks in my new project (and also Foundation and AppKit, but they are not involved in these matters). I have also tried to directly include the libSystem.B.dylib, in which I suspect exc_server is defined, but without luck. I would be very grateful for any help in this matter as my graduation project depends on this code. Sincerely Ivan A Krizsan _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Re: scheduling question
by Jim Magee 14 Jan '04

14 Jan '04

On Jan 14, 2004, at 1:35 PM, Stefan Werner wrote: I am writing a real-time application and am in the optimization phase right now, playing with priorities and scheduling parameters. The critical thread in my application is a loop around recv() that is waiting for UDP packages and processes them upon reception. It should react on incoming packages as quickly as possible and get the processing done in a certain time. Now I'm wondering what's better suited for my thread: Real-time scheduling (guaranteeing my thread a certain time slice) or a "regular" thread with an insanely high priority? I tried some code snippets I found, one of them* is setting my thread to THREAD_TIME_CONSTRAINT_POLICY, the other is setting it to THREAD_PRECEDENCE_POLICY, in addition to setting threadExtendedPolicy.timeshare = 0. I tried them both, and with each of them my application performed much better than with standard threading. But still, it could be a tad better, and I guess I should start tweaking the parameters I pass to the functions. Before I spend too much time doing that, I wonder what will give me better results: time constraint or precedence policy? Will changing the process' priority improve anything or are my threads scheduled independently of the process? Handling network traffic in a realtime (as defined by THREAD_TIME_CONSTRAINT_POLICY) thread doesn't mix too well. Those threads are meant mostly for talking directly to external devices that can There are "helper" threads that process the data within the in-kernel network code somewhat isolating your thread from directly accessing the network hardware in that way. Your realtime thread may even interfere with the responsiveness of these helper threads in ways that might affect your own data. Even if you don't interfere with the processing of the in-kernel data, your response-time characteristics are going to be dominated by the scheduling behavior of these in-kernel threads. There are also situation where the network stack just borrows another user-level thread (that just happened to be in the network stack at the time) to drive completion of your packet handling (inbound and outbound). Obviously, you can't make these all realtime threads, so that too will affect your latency. For these reasons it is probably counter-productive to go all the way to a TIME_CONSTRAINT thread for this kind of data handling. The THREAD_PRECEDENCE_POLICY isn't really a completely different policy from the normal timeshare (migrating priority) policy on the system. It's just a way to control a key aspect of that policy. In essence, you are telling the schedule that, within this one process, some threads should have precedence over others even if they have the same priority. Essentially, you are assigning ordinal values to the process' threads without having to know or guess an appropriate system-wide priority for the threads. The system doesn't guarantee to honor it, but will attempt to do so (fairness may dictate that we chose threads to execute out of ordinal order). However, the effect should be process-local, and therefore cannot be relied upon to have any system-wide effect whatsoever. What has worked well for others in this type of situation is to use the THREAD_EXTENDED_POLICY notion to declare the thread as a "non-long-running" thread (by specifying the timeshare parameter as FALSE). As long as your thread is well behaved and gives up the CPU in reasonable amounts of time, it will always run at a fixed priority. As such, it will have significant preference over other threads in the system that are (or have been) consuming large amounts of CPU time (and are therefore likely to get in the time way of reasonable timeliness). --Jim _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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scheduling question
by Stefan Werner 14 Jan '04

14 Jan '04

Hi, I am writing a real-time application and am in the optimization phase right now, playing with priorities and scheduling parameters. The critical thread in my application is a loop around recv() that is waiting for UDP packages and processes them upon reception. It should react on incoming packages as quickly as possible and get the processing done in a certain time. Now I'm wondering what's better suited for my thread: Real-time scheduling (guaranteeing my thread a certain time slice) or a "regular" thread with an insanely high priority? I tried some code snippets I found, one of them* is setting my thread to THREAD_TIME_CONSTRAINT_POLICY, the other is setting it to THREAD_PRECEDENCE_POLICY, in addition to setting threadExtendedPolicy.timeshare = 0. I tried them both, and with each of them my application performed much better than with standard threading. But still, it could be a tad better, and I guess I should start tweaking the parameters I pass to the functions. Before I spend too much time doing that, I wonder what will give me better results: time constraint or precedence policy? Will changing the process' priority improve anything or are my threads scheduled independently of the process? Thanks, Stefan *) http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin… HGEFA _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Re: IOATAController device blocking bus
by RJ Auburn 14 Jan '04

14 Jan '04

*This message was transferred with a trial version of CommuniGate(tm) Pro* Is anyone else having problems getting IOATAFamily to compile? When try to compile the 10.3.2. version I get the following errors that are below. Maybe I'm missing some magic bit of the build setup or something. RJ Building target IOATAFamily with build style Development (optimization:level 0, debug-symbols:off) (1 error) /bin/mkdir -p /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext echo "=== Script ===" cat /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/BPTag000-script.sh echo "--- Output ---" /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/BPTag000-script.sh _result=$? echo "=== Exit code: ${_result} ===" exit ${_result} === Script === #!/bin/sh script="${SYSTEM_DEVELOPER_DIR}/ProjectBuilder Extras/Kernel Extension Support/KEXTPreprocess"; if [ -x "$script" ]; then . "$script" fi --- Output --- === Exit code: 0 === /bin/mkdir -p /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents/Resources /bin/mkdir -p /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents/Resources/English.lproj /Developer/Tools/pbxcp -exclude .DS_Store -exclude CVS -resolve-src-symlinks English.lproj/InfoPlist.strings /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents/Resources/English.lproj /bin/mkdir -p /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents /Developer/Tools/pbxcp -exclude .DS_Store -exclude CVS -resolve-src-symlinks /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/Info.plist /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents /Developer/Tools/pbxcp -exclude .DS_Store -exclude CVS -resolve-src-symlinks /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/pbdevelopment.plist /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.kext/Contents /bin/mkdir -p /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/Objects-normal/ppc /usr/bin/g++-3.3 -c -F/Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build -I/Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/include -arch ppc -fno-common -nostdinc -O0 -Wmost -Wno-four-char-constants -Wno-unknown-pragmas -I/System/Library/Frameworks/Kernel.framework/Headers -I/System/Library/Frameworks/Kernel.framework/Headers/bsd -I/System/Library/Frameworks/Kernel.framework/PrivateHeaders -fno-builtin -finline -fno-keep-inline-functions -force_cpusubtype_ALL -fno-rtti -fno-exceptions -fcheck-new -msoft-float -fapple-kext -mlong-branch -static -DKERNEL -DKERNEL_PRIVATE -DDRIVER_PRIVATE -DAPPLE -DNeXT -pipe "-fmessage-length=0" -Wp,-header-mapfile,/Users/rj/Desktop/Downloads/darwin/IOATAFamily -155.3.1/build/IOATAFamily.build/IOATAFamily.build/IOATAFamily.hmap -I/Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/DerivedSources -I/Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/DerivedSources ATADeviceNub.cpp -o /Users/rj/Desktop/Downloads/darwin/IOATAFamily-155.3.1/build/ IOATAFamily.build/IOATAFamily.build/Objects-normal/ppc/ATADeviceNub.o In file included from IOATAController.h:34, from ATADeviceNub.cpp:36: ATATimerEventSource.h:34:1: unterminated #ifndef from ATADeviceNub.cpp:36: In file included from IOATAController.h:34, ATATimerEventSource.h:34:1: unterminated #ifndef _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Problems testing with IOStorageFamily.kext
by Chris Walters 13 Jan '04

13 Jan '04

G'day, I'm developing a File System which is failing doing a strategy call to the IOStorageFamily. If I start my kext in a user context (i.e. when logged in) and run QuickTime on a movie it works fine. If I start the kext on boot and then log in and run the movie it fails on the strategy with EACCESS. I also found that if in the successful case I log out and log back in and attempt to run the movie it also fails. So... I want to be able to go into IOStorageFamily and see why it thinks I'm doing the wrong thing. I compile up the the kext (trying both ProjectBuilder and pbxbuild) and install it... after restarting the system I get a "No Entry" image. Fortunately I had a few different system partitions on the machine and could remedy the situation by puting the original back in place. It's not a permission problem... I've had that and can tell the difference. I also tried using gdb and stepping into IOStorageFamily but gdb is too stupid and decides that rather than stepping into dkstrategy (via d_strategy) it will continue instead. Can anybody give me any guidance on the EACCESS issue or building and installing my own IOStorageFamily? ... and advice on how to get gdb to work correctly (even if my symbol file for IOStorageFamily is incorrect). Thanks. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Re: IOATAController device blocking bus
by RJ Auburn 13 Jan '04

13 Jan '04

*This message was transferred with a trial version of CommuniGate(tm) Pro* On Jan 12, 2004, at 17:32, RJ Auburn wrote: >From looking around it looks like the message is from IOATAController::handleExecIO() line 922. I may see if I can get it to recompile with the ATA debug messages enabled to see if it turns anything up. I have not had a chance to run diff's between the 10.3.2 and 10.3.1 versions yet. So much for that idea. It looks like the code for IOATAController is the same in all panther releases... I will have to see if I can find anything else that might explain this... RJ --- RJ Auburn CTO, Voxeo Corporation tel:+1-407-418-1800 _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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Re: IOATAController device blocking bus
by Justin Walker 13 Jan '04

13 Jan '04

On Monday, January 12, 2004, at 05:32 PM, RJ Auburn wrote: *This message was transferred with a trial version of CommuniGate(tm) Pro* On Jan 12, 2004, at 16:23, Justin Walker wrote: On Monday, January 12, 2004, at 02:04 PM, RJ Auburn wrote: [snip] For me it's not CD related and it seems to be new with 10.3.2. It's odd that the symptoms are identical. I did first notice the problem with 10.3.x, but I'm not sure which 'x'. I wonder what's up with that... Sorry I can't help any more. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | Men are from Earth. | Women are from Earth. | Deal with it. *--------------------------------------*-------------------------------* _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)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.

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