March 2007 - Darwin-dev - lists.apple.com

Re: Do #pragma weak work in Darwin?
by Paul Nelson 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcdqNGKxoX2MftYnEdui4gAWy4i6sAAOjNhMAALcPvw= Thread-topic: Do #pragma weak work in Darwin? User-agent: Microsoft-Entourage/11.3.3.061214 The pragma in it's basic form compiles, but does not appear to work. The pragma in it's alias form gives a warning, and is ignored. I think the docs only mean to say the pragmas will compile. They don't say the resulting code will work. Here is a test sample: src $ cat weaklink1.c #include <stdio.h> #pragma weak testweak /* #pragma weak testweak = mytestweak */ int mytestweak() { return 1; } int main( int argc, const char * argv[] ) { int res = testweak(); printf("testweak() = %d\n", res); } src $ cc -g -o testweak weaklink1.c /usr/bin/ld: Undefined symbols: _testweak collect2: ld returned 1 exit status src $ Also this: cat weaklink1.c #include <stdio.h> #pragma weak testweak = mytestweak int mytestweak() { return 1; } int main( int argc, const char * argv[] ) { int res = testweak(); printf("testweak() = %d\n", res); } src $ !cc cc -g -o testweak weaklink1.c weaklink1.c:13: warning: alias definitions not supported in Mach-O; ignored /usr/bin/ld: Undefined symbols: _testweak collect2: ld returned 1 exit status src $ on 3/19/07 4:36 PM, Conrad G T Yoder at conrad(a)yoders.org wrote: > At 3/19/07 10:39 AM -0500, Paul Nelson <nelson(a)thursby.com> wrote: >> >> There are two forms, but both seem to be ignored by GCC: >> >> #pragma weak ext_function >> >> and >> >> #pragma weak ext_function = my_default_ext_function >> void my_default_ext_function() >> { >> } > > Information is available in the Xcode documentation. > > -Conrad _______________________________________________ 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: Do #pragma weak work in Darwin?
by Conrad G T Yoder 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcdqNGKxoX2MftYnEdui4gAWy4i6sAAOjNhM Thread-topic: Do #pragma weak work in Darwin? User-agent: Microsoft-Entourage/11.3.3.061214 At 3/19/07 10:39 AM -0500, Paul Nelson <nelson(a)thursby.com> wrote: > > There are two forms, but both seem to be ignored by GCC: > > #pragma weak ext_function > > and > > #pragma weak ext_function = my_default_ext_function > void my_default_ext_function() > { > } Information is available in the Xcode documentation. -Conrad -- Suspicion breeds confidence. _______________________________________________ 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 smime.p7s

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Re: Thread number
by Paul Nelson 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com Thread-index: Acdqad+rHhHJvtZdEdui4gAWy4i6sA== Thread-topic: Thread number User-agent: Microsoft-Entourage/11.3.3.061214 Here is what I do: (gdb) info threads 3 process 12851 thread 0x3003 tss_resolver_thread (arg=0x0) at /xx.c:471 2 process 12851 thread 0x1607 0x90009bf7 in mach_msg_trap () * 1 process 12851 local thread 0x1003 resolver_thread_initialize () at /xx.c:560 After a thread is created using pthread_create( &resolver_thread, NULL, tss_resolver_thread, NULL ); (gdb) print resolver_thread $3 = (pthread_t) 0x180be00 (gdb) x/16x resolver_thread 0x180be00: 0x54485244 0x00000000 0x00000000 0x00010101 0x180be10: 0x00001000 0x00000000 0x0000001f 0x0000000a 0x180be20: 0x00000000 0x00000000 0x00000000 0x00000000 0x180be30: 0x00000000 0x00003003 0x00023944 0x00000000 notice that the uint32 at pthread_t+34 is the same value that gdb prints for the thread number. Paul Nelson Thursby Software Systems, Inc. on 3/19/07 3:35 PM, David Alter at David(a)alterConsulting.net wrote: > My apologies if this is too basic of a question. I have not had much > success in finding an answer searching the archives. > > I want to get the thread number for a pthread. When I say the thread > number, I'm looking for the same thread number that gdb would use > when selecting threads to debug. I want the thread number to be part > of the information I log. > > I can get pthread_t easily but how do I then the thread number out of > that. Or do I need to look somewhere else for this information. > > to get pThread_t ... > > pthread_t thread = pthread_self(); > > thanks for the help > -dave > > > _______________________________________________ > 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/nelson%40thursby.com > > This email sent to nelson(a)thursby.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: Thread number
by Ed Wynne 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com On Mar 19, 2007, at 4:35 PM, David Alter wrote: I don't mean to be disheartening, but I think this is impossible. -Ed _______________________________________________ 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… I want to get the thread number for a pthread. When I say the thread number, I'm looking for the same thread number that gdb would use when selecting threads to debug. I want the thread number to be part of the information I log. Last I knew, the thread number gdb used was the mach_port_t naming the underlying mach thread. The problem with this is that mach ports are like file descriptors. They are just process specific integer values used to name kernel resources. You can figure out the mach_port_t for your thread in your process by calling pthread_mach_thread_np(), but when gdb asks mach for your threads it'll receive them with mach_port_t assignments that are specific to it's process context. Gdb's mach_port_t's won't have any relation to your mach_port_t's. Just like if your process and gdb opened the same file, their fd's would be entirely unrelated. That said, it is possible for gdb to figure out the mach_port_t values from your processes perspective and display them... but last I checked, it didn't. This email sent to site_archiver(a)lists.apple.com

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Thread number
by David Alter 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com to get pThread_t ... pthread_t thread = pthread_self(); thanks for the help -dave _______________________________________________ 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… My apologies if this is too basic of a question. I have not had much success in finding an answer searching the archives. I want to get the thread number for a pthread. When I say the thread number, I'm looking for the same thread number that gdb would use when selecting threads to debug. I want the thread number to be part of the information I log. I can get pthread_t easily but how do I then the thread number out of that. Or do I need to look somewhere else for this information. This email sent to site_archiver(a)lists.apple.com

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Re: examples of OSX volume control?
by Garth Cummings 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.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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Do #pragma weak work in Darwin?
by Paul Nelson 19 Mar '07

19 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcdqNGKxoX2MftYnEdui4gAWy4i6sA== Thread-topic: Do #pragma weak work in Darwin? User-agent: Microsoft-Entourage/11.3.3.061214 There are two forms, but both seem to be ignored by GCC: #pragma weak ext_function and #pragma weak ext_function = my_default_ext_function void my_default_ext_function() { } _______________________________________________ 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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examples of OSX volume control?
by jmzorko＠mac.com 18 Mar '07

18 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello, all ... Regards, John Falling You - exploring the beauty of voice and sound http://www.fallingyou.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… Can someone point me to some basic examples of how to control the volume of the left / right speakers under OSX, something similar to the Win32 mixer API (but if it's even simpler, great -- I only need to control volume, nothing else)? Also, though C++ is preferred (so I guess that means Carbon), an ObjC (Cocoa) example would also work. This email sent to site_archiver(a)lists.apple.com

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Re: WakeUp from sleep
by Finlay Dobbie 17 Mar '07

17 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=UehSYkqc7ST+t5neUkpLhnuh53eYG+XHE6Be75rMMcfBRQyQ2CkVYJrBv7MFlsos9OwfmvI5sbloYXimd3ZJynwPLsssKPACI9bKzKQyXNY56lczGbLg92THeOE7D811k1RbZ79YCTWHUvujrIdtXZJ7jrRAbGk69l5WdChII6E= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qfI9rfccFAAUFw5zLqacj+jdMTdJZb6YM9QK6cDg6CLHwNAYIub8jFhAD/tp1zkBDtfUEHibmA6NU5gq6NAsTgXicNke7N4H1+nql7EtGbw2giRaQ++ULLNl6BWIoNXeX0cjfuYP23XTsHQp+M5b5xof3sfpXX46vhu1p1tv92E= I am sorry if this isn't the right list... I need to be notified inside my console app when the computer "WakeUp" from "Sleep". I downloaded the PM DDK SDK but I haven't found a way to solve my issue. Please note that I cannot run my process as run and I do not need to write anything, I just need to be notified in some way. Have you read <http://developer.apple.com/qa/qa2004/qa1340.html>? -- Finlay _______________________________________________ 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… On 17/03/07, Marco Bambini <marco(a)vampiresoft.com> wrote: This email sent to site_archiver(a)lists.apple.com

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WakeUp from sleep
by Marco Bambini 17 Mar '07

17 Mar '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com I am sorry if this isn't the right list... Thanks a lot for you help, Marco Bambini _______________________________________________ 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… I need to be notified inside my console app when the computer "WakeUp" from "Sleep". I downloaded the PM DDK SDK but I haven't found a way to solve my issue. Please note that I cannot run my process as run and I do not need to write anything, I just need to be notified in some way. This email sent to site_archiver(a)lists.apple.com

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