December 2009 - Darwin-dev - lists.apple.com

Re: ucontext switch problem
by Chris Suter 14 Dec '09

14 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Steve, On Mon, Dec 14, 2009 at 12:02 PM, Steve Checkoway <s(a)pahtak.org> wrote: > Is that documented somewhere? The man pages don't mention it. <http://developer.apple.com/mac/library/qa/qa2005/qa1419.html> just says it must be a multiple of 4096 bytes. The only documentation I found was the source code, but I haven’t really looked. :-) >> You are aware that the ucontext stuff is deprecated on OS X, aren’t you? > What replaces them? What about signal handlers installed via sigaction that get passed a ucontext_t? Is that deprecated too? Sorry, I don’t know. The ucontext.h header file just says those routines (*context) are deprecated. I would have thought that you could rely on them working until 10.7 though. To replace them, you can use regular threads or grand central dispatch (10.6 only) or something else. I don’t know exactly what you’re trying to do. Kind regards, Chris _______________________________________________ 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: ucontext switch problem
by Steve Checkoway 14 Dec '09

14 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Dec 13, 2009, at 3:54 PM, Chris Suter wrote: > On Sat, Dec 12, 2009 at 11:22 PM, Roger Pau Monné <royger(a)gmail.com> wrote: >> Hello, >> I'm trying to run a simple application in Mac OS X 10.5.8 that uses ucontext >> system calls getcontext, makecontext and switchcontext. I know it works on >> Linux, but I haven't been able to run it in Mac OS X. The code is pretty >> simple, it just switches context from two functions: > [snip] > > Your stack isn’t big enough. It needs to be at least 32K. Is that documented somewhere? The man pages don't mention it. <http://developer.apple.com/mac/library/qa/qa2005/qa1419.html> just says it must be a multiple of 4096 bytes. > You are aware that the ucontext stuff is deprecated on OS X, aren’t you? What replaces them? What about signal handlers installed via sigaction that get passed a ucontext_t? Is that deprecated too? -- Steve Checkoway _______________________________________________ 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: ucontext switch problem
by Chris Suter 13 Dec '09

13 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, On Sat, Dec 12, 2009 at 11:22 PM, Roger Pau Monné <royger(a)gmail.com> wrote: > Hello, > I'm trying to run a simple application in Mac OS X 10.5.8 that uses ucontext > system calls getcontext, makecontext and switchcontext. I know it works on > Linux, but I haven't been able to run it in Mac OS X. The code is pretty > simple, it just switches context from two functions: [snip] Your stack isn’t big enough. It needs to be at least 32K. You are aware that the ucontext stuff is deprecated on OS X, aren’t you? Kind regards, Chris _______________________________________________ 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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Strange semget/semop "abort" crash
by Stéphane Letz 13 Dec '09

13 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, We get a strange crash log in our code that uses the semget/semop API and cause an "abort" on OSX 10.6.2. Here is the log and the code that crashes: • Thread 0 Crashed: Dispatch queue: com.apple.main-thread • 0 libSystem.B.dylib 0x941b2732 __kill + 10 • 1 libSystem.B.dylib 0x941b2724 kill$UNIX2003 + 32 • 2 libSystem.B.dylib 0x9424598d raise + 26 • 3 libSystem.B.dylib 0x9425ba44 abort + 93 • 4 Jackmp 0x1648bbb5 semaphore_init + 197 • 5 Jackmp 0x1648bdb5 jack_initialize_shm + 389 • semaphore_init () { key_t semkey = JACK_SEMAPHORE_KEY; struct sembuf sbuf; int create_flags = IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; /* Get semaphore ID associated with this key. */ if ((semid = semget(semkey, 0, 0)) == -1) { /* Semaphore does not exist - Create. */ if ((semid = semget(semkey, 1, create_flags)) != -1) { /* Initialize the semaphore, allow one owner. */ sbuf.sem_num = 0; sbuf.sem_op = 1; sbuf.sem_flg = 0; if (semop(semid, &sbuf, 1) == -1) { semaphore_error ("semop"); } } else if (errno == EEXIST) { if ((semid = semget(semkey, 0, 0)) == -1) { semaphore_error ("semget"); } } else { semaphore_error ("semget creation"); } } } What could be the reason? Thanks Stéphane Letz _______________________________________________ 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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ucontext switch problem
by Roger Pau Monné 12 Dec '09

12 Dec '09

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:mime-version:received:date:message-id:subject :from:to:content-type; bh=xDsfaO9MCIsOOmC8TPIzpSp+DX6wI5CQO1Azo7amloA=; b=PumawsCxHk0/ZqvdLgGsQTJDCkd5gnOhi3jx3KNOKLd+5F8hQ5g5cStz/pWRzmO3zS Rf1d72DXC+m9GXhw9u9ujJ6sfPgfcR1hIeAQ8/C8EEq0vUdW9KtfmUliIHMniiLQfHxI nL60Y/6Yojk9xkcaimZbXMK2QSRmppdjcknv0= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=M/kNJgZ0la1+LgIOe73C8y5XE/r6/5pRiOpvnbMXJclCB0YXW7oU8qH5R6jFrJjBRi bvHQqLBuyzkhmgbHlYp5SUePQAIZYwHKnYVBsounognW/qSsXPXWZPJ5yb5KkB1SNRdz W77+f1tsZ5SqSXKorfKSY76sESDU6gC33UuPk= _______________________________________________ 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: explanation of page in and page cache hit
by Shawn Erickson 11 Dec '09

11 Dec '09

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:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=ohEXQ5o9sQwvA8EgWh+V2SXHsFZ2Kfn/6D0XfRC820M=; b=K0bbLTfQ19PLSgYKVy2Uu4frK5JMlrm1Ut8hfFc5yVNHsPZNkZG2kMbuapaelmKL2w CObeAtmePHKozN+jz9KZsXkzy05g70szLr7BA+t16FZ2GzNeDBmKIt5ynSSiBhabct4v r7pR5qio6SD1NJFAJVjDgnk8jWxdSCBHJd0ao= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=uZGCBEiCT+7CwWenIjti6+euVNxRGzgMtiez1mdgMckJqYHGKmU15y6zGL88ayub/7 TkmPK/UUighp2xkvVyoXby9G2nPZG+adE2gRwUlR+yL0sOfbGpCd51/g5KlG2sBij8/4 7bbvihXW6ONX3Iux9XQBGBsmVPeu3pp9VH0pc= On Fri, Dec 11, 2009 at 2:42 AM, Joel Reymont <joelr1(a)gmail.com> wrote: > > On Dec 11, 2009, at 4:06 AM, Dan Shoop wrote: > >> Use of the word "unmapped" here is rather fuzzy. What does the OP mean by this? > > All the terms used by the OP are taken from Shark documentation ;-). Yup, which is what I scoped my response specifically to. -Shawn _______________________________________________ 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: -mdynamic-no-pic on x86-32 vs 64
by Kevin Van Vechten 11 Dec '09

11 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Dec 11, 2009, at 9:39 AM, Joel Reymont wrote: > > On Dec 11, 2009, at 5:33 PM, Shantonu Sen wrote: > >> -mdynamic-no-pic is not supported for x86_64 (it is silently ignored), which is why you don't get an error. > > Any particular reason for ignoring this on x86-64? x86_64 supports instruction pointer relative addressing (%rip) so there's virtually no penalty for PIC, and correspondingly no benefit from compiling without PIC. Kevin _______________________________________________ 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: -mdynamic-no-pic on x86-32 vs 64
by Joel Reymont 11 Dec '09

11 Dec '09

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:received:received:subject:mime-version :content-type:from:in-reply-to:date:cc:content-transfer-encoding :message-id:references:to:x-mailer; bh=+xxXuMHJ1e7bXkPMoLV0pFEo/+sQtgXwpf4rPx4rXkk=; b=a7A/FjN3XwpoTg8IZHSvWIRhZ+ETvCr1VAJNcIggp0gdWtvHUKZZmZeZ+kOHhiub/j gWFxIAJe219g+Ht/hmXOCqlz8D81dibX+REnmIv5prbeWDVpw2DRhSFjv34TyCod7RE1 e36XWmhuOYMQK2cXBZlw5EBK1iYEIo5FUwAmQ= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; b=lthyRmbZqUyE0t04T5ICAwJ2qa+/fvqmWvvNL43aga12hPl8BMQOfehH05nYpVAT8z 35CfeikCx2WSd+dPTUGmvEcuTZqQSAnzqJhwqpshGllo4md85V0mdRBa8kdpyHvml7TP S2PvRWdnYQEE5ljskA+CoRsucRQUJvbJ9GdwE= On Dec 11, 2009, at 5:33 PM, Shantonu Sen wrote: > -mdynamic-no-pic is not supported for x86_64 (it is silently ignored), which is why you don't get an error. Any particular reason for ignoring this on x86-64? > Performance gains are probably illusory, and you would get it without -mdynamic-no-pic. I swear I saw a marked improvement. I'll take another look at the results in an hour or so, after a couple of builds of Firefox. Thanks, Joel --- Mac hacker with a performance bent http://www.linkedin.com/in/joelreymont _______________________________________________ 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: -mdynamic-no-pic on x86-32 vs 64
by Shantonu Sen 11 Dec '09

11 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -mdynamic-no-pic is not supported for x86_64 (it is silently ignored), which is why you don't get an error. Performance gains are probably illusory, and you would get it without -mdynamic-no-pic. Under i386 you are attempting to link -mdynamic-no-pic code into a shared library, which is not supported. Don't do that. Shantonu Sen ssen(a)apple.com Sent from my Mac Pro On Dec 11, 2009, at 9:29 AM, Joel Reymont wrote: > The reason I want to use -mdynamic-no-pic is that it seems to give Firefox a large performance boost on Snow Leopard when compiled mostly statically and for x86-64. > > Thanks, Joel > > --- > Mac hacker with a performance bent > http://www.linkedin.com/in/joelreymont > _______________________________________________ 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: -mdynamic-no-pic on x86-32 vs 64
by Joel Reymont 11 Dec '09

11 Dec '09

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:received:received:subject:mime-version :content-type:from:in-reply-to:date:cc:content-transfer-encoding :message-id:references:to:x-mailer; bh=hgh893WRPBAV8Qndnyd4Ol8ijppGw/FjBBmEidLbU84=; b=jFFbTQvQq6lz3O/YVGartDzxZCwCcQXtFQXOVHDWq2zUF5eu1X/UFV1ygQe1doDO2d oG/NpuTDx3W4fpq7/mBT+82mErh507aIwXTnNtuMy2yWU1ZKgga013LzgybNTPf/Fmjc twQWhyC6/+SWexZr8DeapWSskC5ll+xLD7Co4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; b=dPndq7dOldoiIJBlg7vt6OvVvXVIQM7tvwk4wt6J40dhZDnVrEj0n7jnE/d6e1hN/G o/h2insS3oV4kj304RI5+BqpYARmBs747QKR4fYguAfYq/2e/URtg0wwlKrirHgfENhy ijREPwtdks2LzPrUBRC08qr1UlLB5KULrRxzQ= The reason I want to use -mdynamic-no-pic is that it seems to give Firefox a large performance boost on Snow Leopard when compiled mostly statically and for x86-64. Thanks, Joel --- Mac hacker with a performance bent http://www.linkedin.com/in/joelreymont _______________________________________________ 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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