April 2010 - Darwin-dev - lists.apple.com

Re: using grand central dispatch with c++ for inter-thread communication
by Kevin Van Vechten 21 Apr '10

21 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Apr 21, 2010, at 11:32 AM, Joel Reymont wrote: > On Apr 21, 2010, at 7:26 PM, Kevin Van Vechten wrote: > >> However, this isn't exactly the "GCD" way of doing things. The true GCD way is to let the dispatch queue *be* the run loop, > > I may be wrong but it seemed from reading the source code that run loop _were_ implemented on top of dispatch queues. Is this not so? Not exactly. But ignoring the implementation details… The API for CFRunLoop requires that you manage the threads yourself. The goal of GCD is for you to work with queues that may or may not be backed by threads at any given time. 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: using grand central dispatch with c++ for inter-thread communication
by Joel Reymont 21 Apr '10

21 Apr '10

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=3z49aHHOzBOaCpuPkJaEV0XymUEBCc8M2ymRv8Si5Wg=; b=Xkcn/PXFCdNG8zIZ4be5FsYrJQxLk+pLrcrIahdiRbhFC3jUFhdkYvoZxPMBmjE1I6 kOrET2wMnO9sFF6thOikkUleEOfeaaGAWkDCH9j+a1v5UObbrb8AGZLATRDyLe0hSt8x b/wXGje++UQyTquztBeVReWqj91U9PPmLqh2k= 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=lwCmnh2Z6nH7ckXAMp7ykOcX4QBUBbnJZf1ViSDWOtENp4qBlcFu99Zstzi3yDOuB7 6dtXF8KmoBQqNf6MzcT38o+ogKB+Vm0BsZow56uHxJB3EAGQOW0cR1oCe+UPoS28LoUP SZuCWoKdAbDC21Caw20bELDjkbGfFsQZPDc6Y= On Apr 21, 2010, at 7:26 PM, Kevin Van Vechten wrote: > However, this isn't exactly the "GCD" way of doing things. The true GCD way is to let the dispatch queue *be* the run loop, I may be wrong but it seemed from reading the source code that run loop _were_ implemented on top of dispatch queues. Is this not so? Thanks, Joel --- http://es.linkedin.com/in/joelreymont http://twitter.com/wagerlabs _______________________________________________ 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: using grand central dispatch with c++ for inter-thread communication
by Kevin Van Vechten 21 Apr '10

21 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Joel, Good article. You describe a perfectly good technique for what you're trying to accomplish — inter-thread communication between existing (well known) threads running CFRunLoop — and there are plenty of instances where this is exactly the right thing to do, especially when bridging existing technologies together. However, this isn't exactly the "GCD" way of doing things. The true GCD way is to let the dispatch queue *be* the run loop, enqueue work asynchronously via dispatch_async, and have the system implicitly manage the threads for you. That's where the power and performance of GCD really shine. But don't get me wrong. I'm certainly happy to see you chose to write up an article describing the syntactic convenience of blocks, CFRunLoopPerformBlock and dispatch semaphores. Thanks! Kevin On Apr 21, 2010, at 8:45 AM, Joel Reymont wrote: > On Apr 21, 2010, at 4:14 PM, Brian Bechtel wrote: > >> Wouldn't pointing directly to the article be more efficient? >> >> <http://wagerlabs.com/grand-central-dispatch-c-and-inter-thread-com> > > A bit of context is probably due... > > I wrote a user land USB driver and packaged it in a framework. The framework starts the driver in a new thread upon initialization. I needed the separate thread and needed a way to talk to it. > > I explored Mach ports but these turned out to be too painful. Grand Central Dispatch, on the other hand, turned out to be the answer to my prayers. I can shuffle code and data back with no problems whatsoever. > > As a bonus, my API calls are queued and serialized for me so I don't need to lock portions of the driver for concurrent access. _______________________________________________ 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: using grand central dispatch with c++ for inter-thread communication
by David Leimbach 21 Apr '10

21 Apr '10

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:received:message-id:subject:from:to:cc:content-type; bh=FkYSEEulpDwUHr+aUW+pguNQOIc9eELjAt727fSbo00=; b=iwfeevlQ7y7LHwrxnpx7hX69rUGhH2ByCtF7nRWdvWCpdAcEnqfmn1NGsm8Tj37I6d ibFi8KmGPHq247zizagCvfMbGwwZH90tAqKHJjn9MTKR4HNBu3t0CoybX7ITpbNr84nP h6W0ACNLIzFhx5sQpMQDPaCINV3/kmc/+uJso= 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=h/JlYuT1+BaTfvxySsVa9PeRHppOMFnMK4KflfHJ4Pir79W2/WpSKZccbjmS9sfR39 CdTlSOC4py946CaZwRt5TtuY1VKD/S6eUaYZL+OYfe+Q3uwObXt70QvmAbseWi3BVz3e e+dAbmveeQavMmtS7Q2B8uWy60EI03EsBPS/Q= _______________________________________________ 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: using grand central dispatch with c++ for inter-thread communication
by Joel Reymont 21 Apr '10

21 Apr '10

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=7SyVHoqB86xO4Co9RvZM+PW4IiUdhGU+MyNr0UBl+EU=; b=naR2Iz3TAebzbZbeGm4kGs5erIoUyoayRZbE2MA9uJDgdki6uE8tH9nY6N0BZuYaIA DG+3b+LDiG7VicFdn/SvT83+O1Xv+lYtACjRmgydmsJWZ8wW46/turu7wApvlNE2YocR Vxb5UqL6afDIeO/IUHpXNJqIeInTmO/T+1Bs4= 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=abRONEIdzJPsTxGRUeNNQe5et/n4GTBvte+ljJZhv1VeWJL3ob3LgQOx8eddkUQpoY xTgcP7OGbCX07enb+wM5vHOKuQPLU2JBa/t5VKMBnwDDOUV6WDhbn38dhsedv+PPIKxg 3HTrrbzkoxcVKfa30T5g0VUeA04ODaDUvwJXk= On Apr 21, 2010, at 4:14 PM, Brian Bechtel wrote: > Wouldn't pointing directly to the article be more efficient? > > <http://wagerlabs.com/grand-central-dispatch-c-and-inter-thread-com> A bit of context is probably due... I wrote a user land USB driver and packaged it in a framework. The framework starts the driver in a new thread upon initialization. I needed the separate thread and needed a way to talk to it. I explored Mach ports but these turned out to be too painful. Grand Central Dispatch, on the other hand, turned out to be the answer to my prayers. I can shuffle code and data back with no problems whatsoever. As a bonus, my API calls are queued and serialized for me so I don't need to lock portions of the driver for concurrent access. --- http://es.linkedin.com/in/joelreymont http://twitter.com/wagerlabs _______________________________________________ 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: using grand central dispatch with c++ for inter-thread communication
by Brian Bechtel 21 Apr '10

21 Apr '10

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:received:message-id:subject:from:to:cc:content-type; bh=kjTjaWjdEztzkYpHdn/sVhEFunu/JrQS1dsQ9Grv1Wg=; b=cixT3Rd8qAZ5QpQvMzQxi2oMQ4nAmk57DgTTrkBmV29J89M42LQT1MT0/WqPFN1EJ3 dsPf1a3MJcn84LMo6Yr3zKb1EtlziuvjOarnNWbqwodgT35Hzg90PxRDTLewNlwOqqeb 8XlGV8vJbrs9YeKfbMkzvvxLD6x/EUoWVd5E4= 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=QqC/nIzeEoN0HjMCtmXA2kXuMLpPa/Tr9kEzKpOOihWlRBeoCEWz6D9RTYCNXL6vpX M+7/ZZIePlEZwxxARVv7Rg9Z8BwClt/18DI7UPg6KcOWbcTat0w2/iqetxMsKxxcr5qE f1PV2lVISr0wyhUTC2xzIfMe1skzWMGUEX6zI= On Wed, Apr 21, 2010 at 4:49 AM, Joel Reymont <joelr1(a)gmail.com> wrote: > Here's my write-up on using GCD with C++ for inter-thread communication: > > http://twitter.com/wagerlabs/status/12571649529 > > Please let me know what you think! Wouldn't pointing directly to the article be more efficient? <http://wagerlabs.com/grand-central-dispatch-c-and-inter-thread-com> Thanks for the article! _______________________________________________ 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: need help on porting from 32bit to 64bit.
by Jean-Daniel Dupas 21 Apr '10

21 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Swapping byte on OS X is a matter of taste. OSSwap API (libkern) NSSwap API (Foundation) CFSwap API (CoreFoundation) Core Endian API (CoreServices) and probably other hidden somewhere. Le 21 avr. 2010 à 14:22, Nico Schmidt a écrit : > What about OSSwapBigToHostInt64 and OSSwapHostToBigInt64 both from #include <libkern/OSByteOrder.h> ? > > Nico > > On 21.04.2010, at 14:05, Arnab Ganguly wrote: > >> Hi All, >> I am porting my application from 32bit to 64bit.I see functions like ntohl and htonl is being used. What should I use it equivalent in 64bit code base. >> Thanks, >> -A -- Jean-Daniel _______________________________________________ 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: need help on porting from 32bit to 64bit.
by Nico Schmidt 21 Apr '10

21 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com What about OSSwapBigToHostInt64 and OSSwapHostToBigInt64 both from #include <libkern/OSByteOrder.h> ? Nico On 21.04.2010, at 14:05, Arnab Ganguly wrote: > Hi All, > I am porting my application from 32bit to 64bit.I see functions like ntohl and htonl is being used. What should I use it equivalent in 64bit code base. > Thanks, > -A > _______________________________________________ > 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/lists%40nschmidt.name > > This email sent to lists(a)nschmidt.name _______________________________________________ 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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need help on porting from 32bit to 64bit.
by Arnab Ganguly 21 Apr '10

21 Apr '10

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:received:message-id :subject:from:to:content-type; bh=UNLeWtd6iQKqIpLv7WWVLfyHCz7DOOmbh8YUq1AvUGo=; b=ipvU7aGhYborOi9eKSeycWFsA/S0rkex7lEM3TDxondwklkO1Ik3/dZ/D0DC+pzA3c lF8qOjwsuFl9KvcLPzHV0U+4/wXGALoTSFip8jEcR8QVt6fu+M3CORYaqbjbcplCzcHD 31lBrO5olEfu59vqbU4A/rKmuy5zWiGkKPuUw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=c70e4+9yBCBIJTPuISvWA7WK/QLolU5K6nDOqAdliNpWBxdbWqHr0Mpi1Y1JleC0uz ShN6L3JIPu/ox8etLHcH5dI4VjNKEaznGFv4D+4DVZXrdGl6cdUN2YlL/Hx9k3uRxC2J RY25oxYZqcJgNLWxZ7JRqILCcmCFFw+QUcFuc= _______________________________________________ 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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using grand central dispatch with c++ for inter-thread communication
by Joel Reymont 21 Apr '10

21 Apr '10

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:from:content-type :content-transfer-encoding:subject:date:message-id:to:mime-version :x-mailer; bh=nad2nm7KereGlnnrhKqcQeC2KtQL0o+tmFrNfEa1m7c=; b=vrXzuQV3oKIoD6bn8BQVbqtt/fJuxkHe8hdWCt2qVlYmDRCTVUJ5T3+2wNRPED0FD9 t3QVIr08ygi2hvKJsDeF/KpQ6d60dSC7IhwcmJ1ep+zBD24GvGhUkOzT5Ctxgh96P3be Ry+ZX8mvW63Zvb6tuLqbSaBG8f/Af8IVd4CQ0= 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=fsw1MxH5goYnziHQkt/zUCHzyU05LrRfaEszmvWnSQFsWQP7et2DMj11b6prcVAZOd 8dSidL76VkRl4l1MajYqF5dVwJHwjRuz5BMwm75L8jOht3yz2+KsTRRqsRyNc2jw16aU UZ8YqG24o4DA8l438Yon7/eBY0/Y4jLY164Hc= Here's my write-up on using GCD with C++ for inter-thread communication: http://twitter.com/wagerlabs/status/12571649529 Please let me know what you think! Thanks, Joel --- http://es.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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