Re: [Development] Mutex future directions
Hi Bradley, And I don't think they very much liked the idea of spinning while trying to acquire a lock (consumes power)... at least we have a call to QThread::yieldCurrentThread(), though it would be interesting to see what happens if we replace it with a PAUSE instruction. Have you seen the spin code in 4.8? It does use QThread::yieldCurrentThread(). ;) I guess it depends a bit on if you want to yield to another thread or not ;-). Of course: burning cpu time is another way to solve this ;-) Greetings, Carsten -- Bradley T. Hughes bradley.hug...@nokia.com ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
Re: [Development] Mutex future directions
Hi Thiago, thanks for clearing this :-) I guess it depends a bit on if you want to yield to another thread or not ;-). Of course: burning cpu time is another way to solve this ;-) According to the Intel manual, if you *don't* yield and you don't have the PAUSE instruction, you may make things worse. What do you exactly mean with a PAUSE instruction. Is this a assembler processor command? For one thing, if you don't yield, the processor will continue executing your code, without giving a chance for other processes to run. There's no guarantee even in a multiprocessor system that the other thread is running. And even if it's running, if it was scheduled to another thread on the same hyperthreaded core, the processor may not execute the that thread because this thread still has instructions to execute. Interesting. Wouldn't it be better to change YieldCurrentThread? I guess, most of us are not aware of this and some of us learned in the 386 century that give back CPU performance to the OS is always a good thing. I guess it is even nowadays a good thing on single core machines. Isn't it? Thanks and Best Regards, Carsten ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
Re: [Development] Hiding Tabs in QTabWidget
Hi Jordi, thanks for the answer. Im looking forward to see you changes in QT 5.1 :-). Best Regards, Carsten Am 27.03.2012 07:51, schrieb Jordi Pujol: Sorry, answer sent only to Carsten ( my mistake... ) Afaik you only have the option to remove the tab . I've implemented that functionality, but right now I cannot contribute it to Gerrit ( no maintainer for QWidgets module no plans... ). If someone can tell me how to do it I'll be glad to do it for Qt5.1 El 26/03/2012 21:43, Carsten Breuer carstenbreue...@textwork.de escribió: Hi guys, i just spend some hours with trying to hide a tab in a QTabWidget that was designed with QtCreator (ui). After searching the web it seems to me that the only way to solve this is to use the removeTab function. I don't want to use removeTab, because this means that i have to save the tab text somewherem, have to deal with translations and with tab position dependencies and much more. All stuff, that smart Qt should do for me. Is there any other function that i can use to hide tabs? Someone...please :-) Best Regards, Carsten ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
[Development] Hiding Tabs in QTabWidget
Hi guys, i just spend some hours with trying to hide a tab in a QTabWidget that was designed with QtCreator (ui). After searching the web it seems to me that the only way to solve this is to use the removeTab function. I don't want to use removeTab, because this means that i have to save the tab text somewherem, have to deal with translations and with tab position dependencies and much more. All stuff, that smart Qt should do for me. Is there any other function that i can use to hide tabs? Someone...please :-) Best Regards, Carsten ___ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
