C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  volatile variables          C++Talk.NET Forum Index -> C Language View previous topic :: View next topic   Author Message junky_fellow@yahoo.co.in Guest Posted: Mon May 14, 2007 9:12 am    Post subject: volatile variables Guys, If I have a global variable, that is shared across multiple threads on an SMP environment, then do I need to declare it as volatile, so that a particular processor does not store and access its vlaue fron the processor registers ? thnaks in advance for any help ... Back to top Hari Guest Posted: Mon May 14, 2007 9:12 am    Post subject: Re: volatile variables junky_fellow (AT) yahoo (DOT) co.in je napisao: Quote: Guys, If I have a global variable, that is shared across multiple threads on an SMP environment, then do I need to declare it as volatile, so that a particular processor does not store and access its vlaue fron the processor registers ? thnaks in advance for any help ... Having volatile type qualifier is mainly to do with the problems that are encountered in real-time or embedded systems. Quote: so that a particular processor does not store and access its vlaue fron the processor registers yes, volatile will use direct access, and probably switch of optimization Quote: If I have a global variable, that is shared across multiple threads on an SMP environment, then do I need to declare it as volatile I think that you must use some thread locking mechanism, not volatile, to use global variable with multiple threads. Search net for thread locking for your platform. Best, Zaharije Pasalic Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C Language All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.