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QuestionSimple UDP Server Pin
Andy2025-Sep-07 5:14
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QuestionHow to protect my vector, or any other variable? Pin
bosfan5-Sep-07 4:25
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Waldermort5-Sep-07 4:29
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QuestionRe: How to protect my vector, or any other variable? Pin
David Crow5-Sep-07 4:31
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AnswerRe: How to protect my vector, or any other variable? Pin
bosfan6-Sep-07 1:32
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GeneralRe: How to protect my vector, or any other variable? Pin
David Crow6-Sep-07 2:09
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AnswerRe: How to protect my vector, or any other variable? Pin
El Corazon5-Sep-07 4:55
MemberEl Corazon5-Sep-07 4:55 
termal wrote:
is it posible to protect environment variable in multithreaded application


Absolutely. The standard answer, is a mutex. Mutual exclusion prevents anything other than one thread from executing through a region of code. A primary way is with CriticalSections. However, it is important to note that you will be accessing the region of code in linear space. That is, you will reduce the code execution for that task to single threaded operation, so you want to make sure it is not your primary occupation of time.

There are other ways, google lock-free algorithms. A good CAS or CAS2 will give you the base structure to build a non-blocking synchronization system, but you will have to think on it. Qt uses something called "implicit sharing" meaning you want to share read access with all threads all the time, but you want to lock it for writing.

You can also use record locking, if you understand how to use a CAS or CAS2 step properly which will allow you to add/change a single vector item and block that one item from reading until the update step is completed, but allow all other reads to all other vector items to continue without delays.

You can also just pull down Intel's thread building blocks and use their threadsafe vector and be done with it all. Wink | ;) http://www.threadingbuildingblocks.org/[^]

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Questionproblem with WH_MOUSE_LL Pin
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QuestionHow to set the system time. Pin
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Questionconvertin a string into lowercase Pin
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AnswerIs your problem Solved. Pin
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QuestionHow to add virtual ip in the windows xp to using c++? songjacky 6hrs 12mins ago Pin
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