Friday, May 24, 2013

MultiThreading And Arrays? - C And C++ | Dream.In.Code


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    3 Replies - 36 Views - Last Post: Yesterday, 10:11 PM Rate Topic: -----

    #1 zehawk ?Icon User is offline

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    Posted Yesterday, 09:45 PM

    I know how to code it, I was just curious, using WINAPI threading, which I have gotten down, I was wondering if it was possible to access the same array with multiple threads. I know for sure that, say, thread one needs index 1 and thread two needs index 1, whichever gets there first has it, but can i access the same array overall with different threads? I know how to code it, so this is a conceptual question. I looked it up on google, but can't find any answers.


    Is This A Good Question/Topic? 0

    Replies To: MultiThreading and Arrays?

    #2 Aphex19 ?Icon User is offline

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    Re: MultiThreading and Arrays?

    Posted Yesterday, 09:55 PM

    Yes, different threads can access the same resources, since threads within a single program share the same address space. However, care should taken that access is thread safe (a resource is only accessed by one thread at a time). For this, you can use critical sections.

    #3 Skydiver ?Icon User is online

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    Re: MultiThreading and Arrays?

    Posted Yesterday, 09:57 PM

    All threads can always read. It's not a matter of the first reader locking out the other readers.

    Writing on the other hand can get a little dicey. Writing also does not lock out the other writers. The last writer wins. This can cause some confusion in your program logic if you have two threads writing and each thought that their write was the winner.

    This is why you usually want to have some kind of synchronization mechanism to only allow one writer at a time so that you can have some kind of certainty of what order operations happen in. Also the synchronization helps if you need to prevent writers from writing while you are in the process of reading and need some kind of stability in the values.

    This post has been edited by Skydiver: Yesterday, 09:58 PM


    #4 zehawk ?Icon User is offline

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    Re: MultiThreading and Arrays?

    Posted Yesterday, 10:11 PM


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    Source: http://www.dreamincode.net/forums/topic/321712-multithreading-and-arrays/

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