multithreading in C++

This is a discussion on multithreading in C++ within the C++ Programming forums, part of the General Programming Boards category; how to do multithreading in C++ on Windows platform.... What would be good??? do it using the Win32 platform or ...

  1. #1
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    multithreading in C++

    how to do multithreading in C++ on Windows platform....

    What would be good??? do it using the Win32 platform or Boost library ??? or is there any other waY?


    EDIT: I haven't done any multithreading programming and have no idea of it.. So what should I learn????
    Last edited by manzoor; 11-27-2008 at 06:36 AM.

  2. #2
    Malum in se abachler's Avatar
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    CreateThread() is my favorite, of course the flamewar will now begin (again) between me and people that prefer beginthread() or boost. Theres also the OpenMP option, depending on what specifically you are trying to accomplish.
    Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.

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    C++まいる!Cをこわせ! Elysia's Avatar
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    ...Basically, it says use beginthread, unless you are using MFC. It's the safest way and it will avoid all the issues vs the discussion.
    I don't know if Boost is better.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    isn't beginthread() a C function ?

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    C++まいる!Cをこわせ! Elysia's Avatar
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    Yeah, it is. There is no C++ equivalent.
    CreateThread is a C function, too.
    But you can try Boost's threads too. They are C++.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    msdn says to use beginthread if you're using the C runtime library, or you can leak stuff. (so i guess CreateThread if you're only linking C++ libs)
    AfxBeginThread for MFC.

    also, boost's implementation uses _beginthreadex

  7. #7
    Cat without Hat CornedBee's Avatar
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    Never use _beginthread. It's conceptually broken. It's been completely superseded by _beginthreadex.

    Never use raw CreateThread if you use the C or C++ runtime library. abachler may call it a flamewar of people with different preferences, but it's really about one thing being wrong and the other correct, with no space for opinion.

    Boost's threading library is superior to all C-style alternatives, though, because it provides RAII synchronization primitives and allows you to provide an arbitrary function object (including a bound member function) as the thread starting function.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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    Super Moderator VirtualAce's Avatar
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    I always use _beginthreadex b/c MSDN specifically says do not use CreateThread or it mentions that one should prefer to use _beginthread or _beginthreadex. _beginthreadex is the best choice for multi-threading...at least for now.

  9. #9
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    What exactly is it about CreateThread() that's broken, and can't they fix whatever is broken?
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

    "the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010

  10. #10
    Malum in se abachler's Avatar
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    Its not broken, but you can leak handles if you dont track them and close them when the thread terminates. Theres also some funky stuff that can happen if you creat the thread as suspended without enough memory to allocate its stack, but that isnt limited to CreateThread. Theres a fairly lengthy thread somewhere where we realyl got into it and I explained the issues and non-issues with CreateThread vs beginthread(ex). The fact is I have never had a problem with CreateThread, and it isnt from a lack of trying.

    Just because others have fallen to their deaths doesnt mean I am wrong for working without a net.
    Last edited by abachler; 11-27-2008 at 09:15 PM.
    Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.

  11. #11
    and the hat of sweating
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    I think I use it too (not that I create multi-threaded apps that often), although I never use MFC.
    But why doesn't beginthreadex() have that same problem then?
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

    "the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010

  12. #12
    Malum in se abachler's Avatar
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    It does, but some people read something on MSDN and take it as gospel, because Microsoft is infallable dont you know.

    I challenge anyone to show concrete proof (i.e. actual code) showing CreateThread being broken where beginthread works. Im tired of all this ad hominem appeal to authority crap.
    Last edited by abachler; 11-27-2008 at 09:28 PM.
    Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.

  13. #13
    Super Moderator VirtualAce's Avatar
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    Im tired of all this ad hominem appeal to authority crap.
    You seem to be tired of any type of authority.

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    I would say that Microsoft is the ultimate authority on their own software. Whether you believe that or not, I don't care, but I think it is a pretty safe assumption. If Microsoft recommends that a particular function be used instead of another, I see no reason to doubt it.

    Personally, I prefer pthreads. it is multi-platform, and works very well for anything I've ever needed it for.

  15. #15
    Kiss the monkey. CodeMonkey's Avatar
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    I have read with interest about Boost's solution. Does anybody have any first-hand experience with the library?
    "If you tell the truth, you don't have to remember anything"
    -Mark Twain

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