FAQ: How to do simple multi-threading in C/C++? (C++)

This is a discussion on FAQ: How to do simple multi-threading in C/C++? (C++) within the FAQ Board forums, part of the General Programming Boards category; Hi Everyone I like to know how I can implement multi-threading in C/C++ programs. Is it possible to do multi-threading ...

  1. #1
    Registered User sbasak's Avatar
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    FAQ: How to do simple multi-threading in C/C++? (C++)

    Hi Everyone

    I like to know how I can implement multi-threading in C/C++ programs.

    Is it possible to do multi-threading with only one processor?

    Can you please show me a SIMPLE C/C++ program which performs multi-threading?

    I am using Visual C++ 5 compiler.

    Thanks a lot :-)

  2. #2
    btq
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    julie lexx... btq's Avatar
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    something like this:
    Code:
    DWORD WINAPI ThreadFunc( LPVOID lpParam )  
    { 
        char szMsg[80];
    
        wsprintf( szMsg, "ThreadFunc: Parameter = %d\n", *lpParam ); 
        MessageBox( NULL, szMsg, "Thread created.", MB_OK );
    
        return 0; 
    } 
     
    VOID main( VOID ) 
    { 
        DWORD dwThreadId, dwThrdParam = 1; 
        HANDLE hThread; 
        hThread = CreateThread( 
            NULL,                        // no security attributes 
            0,                           // use default stack size  
            ThreadFunc,                  // thread function 
    
            &dwThrdParam,                // argument to thread function 
            0,                           // use default creation flags 
            &dwThreadId);                // returns the thread identifier 
     
       // Check the return value for success. 
     
       if (hThread == NULL) 
          ErrorExit( "CreateThread failed." ); 
    
       CloseHandle( hThread );
    }
    from the win32.hlp..
    and please do notice the VOID main()

    /btq
    ...viewlexx - julie lexx

  3. #3
    Registered User sbasak's Avatar
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    what files to include, it's giving error even after #include<windows.h>

    why VOID anyway? how it differs from void?

  4. #4
    btq
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    julie lexx... btq's Avatar
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    you should have
    #include <windows.h>
    #include <conio.h>
    in there, sorry bout that..

    /btq
    ...viewlexx - julie lexx

  5. #5
    Registered User sbasak's Avatar
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    still error

    In Visual C++ 5 it says

    illegal indirection in line wsprintf( szMsg, "ThreadFunc: Parameter = %d\n", *lpParam );

    and

    ErrorExit -> undeclared identifier

  6. #6
    btq
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    julie lexx... btq's Avatar
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    well,for simplicity,just get rid of them then, it's not as if they are the ones makin
    the threadin here

    just do somethin like:
    MessageBox( NULL, "hi I'm the thread", "Thread created.", MB_OK ); instead and exchange the Error-thingie with
    MessageBox( NULL, "something wrong with the hThread man!", "error.", MB_OK );

    see if that works..
    /btq
    ...viewlexx - julie lexx

  7. #7
    Registered User sbasak's Avatar
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    now it says linking error

    unresolved external symbol _WinMain@16

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