Thread: Threading

this is a sample, can't remember where i got it -_-"
it use _beginthread() function which is included in C run-time libraries. you can get more details on msdn.

Code:

#include <windows.h>
#include <process.h>
#include <iostream>
using namespace std;

void Func1(void *);
void Func2(void *);

CRITICAL_SECTION Section;

int main()
{
    InitializeCriticalSection(&Section);

    _beginthread(Func1,
                 0,
                 NULL);
    _beginthread(Func2,
                 0,
                 NULL);

    Sleep(10000);

    DeleteCriticalSection(&Section);

    cout << "Main exit" << endl;

    return 0;
}

void Func1(void *P)
{
    int Count;

    for (Count = 1; Count < 11; Count++)
    {
        EnterCriticalSection(&Section);
        cout << "Func1 loop " << Count << endl;
        LeaveCriticalSection(&Section);
    }
    return;
}

void Func2(void *P)
{
    int Count;

    for (Count = 10; Count > 0; Count--)
    {
        EnterCriticalSection(&Section);
        cout << "Func2 loop " << Count << endl;
        LeaveCriticalSection(&Section);
    }
    return;
}




int main()
{
    HANDLE hThreads[2];

    InitializeCriticalSection(&Section);

    hThreads[0] = (HANDLE)_beginthread(Func1,
                                       0,
                                       NULL);

    hThreads[1] = (HANDLE)_beginthread(Func2,
                                       0,
                                       NULL);

    WaitForMultipleObjects(2,
                           hThreads,
                           TRUE,
                           INFINITE);

    DeleteCriticalSection(&Section);

    cout << "Main exit" << endl;

    return 0;
}

It looks like a mistake. They are just two different ways to handle things. The first main() is sleeping for 10 seconds and assuming that both threads have exited by the time the wait expires. The second main() is getting a handle to each thread, and explicitly waiting for both threads to exit before continuing. Take your pick and comment the other one out. As far as the linker not finding _beginthread, you need to compile with /MT. Since you have visual studio 2003, why not click on help->index, type in _beginthread, and look at the example code that they give you for free. Just a thought.