[VC++] Thread 만들기 예제

매번 스레드를 사용할려고 인터넷 뒤지는거 귀찮다.

예전에 홈페이지에 만들어두었던 스레드 예제가 지금은 너무 아쉽네

그래서 여기에 다시 하나 만들어서.. 활용하자!!!!

#include <windows.h>
#include <strsafe.h>

#define MAX_THREADS 3
#define BUF_SIZE 255

typedef struct _MyData {
    int val1;
    int val2;
} MYDATA, *PMYDATA;

DWORD WINAPI ThreadProc( LPVOID lpParam ) 
{ 
    HANDLE hStdout;
    PMYDATA pData;

    TCHAR msgBuf[BUF_SIZE];
    size_t cchStringSize;
    DWORD dwChars;

    hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    if( hStdout == INVALID_HANDLE_VALUE )
        return 1;

    // Cast the parameter to the correct data type.

    pData = (PMYDATA)lpParam;

    // Print the parameter values using thread-safe functions.

    StringCchPrintf(msgBuf, BUF_SIZE, TEXT("Parameters = %d, %d\n"), 
        pData->val1, pData->val2); 
    StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
    WriteConsole(hStdout, msgBuf, cchStringSize, &dwChars, NULL);

    // Free the memory allocated by the caller for the thread 
    // data structure.

    HeapFree(GetProcessHeap(), 0, pData);

    return 0; 
} 
 
void main()
{
    PMYDATA pData;
    DWORD dwThreadId[MAX_THREADS];
    HANDLE hThread[MAX_THREADS]; 
    int i;

    // Create MAX_THREADS worker threads.

    for( i=0; i<MAX_THREADS; i++ )
    {
        // Allocate memory for thread data.

        pData = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
                sizeof(MYDATA));

        if( pData == NULL )
            ExitProcess(2);

        // Generate unique data for each thread.

        pData->val1 = i;
        pData->val2 = i+100;

        hThread[i] = CreateThread( 
            NULL,              // default security attributes
            0,                 // use default stack size  
            ThreadProc,        // thread function 
            pData,             // argument to thread function 
            0,                 // use default creation flags 
            &dwThreadId[i]);   // returns the thread identifier 
 
        // Check the return value for success. 
 
        if (hThread[i] == NULL) 
        {
            ExitProcess(i);
        }
    }

    // Wait until all threads have terminated.

    WaitForMultipleObjects(MAX_THREADS, hThread, TRUE, INFINITE);

    // Close all thread handles upon completion.

    for(i=0; i<MAX_THREADS; i++)
    {
        CloseHandle(hThread[i]);
    }
}