SetThreadAffinityMask() not work???

#include <windows.h>
#include <stdio.h>
#define MAX_SEM_COUNT 10
#define THREADCOUNT 12
HANDLE ghSemaphore;
DWORD WINAPI ThreadProc( LPVOID );
void main()
{
    HANDLE aThread[THREADCOUNT];
    DWORD ThreadID;
    int i;
    // Create a semaphore with initial and max counts of MAX_SEM_COUNT
    ghSemaphore = CreateSemaphore( 
        NULL,           // default security attributes
        MAX_SEM_COUNT,  // initial count
        MAX_SEM_COUNT,  // maximum count
        NULL);          // unnamed semaphore
    if (ghSemaphore == NULL) 
    {
        printf("CreateSemaphore error: %d\n", GetLastError());
        return;
    }
    // Create worker threads
    for( i=0; i < THREADCOUNT; i++ )
    {
        aThread[i] = CreateThread( 
                     NULL,       // default security attributes
                     0,          // default stack size
                     (LPTHREAD_START_ROUTINE) ThreadProc, 
                     NULL,       // no thread function arguments
                     CREATE_SUSPENDED,          // default creation flags
                     &ThreadID); // receive thread identifier
		
        if( aThread[i] == NULL )
        {
            printf("CreateThread error: %d\n", GetLastError());
            return;
        }
		SetThreadAffinityMask(aThread[i],0x00000001);
		ResumeThread(aThread[i]);		
    }	
    // Wait for all threads to terminate
	
    WaitForMultipleObjects(THREADCOUNT, aThread, TRUE, INFINITE);
	
    // Close thread and semaphore handles
	
    for( i=0; i < THREADCOUNT; i++ )
        CloseHandle(aThread[i]);
	
    CloseHandle(ghSemaphore);
	system("pause");
}
DWORD WINAPI ThreadProc( LPVOID lpParam )
{
//	SetThreadAffinityMask(GetCurrentThread(),0x1);
    DWORD dwWaitResult; 
    BOOL bContinue=TRUE;
	
    while(bContinue)
    {
        // Try to enter the semaphore gate.
		
        dwWaitResult = WaitForSingleObject( 
            ghSemaphore,   // handle to semaphore
            0L);           // zero-second time-out interval
		
        switch (dwWaitResult) 
        { 
            // The semaphore object was signaled.
		case WAIT_OBJECT_0: 
			// TODO: Perform task
			printf("Thread %d: wait succeeded\n", GetCurrentThreadId());
			bContinue=FALSE;            
			
			// Simulate thread spending time on task
			Sleep(5);
			
			// Relase the semaphore when task is finished
			
			if (!ReleaseSemaphore( 
				ghSemaphore,  // handle to semaphore
				1,            // increase count by one
				NULL) )       // not interested in previous count
			{
				printf("ReleaseSemaphore error: %d\n", GetLastError());
			}
			break; 
			
            // The semaphore was nonsignaled, so a time-out occurred.
		case WAIT_TIMEOUT: 
			printf("Thread %d: wait timed out\n", GetCurrentThreadId());
			break; 
        }
    }
    return TRUE;
}