C++ set processor affinity on Windows

 #include "stdafx.h"  
 #include <iostream>  
 #include <vector>  
 #include <mutex>  
 #include <windows.h>  
 using namespace std;  
 DWORD WINAPI threadProc(LPVOID p)  
 {  
      HANDLE process = GetCurrentProcess();  
      DWORD_PTR processAffinityMask = (1 << 1 | 1 << 2);  //use processor 1 and 2
      BOOL success = SetProcessAffinityMask(process, processAffinityMask);  
      clock_t t = clock() + 100; // consume 100ms ...  
      while (clock() < t) {}       // of CPU time  
      printf("thread %d:\tlogical CPU %d\tProcessId %d\n", (int)p, GetCurrentProcessorNumber(), GetCurrentProcessId());  
      return 0;  
 }  
 int main()  
 {  
      unsigned num_cpus = std::thread::hardware_concurrency();  //retrieve the number of processor
      std::cout << "Launching " << num_cpus << " threads\n";  
      for (int i = 0; i < num_cpus; i++)  
      {  
           HANDLE h = CreateThread(NULL, 0, threadProc, (LPVOID)i, 0, NULL);  
      }  
      getchar();  
   return 0;  
 }