Test f() for multithreading

Here is a copy-paste template to test your code for multithreading. Let's say you want to test your function

int f() { ... }

for multithreading. Use this code to test f() running from number of threads simultaneously:

struct TESTPARAM
{
   int threadNo;
   LONG* m_pnCount;
};

DWORD WINAPI _msgTestThread(void* pParam)
{
   TESTPARAM* par = (TESTPARAM*)pParam;
   char buf[1014];

   int tmax = 1000;
   int tstep = 100;
   for (int t = 0; t<tmax; t+=tstep)
   {
      f();
      Sleep(tstep);
   }

   InterlockedDecrement(par->m_pnCount);
   delete par;
   return 0;
};

int Start()
{
   LONG nThreadCount = 0;
   int THREAD_MAX = 10;

   //msg::Message threads
   for (int i = 0; i<THREAD_MAX; i++)
   {
      //new, otherwise TESTPARAM will not reach thread in _msgTestThread,
      //and will be deleted on closing scope }
      TESTPARAM * par = new TESTPARAM;
      par->threadNo = i;
      par->m_pnCount = &nThreadCount;
      InterlockedIncrement(par->m_pnCount);
     
      DWORD dwThreadID = 0;
      CreateThread(0, 0, _msgTestThread, par, 0, &dwThreadID);
   }

   //Call window procedure until threads are finished
   while (nThreadCount > 0)
   {
      MSG msg;
      if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
      {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
      }
      Sleep(10);
   }
}