Detecting Deadlocks in C++ Using a Locks Monitor

Listing 3 Demonstrating the use of the locks monitor

#include "locksWrapperMacros.h"


// globals
HANDLE g_hResource[2] = { NULL, NULL };

void f2()
{
  WaitForSingleObject(g_hResource[1], INFINITE);
  Sleep(100);
  WaitForSingleObject(g_hResource[0], INFINITE);
  ReleaseMutex(g_hResource[1]);
  ReleaseMutex(g_hResource[0]);
}

void f1()
{
  WaitForSingleObject(g_hResource[0], INFINITE);
  Sleep(100);
  WaitForSingleObject(g_hResource[1], INFINITE);
  ReleaseMutex(g_hResource[0]);
  ReleaseMutex(g_hResource[1]);
}


DWORD WINAPI Thread_1(LPVOID pParam)
{
  f1();	
  return 0;
};

DWORD WINAPI Thread_2(LPVOID pParam)
{
  f2();
  return 0;
};

void main()
{
  HRESULT hr = S_FALSE;
  // get ptr to the only instance of CLocksMonitorMgr
  CLocksMonitorMgr* pMgr = CLocksMonitorMgr::GetInstance();  
  HANDLE hThread[2] = { NULL, NULL };
  DWORD  dwThreadId = 0;
  // start  locks monitor via its manager
  pMgr->Start();

  for (int i = 0; i < 2; i++)
    g_hResource[i] = CreateMutex(NULL, FALSE, NULL);

  hThread[0] = CreateThread(NULL, 0, Thread_1, NULL, 0, &dwThreadId);
  hThread[1] = CreateThread(NULL, 0, Thread_2, NULL, 0, &dwThreadId);  

  WaitForMultipleObjects(2,hThread,TRUE,INFINITE);

  // stop locks monitor via its manager
  pMgr->Stop();
}