/******************************************************************************
Module name: Optex.h
Written by:  Jeffrey Richter
******************************************************************************/


#pragma once


///////////////////////////////////////////////////////////////////////////////


class COptex {
public:
   COptex(DWORD dwSpinCount = 4000);
   COptex(PCSTR  pszName, DWORD dwSpinCount = 4000);
   COptex(PCWSTR pszName, DWORD dwSpinCount = 4000);
   ~COptex();

   void SetSpinCount(DWORD dwSpinCount);
   void Enter();
   BOOL TryEnter();
   void Leave();
   BOOL IsSingleProcessOptex() const;

private:
   typedef struct {
      DWORD m_dwSpinCount;
      long  m_lLockCount;
      DWORD m_dwThreadId;
      long  m_lRecurseCount;
   } SHAREDINFO, *PSHAREDINFO;

   HANDLE      m_hevt;
   HANDLE      m_hfm;
   PSHAREDINFO m_psi;

private:
   static BOOL sm_fUniprocessorHost;

private:
   void CommonConstructor(DWORD dwSpinCount, BOOL fUnicode, PVOID pszName);
   PSTR ConstructObjectName(PSTR pszResult, 
      PCSTR pszPrefix, BOOL fUnicode, PVOID pszName);
};


///////////////////////////////////////////////////////////////////////////////

inline COptex::COptex(DWORD dwSpinCount) {

   CommonConstructor(dwSpinCount, FALSE, NULL);
}

///////////////////////////////////////////////////////////////////////////////


inline COptex::COptex(PCSTR pszName, DWORD dwSpinCount) {

   CommonConstructor(dwSpinCount, FALSE, (PVOID) pszName);
}


///////////////////////////////////////////////////////////////////////////////


inline COptex::COptex(PCWSTR pszName, DWORD dwSpinCount) {

   CommonConstructor(dwSpinCount, TRUE, (PVOID) pszName);
}


///////////////////////////////////////////////////////////////////////////////


inline COptex::IsSingleProcessOptex() const {

   return(m_hfm == NULL);
}


///////////////////////////////// End of File /////////////////////////////////