Mutex.h

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// -*- C++ -*-
#ifndef COIL_MUTEX_H
#define COIL_MUTEX_H

#include <windows.h>

namespace coil
{
  typedef HANDLE pthread_mutex_t;
  
  class Mutex
  {
  public:
    Mutex(const char * const name = 0)
    {
        SECURITY_DESCRIPTOR sd_buffer;
        ::InitializeSecurityDescriptor(&sd_buffer, 
                                       SECURITY_DESCRIPTOR_REVISION);
        ::SetSecurityDescriptorDacl (&sd_buffer, TRUE, 0, FALSE);
                m_Security_attr.nLength = sizeof(SECURITY_ATTRIBUTES);
                m_Security_attr.lpSecurityDescriptor = &sd_buffer;
                m_Security_attr.bInheritHandle = TRUE;
                mutex_ = ::CreateMutexA( &m_Security_attr,
                                         FALSE,
                                         name );


    }

    ~Mutex()
    {
                ::CloseHandle(mutex_);
                
    }

    inline void lock()
    {
                ::WaitForSingleObject(mutex_,INFINITE);
    }

    inline bool trylock()
    {
        unsigned long dwret;
                dwret = ::WaitForSingleObject(mutex_,0);
        switch(dwret)
                {
                  case WAIT_ABANDONED:
                          return true;
                          break;
                  case WAIT_OBJECT_0:
                          return false;
                  case WAIT_TIMEOUT:
                          return true;
                  default:
                          return true;
                }
    }

    inline void unlock()
    {
                ::ReleaseMutex(mutex_);
    }
    HANDLE mutex_;
    
  private:
    SECURITY_ATTRIBUTES m_Security_attr;

        Mutex(const Mutex&);
    Mutex& operator=(const Mutex &);
  };
};
#endif // COIL_MUTEX_H