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C:/temp/src/j2k/QNX4/Train/Mutex.hpp

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#ifndef __J2K__Mutex_HPP__
#define __J2K__Mutex_HPP__

#include <j2k/Fred/QNX/System.hpp>

#define MUTEX_DATA_TYPE  125

class Mutex {
public:
  int Identification;             // Is it Mutex* kind of ptr ?

  int  isBlocked() {
      return blocked; 
  }

  void Block() { 
    blocked = 1; 
    buffer = current; 
  }

  void UnBlock() {
    current = buffer;
    blocked = 0;
  }

  void* Read() {
    return current; 
  }

  void  Write( void* p ) {
    if ( blocked ) {  
      buffer = p;
    } else {
      current = p;                    
    }
  }

  // Optimized Constructor
  Mutex(void* data) 
   : Identification( MUTEX_DATA_TYPE ),
     blocked( 0 ),
     current( data ),
     buffer(  data ) { }

private:
  int    blocked;
  void*  buffer;
  void*  current;
};

#endif 

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