switch_lock.h

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// AUTOMATICALLY GENERATED -- DO NOT EDIT!         -*- c++ -*-

#ifndef switch_lock_h
#define switch_lock_h

//
// INTERFACE definition follows 
//


class Context;

class Switch_lock
{
  // Warning: This lock's member variables must not need a
  // constructor.  Switch_lock instances must assume
  // zero-initialization or be initialized using the initialize()
  // member function.
  // Reason: to avoid overwriting the lock in the thread-ctor
  Context *_lock_owner;

public:  
  // 
  // Switch_lock inlines 
  // 
  
  inline void initialize();
  
  inline Context * lock_owner() const;
  
  inline bool test() const;
  
  void lock();
  
  inline bool test_and_set();
  
  void clear();

private:  
  inline bool try_lock();
};

//
// IMPLEMENTATION includes follow (for use by inline functions)
//


#include "atomic.h"
#include "globals.h"

//
// IMPLEMENTATION of inline functions (and needed classes)
//



// 
// Switch_lock inlines 
// 

inline void
Switch_lock::initialize()
{
  _lock_owner = 0;
}


inline Context *
Switch_lock::lock_owner() const
{
  return _lock_owner;
}


inline bool 
Switch_lock::test() const
{
  return _lock_owner;
}


inline bool
Switch_lock::test_and_set()
{
  if (_lock_owner == current())
    return true;

  lock();

  return false;
}

#endif // switch_lock_h

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