Parallel2.h

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/*
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   Copyright (c) 2009 Scientific Computing and Imaging Institute,
   University of Utah.

   
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///
///@file   Parallel2.h
///@brief  Automatically instantiate several threads, with 2 arguments
///
///@author Steve Parker
///        Department of Computer Science
///        University of Utah
///@date   June 2000
///

#ifndef Core_Thread_Parallel2_h
#define Core_Thread_Parallel2_h

#include <Core/Thread/Legacy/ParallelBase.h>
#include <Core/Thread/Legacy/Semaphore.h>

namespace SCIRun {
/**************************************
 
@class
 Parallel2

 KEYWORDS
 Thread

@details
 Helper class to make instantiating threads to perform a parallel
 task easier.
   
****************************************/
template<class T, class Arg1, class Arg2> class Parallel2  : public ParallelBase {
public:
  //////////
  /// Create a Parallel2 object, using the specified member
  /// function instead of <i>Parallel2</i>.  This will
  /// typically be used like:
  /// <b><pre>Thread::Parallel2(Parallel2&lt;MyClass&gt;(this, &amp;MyClass::mymemberfn), nthreads);</pre></b>
  Parallel2(T* obj, void (T::*pmf)(int, Arg1, Arg2), Arg1 a1, Arg2 a2);
        
  //////////
  /// Destroy the Parallel2 object - the threads will remain alive.
  virtual ~Parallel2();
  T* obj_;
  void (T::*pmf_)(int, Arg1, Arg2);
  Arg1 a1;
  Arg2 a2;
protected:
  virtual void run(int proc);
private:
  /// Cannot copy them
  Parallel2(const Parallel2&);
  Parallel2<T, Arg1, Arg2>& operator=(const Parallel2<T, Arg1, Arg2>&);
};

template<class T, class Arg1, class Arg2>
void
Parallel2<T, Arg1, Arg2>::run(int proc)
{
    // Copy out do make sure that the call is atomic
    T* obj=obj_;
    void (T::*pmf)(int, Arg1, Arg2) = pmf_;
    if(wait_)
    wait_->up();
    (obj->*pmf)(proc, a1, a2);
    // Cannot do anything here, since the object may be deleted by the
    // time we return
}

template<class T, class Arg1, class Arg2>
Parallel2<T, Arg1, Arg2>::Parallel2(T* obj,
                             void (T::*pmf)(int, Arg1, Arg2),
                             Arg1 a1, Arg2 a2)
    : obj_(obj), pmf_(pmf), a1(a1), a2(a2)
{
    wait_=0; // This may be set by Thread::parallel
} // End namespace SCIRun

template<class T, class Arg1, class Arg2>
Parallel2<T, Arg1, Arg2>::~Parallel2()
{
}

} //End namespace SCIRun
#endif