Parallel1.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   Parallel1.h
///@brief  Automatically instantiate several threads, with 1 argument
///
///@author Steve Parker
///        Department of Computer Science
///        University of Utah
///@date   June 2000
///

#ifndef Core_Thread_Parallel1_h
#define Core_Thread_Parallel1_h

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

namespace SCIRun {
/**************************************

@class
 Parallel1

 KEYWORDS
 Thread

@details
 Helper class to make instantiating threads to perform a parallel
 task easier.
   
****************************************/
template<class T, class Arg1> class Parallel1  : public ParallelBase {
public:
  //////////
  /// Create a Parallel1 object, using the specified member
  /// function instead of <i>Parallel1</i>.  This will
  /// typically be used like:
  /// <b><pre>Thread::Parallel1(Parallel1&lt;MyClass&gt;(this, &amp;MyClass::mymemberfn), nthreads);</pre></b>
  Parallel1(T* obj, void (T::*pmf)(int, Arg1), Arg1 a1);
        
  //////////
  /// Destroy the Parallel1 object - the threads will remain alive.
  virtual ~Parallel1();
  T* obj_;
  void (T::*pmf_)(int, Arg1);
  Arg1 a1;
protected:
  virtual void run(int proc);
private:
  // Cannot copy them
  Parallel1(const Parallel1&);
  Parallel1<T, Arg1>& operator=(const Parallel1<T, Arg1>&);
};

template<class T, class Arg1>
void
Parallel1<T, Arg1>::run(int proc)
{
    // Copy out do make sure that the call is atomic
    T* obj=obj_;
    void (T::*pmf)(int, Arg1) = pmf_;
    if(wait_)
    wait_->up();
    (obj->*pmf)(proc, a1);
    // Cannot do anything here, since the object may be deleted by the
    // time we return
}

template<class T, class Arg1>
Parallel1<T, Arg1>::Parallel1(T* obj,
                  void (T::*pmf)(int, Arg1),
                  Arg1 a1)
  : obj_(obj), pmf_(pmf), a1(a1)
{
  wait_=0; // This may be set by Thread::parallel
} // End namespace SCIRun

template<class T, class Arg1>
Parallel1<T, Arg1>::~Parallel1()
{
}

} // End namespace SCIRun

#endif