RunnableTask.h

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// $Id: RunnableTask.h,v 1.1 2010/12/13 21:06:32 eml Exp $

#ifndef SZA_UTIL_RUNNABLETASK_H
#define SZA_UTIL_RUNNABLETASK_H

#include "carma/szautil/Runnable.h"

#include <iostream>

namespace sza {
  namespace util {

    class RunnableTask : public Runnable {
    public:

      RunnableTask(bool spawnThread) :
        Runnable(spawnThread, runFn)
        {
          // CAUTION: spawn() calls the startup function passed to
          // pthread_create() when the thread corresponding to this
          // object is created in Runnable().  This startup function
          // calls our static runFn() method, which in turn calls the
          // run() function of this object.  
          //
          // If we call spawn() in the constructor, there's no
          // guarantee that the virtual table for this object has been
          // constructed by the time run() is called, which means that
          // sometimes the call to run() will correctly call the
          // overloaded version in the inherited class, but sometimes
          // it will call the virtual base-class method below.
          //
          // Therefore, this construct is not safe as-is, and spawn()
          // should NOT be called here.  You should instead construct
          // the object in external code, then call spawn() on it
          // directly.

          //      spawn(this);

        }

      virtual ~RunnableTask() {};

      virtual void run() {
      };

      static RUN_FN(runFn) {
        RunnableTask* runnable = (RunnableTask*) arg;
        runnable->run();
        return 0;
      }

    }; // End class RunnableTask

  } // End namespace util
} // End namespace sza



#endif // End #ifndef SZA_UTIL_RUNNABLETASK_H