WaitingTaskList.h

Go to the documentation of this file.

#ifndef FWCore_Concurrency_WaitingTaskList_h
#define FWCore_Concurrency_WaitingTaskList_h
// -*- C++ -*-
//
// Package:     Concurrency
// Class  :     WaitingTaskList
// 
//
// Original Author:  Chris Jones
//         Created:  Thu Feb 21 13:46:31 CST 2013
// $Id$
//

// system include files
#include <atomic>

// user include files

// forward declarations
namespace tbb {
   class task;
}

namespace edm {
   class WaitingTaskList
   {
      
   public:

      WaitingTaskList(unsigned int iInitialSize = 2);
      ~WaitingTaskList();
      
      // ---------- member functions ---------------------------
      

      void add(tbb::task*);
      

      void doneWaiting();
      

      void reset();
      
   private:
      WaitingTaskList(const WaitingTaskList&) = delete; // stop default
      const WaitingTaskList& operator=(const WaitingTaskList&) = delete; // stop default
      
      void announce();
      
      struct WaitNode {
         tbb::task* m_task;
         std::atomic<WaitNode*> m_next;
         bool m_fromCache;
         
         void setNextNode(WaitNode* iNext){
            m_next = iNext;
         }
         
         WaitNode* nextNode() const {
            return m_next;
         }
      };
      
      WaitNode* createNode(tbb::task* iTask);
      
      
      // ---------- member data --------------------------------
      std::atomic<WaitNode*> m_head;
      WaitNode* m_nodeCache;
      unsigned int m_nodeCacheSize;
      std::atomic<unsigned int> m_lastAssignedCacheIndex;
      std::atomic<bool> m_waiting;    
   };
}

#endif