TImplicitMT.cxx

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// @(#)root/thread:$Id$
// // Author: Enric Tejedor Saavedra   03/12/15
//
/*************************************************************************
 * Copyright (C) 1995-2015, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TImplicitMT                                                          //
//                                                                      //
// This file implements the methods to enable, disable and check the    //
// status of the global implicit multi-threading in ROOT.               //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TError.h"
#include "TThread.h"

#include "tbb/task_scheduler_init.h"


static tbb::task_scheduler_init &GetScheduler()
{
   static tbb::task_scheduler_init scheduler(tbb::task_scheduler_init::deferred);
   return scheduler;
}

extern "C" void ROOT_TImplicitMT_EnableImplicitMT(UInt_t numthreads)
{
   if (!GetScheduler().is_active()) {
      TThread::Initialize();

      if (numthreads == 0)
         numthreads = tbb::task_scheduler_init::automatic;

      GetScheduler().initialize(numthreads);
   }
   else {
      ::Warning("ROOT_TImplicitMT_EnableImplicitMT", "Implicit multi-threading is already enabled");
   }
};

extern "C" void ROOT_TImplicitMT_DisableImplicitMT()
{
   if (GetScheduler().is_active()) {
      GetScheduler().terminate();
   }
   else {
      ::Warning("ROOT_TImplicitMT_DisableImplicitMT", "Implicit multi-threading is already disabled");
   }
};

extern "C" bool ROOT_TImplicitMT_IsImplicitMTEnabled()
{
   return GetScheduler().is_active();
};