ConcurrencyFlags.h

Go to the documentation of this file.

/***********************************************************************************\
* (c) Copyright 1998-2026 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#pragma once
 
#include <cstddef>
 
#include <GaudiKernel/IInterface.h>
#include <GaudiKernel/Kernel.h>
 
class AthMpEvtLoopMgr;
 
namespace SG {
  class HiveMgrSvc;
}

 
namespace Gaudi {
 
  namespace Concurrency {
 
    class ConcurrencyManager;
 
    class ConcurrencyFlags {
 
      friend class ConcurrencyManager;
      friend class SG::HiveMgrSvc;    // ATLAS
      friend class ::AthMpEvtLoopMgr; // ATLAS
 
    public:
      static GAUDI_API std::size_t numThreads() { return n_threads; }

      static GAUDI_API std::size_t numConcurrentEvents() { return n_concEvts; }

      static GAUDI_API std::size_t numProcs() { return n_procs; }

      static GAUDI_API bool concurrent() { return ( n_threads || n_concEvts || n_procs ); }
 
    private:
      static GAUDI_API void setNumThreads( const std::size_t& nT ) { n_threads = nT; }
      static GAUDI_API void setNumConcEvents( const std::size_t& nE ) { n_concEvts = nE; }
      static GAUDI_API void setNumProcs( const std::size_t& nP ) { n_procs = nP; }
 
    private:
      static std::size_t n_threads;  // worker threads for MT
      static std::size_t n_concEvts; // concurrent events for MT
      static std::size_t n_procs;    // child processes for MP
    };

    class GAUDI_API ConcurrencyManager : virtual public IInterface {
    public:
      DeclareInterfaceID( ConcurrencyManager, 1, 0 );
 
    protected:
      static void setNumThreads( const std::size_t& nT ) { ConcurrencyFlags::setNumThreads( nT ); }

      static void setNumConcEvents( const std::size_t& nE ) { ConcurrencyFlags::setNumConcEvents( nE ); }

      static void setNumProcs( const std::size_t& nP ) { ConcurrencyFlags::setNumProcs( nP ); }
    };
 
  } // namespace Concurrency
} // namespace Gaudi