ConcurrencyFlags.h

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* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
#include <cstddef>
 
#include <GaudiKernel/Kernel.h>
 
class ThreadPoolSvc;
class HiveWhiteBoard;
class SGHiveMgrSvc;
class AthMpEvtLoopMgr;
class EvtStoreSvc;

 
namespace SG {
  class HiveMgrSvc;
}
 
namespace Gaudi {
 
  namespace Concurrency {
 
    class ConcurrencyFlags {
 
      friend class ::ThreadPoolSvc;
      friend class ::HiveWhiteBoard;
      friend class ::EvtStoreSvc;
      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
    };
  } // namespace Concurrency
} // namespace Gaudi