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File indexing completed on 2025-09-16 08:52:44
0001 //------------------------------- -*- C++ -*- -------------------------------// 0002 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details 0003 // SPDX-License-Identifier: (Apache-2.0 OR MIT) 0004 //---------------------------------------------------------------------------// 0005 //! \file corecel/sys/detail/MpiCommunicatorImpl.hh 0006 //! \brief Type definitions for MPI parallel operations (MPI optional) 0007 //---------------------------------------------------------------------------// 0008 #pragma once 0009 0010 #include "corecel/Config.hh" 0011 0012 #if CELERITAS_USE_MPI 0013 # include <mpi.h> 0014 #endif 0015 0016 namespace celeritas 0017 { 0018 namespace detail 0019 { 0020 //---------------------------------------------------------------------------// 0021 #if CELERITAS_USE_MPI 0022 0023 //! Opaque MPI communicator 0024 using MpiComm = MPI_Comm; 0025 0026 #else 0027 0028 //!@{ 0029 //! Mock MPI communicator 0030 struct MpiComm 0031 { 0032 int value_; 0033 }; 0034 0035 constexpr inline bool operator==(MpiComm a, MpiComm b) 0036 { 0037 return a.value_ == b.value_; 0038 } 0039 0040 constexpr inline bool operator!=(MpiComm a, MpiComm b) 0041 { 0042 return !(a == b); 0043 } 0044 //!@} 0045 0046 #endif 0047 0048 //---------------------------------------------------------------------------// 0049 //! Used for invalid comm handles 0050 inline MpiComm mpi_comm_null() 0051 { 0052 #if CELERITAS_USE_MPI 0053 return MPI_COMM_NULL; 0054 #else 0055 return {0}; 0056 #endif 0057 } 0058 0059 //! Communicator for all processes 0060 inline MpiComm mpi_comm_world() 0061 { 0062 #if CELERITAS_USE_MPI 0063 return MPI_COMM_WORLD; 0064 #else 0065 return {1}; 0066 #endif 0067 } 0068 0069 //! Communicator with only the local process 0070 inline MpiComm mpi_comm_self() 0071 { 0072 #if CELERITAS_USE_MPI 0073 return MPI_COMM_SELF; 0074 #else 0075 return {-1}; 0076 #endif 0077 } 0078 0079 //---------------------------------------------------------------------------// 0080 } // namespace detail 0081 } // namespace celeritas
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