if(USE_SHM_MUTEX)
  set(Caffe2_CONTRIB_SHMMUTEX_CPU_SRC
    "${CMAKE_CURRENT_SOURCE_DIR}/shm_mutex.cc"
    )

  set(Caffe2_CPU_SRCS ${Caffe2_CPU_SRCS} ${Caffe2_CONTRIB_SHMMUTEX_CPU_SRC} PARENT_SCOPE)
endif()