mpi::ffi

Function PMPI_Allreduce

Source 
pub unsafe extern "C" fn PMPI_Allreduce(
    sendbuf: *const c_void,
    recvbuf: *mut c_void,
    count: i32,
    datatype: *mut ompi_datatype_t,
    op: *mut ompi_op_t,
    comm: *mut ompi_communicator_t,
) -> i32