Function mpi::ffi::PMPI_Iallgather

pub unsafe extern fn PMPI_Iallgather(sendbuf: *const c_void,
                                     sendcount: c_int,
                                     sendtype: MPI_Datatype,
                                     recvbuf: *mut c_void,
                                     recvcount: c_int,
                                     recvtype: MPI_Datatype,
                                     comm: MPI_Comm,
                                     request: *mut MPI_Request)
                                     -> c_int