Function mpi::ffi::PMPI_Iallgatherv

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