如何在MPI中为多个进程创建结构

#include <stdio.h>
#include <mpi.h>

typedef struct {
    int id;
    double value;
} Data;

int main(int argc, char** argv) {
    int rank, size;
    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPI_Comm_size(MPI_COMM_WORLD, &size);

    // 定义结构体
    Data data;
    data.id = rank;
    data.value = 3.14 * rank;

    // 创建自定义数据类型
    MPI_Datatype datatype;
    int blocklengths[2] = {1, 1};
    MPI_Aint displacements[2] = {offsetof(Data, id), offsetof(Data, value)};
    MPI_Datatype types[2] = {MPI_INT, MPI_DOUBLE};
    MPI_Type_create_struct(2, blocklengths, displacements, types, &datatype);
    MPI_Type_commit(&datatype);

    if (rank == 0) {
        // 进程0发送结构体数据给其他进程
        for (int i = 1; i < size; i++) {
            MPI_Send(&data, 1, datatype, i, 0, MPI_COMM_WORLD);
        }
    } else {
        // 其他进程接收进程0发送的结构体数据
        MPI_Recv(&data, 1, datatype, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
        printf("Received data: id = %d, value = %f\n", data.id, data.value);
    }

    // 注销自定义数据类型
    MPI_Type_free(&datatype);

    MPI_Finalize();
    return 0;
}