您必须通过两条消息发送它:
// 'p' is a pointer to your polygon
vertex *tmp = p->v;
p->v = NULL;
MPI_Send(p, sizeof(struct polygon), MPI_BYTES, dest, 1, ...);
MPI_Send(tmp, sizeof(struct vertex), MPI_BYTES, dest, 2, ...);
p->v = tmp;
在接收端,您只需通过两个步骤接收结构:
polygon p;
MPI_Recv(&p, sizeof(struct polygon), MPI_BYTES, src, 1, ...);
p.vertex = malloc(sizeof(struct vertex));
MPI_Recv(p.vertex, sizeof(struct vertex), MPI_BYTES, src, 2, ...);
显然这不是很好,所以如果你保持结构指针较少,这样你就可以立即发送它,这会更容易。