#include <mpi.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
int main(int argc, char *argv[]) {
	int rank, nodes;
	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);
	MPI_Comm_size(MPI_COMM_WORLD,&nodes);
	printf("I'm %d/%d %d\n", rank, nodes, getpid());
	int ret;
	MPI_Status status;
	MPI_Request req1, req2;
	char c = 0;

	if (rank == 0) {
		MPI_Isend(&c, 1, MPI_CHAR, 1, 0, MPI_COMM_WORLD, &req1);
		MPI_Isend(&c, 1, MPI_CHAR, 2, 0, MPI_COMM_WORLD, &req2);
		MPI_Wait(&req1, &status);
		MPI_Wait(&req2, &status);
	} else {
		MPI_Recv(&c, 1, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &status);
	}

	MPI_Finalize();
	return 0;
}