barrier.cpp

#include "mpi.h"
#include <vector>

int main(int argc, char **argv) {
	MPI_Init(&argc, &argv);

	int rank, size;
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	MPI_Comm_size(MPI_COMM_WORLD, &size);

	std::vector<int> data(10);
	if (rank == 1) {
		MPI_Recv(data.data(), data.size(), MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
		printf("data received from %d.\n", 0);
	}
	MPI_Barrier(MPI_COMM_WORLD);
	if (rank == 0) {
		MPI_Send(data.data(), data.size(), MPI_INT, 1, 0, MPI_COMM_WORLD);
		printf("data sent to %d.\n", 1);
	}

	MPI_Finalize();
	return 0;
}