isend_recv.cc
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	#include <assert.h>
	#include <iostream>
	#include <mpi.h>
	#include <vector>

	void fill_buffer(std::vector<int> &buf) {
	for (auto &v : buf) {
	v = 0;
	}
	}

	int main() {
	int rank, size;
	std::vector<int> buf(100);

	MPI_Init(NULL, NULL);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	MPI_Comm_size(MPI_COMM_WORLD, &size);

	assert(size == 2 && "Works only with 2 procs");

	MPI_Request request;
	if (rank == 0) {
	fill_buffer(buf);
	MPI_Isend(buf.data(), buf.size(), MPI_INT, 1, 0, MPI_COMM_WORLD, &request);
	} else if (rank == 1) {
	MPI_Recv(buf.data(), buf.size(), MPI_INT, 0, 0, MPI_COMM_WORLD,
	MPI_STATUS_IGNORE);
	}
	// here I can do computation as long as buf is not modified
	MPI_Wait(&request, MPI_STATUS_IGNORE);

	MPI_Finalize();

	return 0;
	}