Added send,receive functions

Makefile

@@ -1,11 +1,13 @@
 MPICC = mpicc
 CFLAGS += -g
-all: example example2 easysendrecv
+all: example example2 easysendrecv nonblockingsendrecv
 example: example.c
 	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
 example2: example2.c
 	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
 easysendrecv: easysendrecv.c
 	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
+nonblockingsendrecv: nonblockingsendrecv.c
+	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
 clean:
 	rm -f example example2

nonblockingsendrecv.c

@@ -0,0 +1,29 @@
+#include "mpi.h"
+#include <string.h>
+#include <stdio.h>
+int main(int argc, char **argv) {
+int a, b, size, rank, tag = 0;
+MPI_Status status;
+MPI_Request send_request, recv_request;
+MPI_Init(&argc, &argv);
+MPI_Comm_size(MPI_COMM_WORLD, &size);
+MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+if (rank == 0) {
+a = 314159;
+MPI_Isend(&a, 1, MPI_INT, 1, tag, MPI_COMM_WORLD, &send_request);
+MPI_Irecv (&b, 1, MPI_INT, 1, tag, MPI_COMM_WORLD, &recv_request);
+MPI_Wait(&send_request, &status);
+MPI_Wait(&recv_request, &status);
+printf ("Process %d received value %d\n", rank, b);
+}
+else {
+a = 667;
+MPI_Isend (&a, 1, MPI_INT, 0, tag, MPI_COMM_WORLD, &send_request);
+MPI_Irecv (&b, 1, MPI_INT, 0, tag, MPI_COMM_WORLD, &recv_request);
+MPI_Wait(&send_request, &status);
+MPI_Wait(&recv_request, &status);
+printf ("Process %d received value %d\n", rank, b);
+}
+MPI_Finalize();
+return 0;
+}