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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitest.h"
#include <stdio.h>
#ifdef HAVE_WINDOWS_H
#include <winsock2.h>
#include <ws2tcpip.h> /* socklen_t */
#else
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#endif
#include <string.h>
/*
static char MTEST_Descrip[] = "A simple test of Comm_join";
*/
#define COUNT 1024
int main(int argc, char *argv[])
{
int sendbuf[COUNT], recvbuf[COUNT], i;
int err = 0, rank, nprocs, errs = 0;
MPI_Comm intercomm;
int listenfd, connfd, port, namelen;
struct sockaddr_in cliaddr, servaddr;
struct hostent *h;
char hostname[MPI_MAX_PROCESSOR_NAME];
socklen_t len, clilen;
MTest_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (nprocs != 2) {
printf("Run this program with 2 processes\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
if (rank == 1) {
/* server */
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd < 0) {
printf("server cannot open socket\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = 0;
err = bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
if (err < 0) {
errs++;
printf("bind failed\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
len = sizeof(servaddr);
err = getsockname(listenfd, (struct sockaddr *) &servaddr, &len);
if (err < 0) {
errs++;
printf("getsockname failed\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
port = ntohs(servaddr.sin_port);
MPI_Get_processor_name(hostname, &namelen);
err = listen(listenfd, 5);
if (err < 0) {
errs++;
printf("listen failed\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
MPI_Send(hostname, namelen + 1, MPI_CHAR, 0, 0, MPI_COMM_WORLD);
MPI_Send(&port, 1, MPI_INT, 0, 1, MPI_COMM_WORLD);
MPI_Barrier(MPI_COMM_WORLD);
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr *) &cliaddr, &clilen);
if (connfd < 0) {
printf("accept failed\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
} else {
/* client */
MPI_Recv(hostname, MPI_MAX_PROCESSOR_NAME, MPI_CHAR, 1, 0,
MPI_COMM_WORLD, MPI_STATUS_IGNORE);
MPI_Recv(&port, 1, MPI_INT, 1, 1, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
MPI_Barrier(MPI_COMM_WORLD);
h = gethostbyname(hostname);
if (h == NULL) {
printf("gethostbyname failed\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
servaddr.sin_family = h->h_addrtype;
memcpy((char *) &servaddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
servaddr.sin_port = htons(port);
/* create socket */
connfd = socket(AF_INET, SOCK_STREAM, 0);
if (connfd < 0) {
printf("client cannot open socket\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* connect to server */
err = connect(connfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
if (err < 0) {
errs++;
printf("client cannot connect\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
}
MPI_Barrier(MPI_COMM_WORLD);
/* To improve reporting of problems about operations, we
* change the error handler to errors return */
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
err = MPI_Comm_join(connfd, &intercomm);
if (err) {
errs++;
printf("Error in MPI_Comm_join %d\n", err);
}
/* To improve reporting of problems about operations, we
* change the error handler to errors return */
MPI_Comm_set_errhandler(intercomm, MPI_ERRORS_RETURN);
for (i = 0; i < COUNT; i++) {
recvbuf[i] = -1;
sendbuf[i] = i + COUNT * rank;
}
err = MPI_Sendrecv(sendbuf, COUNT, MPI_INT, 0, 0, recvbuf, COUNT, MPI_INT,
0, 0, intercomm, MPI_STATUS_IGNORE);
if (err != MPI_SUCCESS) {
errs++;
printf("Error in MPI_Sendrecv on new communicator\n");
}
for (i = 0; i < COUNT; i++) {
if (recvbuf[i] != ((rank + 1) % 2) * COUNT + i)
errs++;
}
MPI_Barrier(MPI_COMM_WORLD);
err = MPI_Comm_disconnect(&intercomm);
if (err != MPI_SUCCESS) {
errs++;
printf("Error in MPI_Comm_disconnect\n");
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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