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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <errno.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/mca/dpm/dpm.h"
#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Comm_join = PMPI_Comm_join
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Comm_join";
static int ompi_socket_send (int fd, char *buf, int len );
static int ompi_socket_recv (int fd, char *buf, int len );
int MPI_Comm_join(int fd, MPI_Comm *intercomm)
{
int rc;
uint32_t len, rlen, llen, lrlen;
int send_first=1;
char *rport;
ompi_communicator_t *newcomp;
char port_name[MPI_MAX_PORT_NAME];
if ( MPI_PARAM_CHECK ) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if ( NULL == intercomm ) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
FUNC_NAME);
}
}
OPAL_CR_ENTER_LIBRARY();
/* open a port using the specified tag */
if (OMPI_SUCCESS != (rc = ompi_dpm.open_port(port_name, OMPI_COMM_JOIN_TAG))) {
OPAL_CR_EXIT_LIBRARY();
return rc;
}
/* sendrecv port-name through the socket connection.
Need to determine somehow how to avoid a potential deadlock
here. */
llen = (uint32_t)(strlen(port_name)+1);
len = htonl(llen);
ompi_socket_send( fd, (char *) &len, sizeof(uint32_t));
ompi_socket_recv (fd, (char *) &rlen, sizeof(uint32_t));
lrlen = ntohl(rlen);
rport = (char *) malloc (lrlen);
if ( NULL == rport ) {
*intercomm = MPI_COMM_NULL;
OPAL_CR_EXIT_LIBRARY();
return MPI_ERR_INTERN;
}
/* Assumption: socket_send should not block, even if the socket
is not configured to be non-blocking, because the message length are
so short. */
ompi_socket_send (fd, port_name, llen);
ompi_socket_recv (fd, rport, lrlen);
/* use the port we received to connect/accept */
rc = ompi_dpm.connect_accept (MPI_COMM_SELF, 0, rport, send_first, &newcomp);
free ( rport );
*intercomm = newcomp;
OMPI_ERRHANDLER_RETURN (rc, MPI_COMM_SELF, rc, FUNC_NAME);
}
static int ompi_socket_send (int fd, char *buf, int len )
{
int num;
size_t s_num;
ssize_t a;
char *c_ptr;
int ret = OMPI_SUCCESS;
num = len;
c_ptr = buf;
do {
s_num = (size_t) num;
a = write ( fd, c_ptr, s_num );
if ( a == -1 ) {
if ( errno == EINTR ) {
/* Catch EINTR on, mainly on IBM RS6000 */
continue;
}
#ifdef __SR8000
else if ( errno == EWOULDBLOCK ) {
/*Catch EWOULDBLOCK on Hitachi SR8000 */
continue;
}
else if ( errno == EAGAIN ) {
/* Catch EAGAIN on Hitachi SR8000 */
continue;
}
#endif
else {
/* Another error occured */
fprintf (stderr,"ompi_socket_send: error while writing to socket"
" error:%s", strerror (errno) );
return MPI_ERR_OTHER;
}
}
num -= a;
c_ptr += a;
} while ( num > 0 );
if ( num < 0 ) {
fprintf (stderr, "ompi_socket_send: more data written then available");
ret = MPI_ERR_INTERN;
}
return ret;
}
static int ompi_socket_recv (int fd, char *buf, int len )
{
int num;
size_t s_num;
ssize_t a;
char *c_ptr;
int ret = MPI_SUCCESS;
num = len;
c_ptr = buf;
do {
s_num = (size_t ) num;
a = read ( fd, c_ptr, s_num );
if ( a == -1 ) {
if ( errno == EINTR ) {
/* Catch EINTR on, mainly on IBM RS6000 */
continue;
}
#ifdef __SR8000
else if ( errno == EWOULDBLOCK ) {
/*Catch EWOULDBLOCK on Hitachi SR8000 */
continue;
}
else if ( errno == EAGAIN ) {
/* Catch EAGAIN on Hitachi SR8000 */
continue;
}
#endif
else {
/* Another error occured */
fprintf (stderr,"ompi_socket_recv: error while reading from socket"
" error:%s", strerror (errno) );
return MPI_ERR_OTHER;
}
}
num -= a;
c_ptr += a;
} while ( num > 0 );
if ( num < 0 ) {
fprintf (stderr, "ompi_socket_recv: more data read then available");
ret = MPI_ERR_INTERN;
}
return ret;
}
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