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/*
* Copyright (c) 2001-2002 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: iprobe.c,v 6.12 2003/02/20 19:57:13 jsquyres Exp $
*
* Function: - non-blocking check of incoming messages
* - message is not received
* Accepts: - source rank
* - message tag
* - communicator
* - flag (out)
* - status (out)
* Returns: - MPI_SUCCESS or error code
*/
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
#include <mpitrace.h>
#include <lam-ssi-rpi.h>
#include <rpisys.h>
#include <terror.h>
/*@
MPI_Iprobe - Nonblocking test for a message
Input Parameters:
+ src - source rank, or 'MPI_ANY_SOURCE' (integer)
. tag - tag value or 'MPI_ANY_TAG' (integer)
- comm - communicator (handle)
Output Parameter:
+ flag - 1 if the message is ready to be received, 0 if it is not
(logical)
- stat - status object (Status), which may be the MPI constant
'MPI_STATUS_IGNORE'
Notes:
This function does not actually receive a message; it only indicates
that a message matching the signature specified is ready to be
received.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_COMM
.N MPI_ERR_TAG
.N MPI_ERR_RANK
.N ACK
@*/
int MPI_Iprobe(int src, int tag, MPI_Comm comm,
int *flag, MPI_Status *stat)
{
struct _req request_storage; /* request structure */
MPI_Request req; /* request */
int err; /* error code */
int fl_trace; /* do tracing? */
int r;
double startt = 0.0; /* start time */
lam_initerr_m();
lam_setfunc_m(BLKMPIIPROBE);
/*
* Check additional arguments.
*/
if (flag == 0) {
return(lam_errfunc(comm, BLKMPIIPROBE,
lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
if ((tag < 0 && tag != MPI_ANY_TAG) || tag > lam_mpi_max_tag) {
return(lam_errfunc(comm, BLKMPIIPROBE,
lam_mkerr(MPI_ERR_TAG, EINVAL)));
}
/*
* Handle the trivial case.
*/
if (src == MPI_PROC_NULL) {
if (stat != MPI_STATUS_IGNORE) {
stat->MPI_ERROR = MPI_SUCCESS;
stat->MPI_SOURCE = MPI_PROC_NULL;
stat->MPI_TAG = MPI_ANY_TAG;
stat->st_length = 0;
}
*flag = 1;
lam_resetfunc_m(BLKMPIIPROBE);
return(MPI_SUCCESS);
}
if ((fl_trace = LAM_TRACE_TOP())) startt = MPI_Wtime();
/*
* Advance the system to give the probe a better chance of success.
*/
_mpi_req_blkclr();
err = _mpi_req_advance();
if (err != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIIPROBE, err));
}
LAM_ZERO_ME(request_storage);
req = &request_storage;
err = _mpi_req_build((char *) 0, 0, MPI_BYTE, src, tag, comm,
LAM_RQIPROBE, &req);
if (err != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIIPROBE, err));
}
err = _mpi_req_start(req);
if (err != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIIPROBE, err));
}
r = RPI_IPROBE(req);
if (r < 0) {
return(lam_errfunc(comm, BLKMPIIPROBE,
lam_mkerr(MPI_ERR_INTERN, errno)));
}
err = _mpi_req_end(req);
if (err != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIIPROBE, err));
}
/*
* Copy the status info if synchronized.
*/
if (r == 1) {
*flag = 1;
if (stat != MPI_STATUS_IGNORE) {
*stat = req->rq_status;
}
} else {
*flag = 0;
}
err = _mpi_req_destroy(&req);
if (err != MPI_SUCCESS) {
return(lam_errfunc(comm, BLKMPIIPROBE, err));
}
/*
* Generate a run time trace.
*/
if (fl_trace) {
lam_tr_msg(TRTNOIO, startt, LAM_S2US(MPI_Wtime() - startt),
0, src, tag, comm, 0, 0, 0, 0, 0, LAM_RQIPROBE);
}
lam_resetfunc_m(BLKMPIIPROBE);
return(MPI_SUCCESS);
}
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