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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: isthrmain.c,v 6.6 2002/12/11 19:15:12 jsquyres Exp $
*
* Function: - see if this is the main MPI thread
* Accepts: - ptr to flag
* Returns: - MPI_SUCCESS or error code
*/
#include <stdio.h>
#include <mpi.h>
#include <mpisys.h>
#include <lammpithreads.h>
#include <blktype.h>
/*@
MPI_Is_thread_main - determine if the caller is the main thread
Output Parameter:
. pflag - true if calling thread is main thread, false otherwise
Description:
This function is mainly here for link-compatability. Since only the
'MPI_THREAD_SINGLE' level of thread concurrency is supported in
LAM/MPI, this function has limited usefulness. Future versions of
LAM/MPI will support multi-threaded user programs, in which case
'MPI_Init_thread' must be used to initialize MPI. Hence, programmers
can use this function now in order to program for future flexibility.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.seealso MPI_Init_thread(3), MPI_Query_thread(3)
.N WEB
@*/
int
MPI_Is_thread_main(int *pflag)
{
lam_setfunc(BLKMPIISTHREADMAIN);
/*
* Ensure we got a valid requested and pprovided
*/
if (pflag == NULL) {
return(lam_errfunc(MPI_COMM_WORLD, BLKMPIISTHREADMAIN,
lam_mkerr(MPI_ERR_ARG, EMPIINIT)));
}
/*
* Are we the main thread?
*/
if (lam_thread_self() == lam_mpi_main_thread)
*pflag = 1;
else
*pflag = 0;
lam_resetfunc(BLKMPIISTHREADMAIN);
return(MPI_SUCCESS);
}
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