/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *   $Id: write_ordb.c,v 1.3 2003/03/25 22:41:05 nsanghvi Exp $    
 *
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

#include "mpioimpl.h"

#ifdef HAVE_WEAK_SYMBOLS

#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_File_write_ordered_begin = PMPI_File_write_ordered_begin
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_write_ordered_begin MPI_File_write_ordered_begin
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_write_ordered_begin as PMPI_File_write_ordered_begin
/* end of weak pragmas */
#endif

/* Include mapping from MPI->PMPI */
#define MPIO_BUILD_PROFILING
#include "mpioprof.h"
#endif

/*@
    MPI_File_write_ordered_begin - Begin a split collective write using shared file pointer

Input Parameters:
. fh - file handle (handle)
. count - number of elements in buffer (nonnegative integer)
. datatype - datatype of each buffer element (handle)

Output Parameters:
. buf - initial address of buffer (choice)

.N fortran
@*/
int MPI_File_write_ordered_begin(MPI_File fh, void *buf, int count, 
				 MPI_Datatype datatype)
{
    int error_code, datatype_size, nprocs, myrank, i, incr;
#ifndef PRINT_ERR_MSG
    static char myname[] = "MPI_FILE_WRITE_ORDERED_BEGIN";
#endif
    ADIO_Offset shared_fp;
    MPI_Status status;

#ifdef PRINT_ERR_MSG
    if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
	FPRINTF(stderr, "MPI_File_write_ordered_begin: Invalid file handle\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
    }
#else
    ADIOI_TEST_FILE_HANDLE(fh, myname);
#endif

    if (count < 0) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_write_ordered_begin: Invalid count argument\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_COUNT_ARG,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);
#endif
    }

    if (datatype == MPI_DATATYPE_NULL) {
#ifdef PRINT_ERR_MSG
        FPRINTF(stderr, "MPI_File_write_ordered_begin: Invalid datatype\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_TYPE, MPIR_ERR_TYPE_NULL,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if (fh->split_coll_count) {
#ifdef PRINT_ERR_MSG
        FPRINTF(stderr, "MPI_File_write_ordered_begin: Only one active split collective I/O operation allowed per file handle\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_MULTIPLE_SPLIT_COLL,
                              myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);
#endif
    }

    fh->split_coll_count = 1;

    MPI_Type_size(datatype, &datatype_size);
    if ((count*datatype_size) % fh->etype_size != 0) {
#ifdef PRINT_ERR_MSG
        FPRINTF(stderr, "MPI_File_write_ordered_begin: Only an integral number of etypes can be accessed\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_ETYPE_FRACTIONAL,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if ((fh->file_system == ADIO_PIOFS) || (fh->file_system == ADIO_PVFS)) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_write_ordered_begin: Shared file pointer not supported on PIOFS and PVFS\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_OPERATION, 
                    MPIR_ERR_NO_SHARED_FP, myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);
#endif
    }

    MPI_Comm_size(fh->comm, &nprocs);
    MPI_Comm_rank(fh->comm, &myrank);

    incr = (count*datatype_size)/fh->etype_size;
    for (i=0; i<nprocs; i++) {
	if (i == myrank) {
	    ADIO_Get_shared_fp(fh, incr, &shared_fp, &error_code);
	    if (error_code != MPI_SUCCESS) {
		FPRINTF(stderr, "MPI_File_write_ordered_begin: Error! Could not access shared file pointer.\n");
		MPI_Abort(MPI_COMM_WORLD, 1);
	    }
	}

	MPI_Barrier(fh->comm);
    }

    ADIO_WriteStridedColl(fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
			 shared_fp, &status, &error_code);

    return error_code;
}