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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
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*
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* Copyright (C) 1997 University of Chicago.
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* See COPYRIGHT notice in top-level directory.
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*/
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#include "mpioimpl.h"
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#ifdef HAVE_WEAK_SYMBOLS
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#if defined(HAVE_PRAGMA_WEAK)
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#pragma weak MPI_File_read_ordered = PMPI_File_read_ordered
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#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
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#pragma _HP_SECONDARY_DEF PMPI_File_read_ordered MPI_File_read_ordered
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#elif defined(HAVE_PRAGMA_CRI_DUP)
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#pragma _CRI duplicate MPI_File_read_ordered as PMPI_File_read_ordered
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/* end of weak pragmas */
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#elif defined(HAVE_WEAK_ATTRIBUTE)
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int MPI_File_read_ordered(MPI_File fh, void *buf, int count, MPI_Datatype datatype,
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MPI_Status * status)
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__attribute__ ((weak, alias("PMPI_File_read_ordered")));
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#endif
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/* Include mapping from MPI->PMPI */
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#define MPIO_BUILD_PROFILING
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#include "mpioprof.h"
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#endif
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/* status object not filled currently */
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/*@
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MPI_File_read_ordered - Collective read using shared file pointer
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Input Parameters:
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. fh - file handle (handle)
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. count - number of elements in buffer (nonnegative integer)
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. datatype - datatype of each buffer element (handle)
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Output Parameters:
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. buf - initial address of buffer (choice)
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. status - status object (Status)
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.N fortran
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@*/
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int MPI_File_read_ordered(MPI_File fh, void *buf, int count,
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MPI_Datatype datatype, MPI_Status * status)
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{
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int error_code, nprocs, myrank;
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ADIO_Offset incr;
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MPI_Count datatype_size;
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int source, dest;
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static char myname[] = "MPI_FILE_READ_ORDERED";
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ADIO_Offset shared_fp = 0;
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ADIO_File adio_fh;
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ROMIO_THREAD_CS_ENTER();
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adio_fh = MPIO_File_resolve(fh);
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/* --BEGIN ERROR HANDLING-- */
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MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
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MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
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MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
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/* --END ERROR HANDLING-- */
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MPI_Type_size_x(datatype, &datatype_size);
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/* --BEGIN ERROR HANDLING-- */
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MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
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MPIO_CHECK_FS_SUPPORTS_SHARED(adio_fh, myname, error_code);
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MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
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/* --END ERROR HANDLING-- */
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ADIOI_TEST_DEFERRED(adio_fh, "MPI_File_read_ordered", &error_code);
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MPI_Comm_size(adio_fh->comm, &nprocs);
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MPI_Comm_rank(adio_fh->comm, &myrank);
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incr = (count * datatype_size) / adio_fh->etype_size;
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/* Use a message as a 'token' to order the operations */
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source = myrank - 1;
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dest = myrank + 1;
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if (source < 0)
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source = MPI_PROC_NULL;
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if (dest >= nprocs)
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dest = MPI_PROC_NULL;
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MPI_Recv(NULL, 0, MPI_BYTE, source, 0, adio_fh->comm, MPI_STATUS_IGNORE);
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ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);
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/* --BEGIN ERROR HANDLING-- */
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if (error_code != MPI_SUCCESS) {
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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goto fn_exit;
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}
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/* --END ERROR HANDLING-- */
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MPI_Send(NULL, 0, MPI_BYTE, dest, 0, adio_fh->comm);
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ADIO_ReadStridedColl(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
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shared_fp, status, &error_code);
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/* --BEGIN ERROR HANDLING-- */
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if (error_code != MPI_SUCCESS)
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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/* --END ERROR HANDLING-- */
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fn_exit:
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ROMIO_THREAD_CS_EXIT();
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/* FIXME: Check for error code from ReadStridedColl? */
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return error_code;
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}
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