144 строки
4.5 KiB
C
144 строки
4.5 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; -*- */
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/*
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* $Id: read_sh.c,v 1.7 2002/10/24 15:54:43 gropp Exp $
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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_shared = PMPI_File_read_shared
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#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
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#pragma _HP_SECONDARY_DEF PMPI_File_read_shared MPI_File_read_shared
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#elif defined(HAVE_PRAGMA_CRI_DUP)
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#pragma _CRI duplicate MPI_File_read_shared as PMPI_File_read_shared
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/* end of weak pragmas */
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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_shared - 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_shared(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, bufsize, buftype_is_contig, filetype_is_contig;
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#ifndef PRINT_ERR_MSG
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static char myname[] = "MPI_FILE_READ_SHARED";
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#endif
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int datatype_size, incr;
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ADIO_Offset off, shared_fp;
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#ifdef PRINT_ERR_MSG
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if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
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FPRINTF(stderr, "MPI_File_read_shared: Invalid file handle\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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#else
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ADIOI_TEST_FILE_HANDLE(fh, myname);
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#endif
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if (count < 0) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_read_shared: Invalid count argument\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_COUNT_ARG,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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if (datatype == MPI_DATATYPE_NULL) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_read_shared: Invalid datatype\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_TYPE, MPIR_ERR_TYPE_NULL,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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MPI_Type_size(datatype, &datatype_size);
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if (count*datatype_size == 0) return MPI_SUCCESS;
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if ((count*datatype_size) % fh->etype_size != 0) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_read_shared: Only an integral number of etypes can be accessed\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_ETYPE_FRACTIONAL,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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if ((fh->file_system == ADIO_PIOFS) || (fh->file_system == ADIO_PVFS)) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_read_shared: Shared file pointer not supported on PIOFS and PVFS\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_OPERATION,
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MPIR_ERR_NO_SHARED_FP, myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
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ADIOI_Datatype_iscontig(fh->filetype, &filetype_is_contig);
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incr = (count*datatype_size)/fh->etype_size;
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ADIO_Get_shared_fp(fh, incr, &shared_fp, &error_code);
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if (error_code != MPI_SUCCESS) {
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FPRINTF(stderr, "MPI_File_read_shared: Error! Could not access shared file pointer.\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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/* contiguous or strided? */
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if (buftype_is_contig && filetype_is_contig) {
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/* convert count and shared_fp to bytes */
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bufsize = datatype_size * count;
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off = fh->disp + fh->etype_size * shared_fp;
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/* if atomic mode requested, lock (exclusive) the region, because there
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could be a concurrent noncontiguous request. On NFS, locking
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is done in the ADIO_ReadContig.*/
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if ((fh->atomicity) && (fh->file_system != ADIO_NFS))
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ADIOI_WRITE_LOCK(fh, off, SEEK_SET, bufsize);
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ADIO_ReadContig(fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
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off, status, &error_code);
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if ((fh->atomicity) && (fh->file_system != ADIO_NFS))
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ADIOI_UNLOCK(fh, off, SEEK_SET, bufsize);
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}
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else ADIO_ReadStrided(fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,
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shared_fp, status, &error_code);
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/* For strided and atomic mode, locking is done in ADIO_ReadStrided */
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return error_code;
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}
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