/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *   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_read = PMPI_File_read
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_read MPI_File_read
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_read as PMPI_File_read
/* end of weak pragmas */
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status * status)
    __attribute__ ((weak, alias("PMPI_File_read")));
#endif

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

/* status object not filled currently */

/*@
    MPI_File_read - Read using individual 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)
. status - status object (Status)

.N fortran
@*/
int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status * status)
{
    int error_code;
    static char myname[] = "MPI_FILE_READ";
#ifdef MPI_hpux
    int fl_xmpi;

    HPMP_IO_START(fl_xmpi, BLKMPIFILEREAD, TRDTBLOCK, fh, datatype, count);
#endif /* MPI_hpux */

    error_code = MPIOI_File_read(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL, buf,
                                 count, datatype, myname, status);

#ifdef MPI_hpux
    HPMP_IO_END(fl_xmpi, fh, datatype, count);
#endif /* MPI_hpux */

    return error_code;
}

/* prevent multiple definitions of this routine */
#ifdef MPIO_BUILD_PROFILING
int MPIOI_File_read(MPI_File fh,
                    MPI_Offset offset,
                    int file_ptr_type,
                    void *buf, int count, MPI_Datatype datatype, char *myname, MPI_Status * status)
{
    int error_code, buftype_is_contig, filetype_is_contig;
    MPI_Count datatype_size;
    ADIO_File adio_fh;
    ADIO_Offset off, bufsize;
    void *xbuf = NULL, *e32_buf = NULL;

    ROMIO_THREAD_CS_ENTER();

    adio_fh = MPIO_File_resolve(fh);

    /* --BEGIN ERROR HANDLING-- */
    MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
    MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
    MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);

    if (file_ptr_type == ADIO_EXPLICIT_OFFSET && offset < 0) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iobadoffset", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    /* --END ERROR HANDLING-- */

    MPI_Type_size_x(datatype, &datatype_size);

    /* --BEGIN ERROR HANDLING-- */
    MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
    /* --END ERROR HANDLING-- */

    if (count * datatype_size == 0) {
#ifdef HAVE_STATUS_SET_BYTES
        MPIR_Status_set_bytes(status, datatype, 0);
#endif
        error_code = MPI_SUCCESS;
        goto fn_exit;
    }

    /* --BEGIN ERROR HANDLING-- */
    MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
    MPIO_CHECK_READABLE(adio_fh, myname, error_code);
    MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
    /* --END ERROR HANDLING-- */

    ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
    ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);

    ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);

    xbuf = buf;
    if (adio_fh->is_external32) {
        MPI_Aint e32_size = 0;
        error_code = MPIU_datatype_full_size(datatype, &e32_size);
        if (error_code != MPI_SUCCESS)
            goto fn_exit;

        e32_buf = ADIOI_Malloc(e32_size * count);
        xbuf = e32_buf;
    }

    if (buftype_is_contig && filetype_is_contig) {
        /* convert count and offset to bytes */
        bufsize = datatype_size * count;
        if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
            off = adio_fh->disp + adio_fh->etype_size * offset;
        } else {        /* ADIO_INDIVIDUAL */

            off = adio_fh->fp_ind;
        }

        /* if atomic mode requested, lock (exclusive) the region, because
         * there could be a concurrent noncontiguous request.
         */
        if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
            ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
        }

        ADIO_ReadContig(adio_fh, xbuf, count, datatype, file_ptr_type, off, status, &error_code);

        if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
            ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
        }
    } else {
        ADIO_ReadStrided(adio_fh, xbuf, count, datatype, file_ptr_type,
                         offset, status, &error_code);
        /* For strided and atomic mode, locking is done in ADIO_ReadStrided */
    }

    /* --BEGIN ERROR HANDLING-- */
    if (error_code != MPI_SUCCESS)
        error_code = MPIO_Err_return_file(adio_fh, error_code);
    /* --END ERROR HANDLING-- */

    if (e32_buf != NULL) {
        error_code = MPIU_read_external32_conversion_fn(buf, datatype, count, e32_buf);
        ADIOI_Free(e32_buf);
    }

  fn_exit:
    ROMIO_THREAD_CS_EXIT();

    return error_code;
}
#endif