/* -*- 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_set_atomicity = PMPI_File_set_atomicity

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_File_set_atomicity MPI_File_set_atomicity

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_File_set_atomicity as PMPI_File_set_atomicity

/* end of weak pragmas */

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_File_set_atomicity(MPI_File fh, int flag)

    __attribute__ ((weak, alias("PMPI_File_set_atomicity")));

#endif

/* Include mapping from MPI->PMPI */

#define MPIO_BUILD_PROFILING

#include "mpioprof.h"

#endif

/*@

    MPI_File_set_atomicity - Sets the atomicity mode

Input Parameters:

. fh - file handle (handle)

. flag - true to set atomic mode, false to set nonatomic mode (logical)

.N fortran

@*/

int MPI_File_set_atomicity(MPI_File fh, int flag)

{

    int error_code, tmp_flag;

    static char myname[] = "MPI_FILE_SET_ATOMICITY";

    ADIO_Fcntl_t *fcntl_struct;

    ADIO_File adio_fh;

    ROMIO_THREAD_CS_ENTER();

    adio_fh = MPIO_File_resolve(fh);

    /* --BEGIN ERROR HANDLING-- */

    MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);

    /* --END ERROR HANDLING-- */

    ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);

    if (flag)

        flag = 1;       /* take care of non-one values! */

/* check if flag is the same on all processes */

    tmp_flag = flag;

    MPI_Bcast(&tmp_flag, 1, MPI_INT, 0, adio_fh->comm);

    /* --BEGIN ERROR HANDLING-- */

    if (tmp_flag != flag) {

        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,

                                          myname, __LINE__, MPI_ERR_ARG, "**notsame", 0);

        error_code = MPIO_Err_return_file(adio_fh, error_code);

        goto fn_exit;

    }

    /* --END ERROR HANDLING-- */

    if (adio_fh->atomicity == flag) {

        error_code = MPI_SUCCESS;

        goto fn_exit;

    }

    fcntl_struct = (ADIO_Fcntl_t *) ADIOI_Malloc(sizeof(ADIO_Fcntl_t));

    fcntl_struct->atomicity = flag;

    ADIO_Fcntl(adio_fh, ADIO_FCNTL_SET_ATOMICITY, fcntl_struct, &error_code);

    /* TODO: what do we do with this error code? */

    /* --BEGIN ERROR HANDLING-- */

    if (error_code != MPI_SUCCESS)

        error_code = MPIO_Err_return_file(adio_fh, error_code);

    /* --END ERROR HANDLING-- */

    ADIOI_Free(fcntl_struct);

  fn_exit:

    ROMIO_THREAD_CS_EXIT();

    return error_code;

}