/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpiimpl.h"

/* -- Begin Profiling Symbol Block for routine MPI_Wtime */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Wtime = PMPI_Wtime

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Wtime  MPI_Wtime

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Wtime as PMPI_Wtime

#elif defined(HAVE_WEAK_ATTRIBUTE)

double MPI_Wtime(void) __attribute__ ((weak, alias("PMPI_Wtime")));

#endif

/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build

   the MPI routines */

#ifndef MPICH_MPI_FROM_PMPI

#undef MPI_Wtime

#define MPI_Wtime PMPI_Wtime

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Wtime

/*@

  MPI_Wtime - Returns an elapsed time on the calling processor

  Return value:

  Time in seconds since an arbitrary time in the past.

  Notes:

  This is intended to be a high-resolution, elapsed (or wall) clock.

  See 'MPI_WTICK' to determine the resolution of 'MPI_WTIME'.

  If the attribute 'MPI_WTIME_IS_GLOBAL' is defined and true, then the

  value is synchronized across all processes in 'MPI_COMM_WORLD'.

  Notes for Fortran:

  This is a function, declared as 'DOUBLE PRECISION MPI_WTIME()' in Fortran.

.see also: MPI_Wtick, MPI_Comm_get_attr, MPI_Attr_get

@*/

double MPI_Wtime(void)

{

    double d;

    MPID_Time_t t;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_WTIME);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_WTIME);

    MPID_Wtime(&t);

    MPID_Wtime_todouble(&t, &d);

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_WTIME);

    return d;

}