/* -*- 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_Is_thread_main */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Is_thread_main = PMPI_Is_thread_main

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Is_thread_main  MPI_Is_thread_main

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Is_thread_main as PMPI_Is_thread_main

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Is_thread_main(int *flag) __attribute__((weak,alias("PMPI_Is_thread_main")));

#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_Is_thread_main

#define MPI_Is_thread_main PMPI_Is_thread_main

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Is_thread_main

/*@

   MPI_Is_thread_main - Returns a flag indicating whether this thread called 

                        'MPI_Init' or 'MPI_Init_thread'

Output Parameters:

. flag - Flag is true if 'MPI_Init' or 'MPI_Init_thread' has been called by 

         this thread and false otherwise.  (logical)

.N SignalSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

@*/

int MPI_Is_thread_main( int *flag )

{

#ifdef HAVE_ERROR_CHECKING

    static const char FCNAME[] = "MPI_Is_thread_main";

#endif

    int mpi_errno = MPI_SUCCESS;

    MPID_MPI_STATE_DECL(MPID_STATE_MPI_IS_THREAD_MAIN);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

#   ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

	    MPIR_ERRTEST_ARGNULL(flag,"flag",mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#   endif /* HAVE_ERROR_CHECKING */

    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_IS_THREAD_MAIN);

    /* ... body of routine ...  */

#   if MPICH_THREAD_LEVEL <= MPI_THREAD_FUNNELED || ! defined(MPICH_IS_THREADED)

    {

	*flag = TRUE;

    }

#   else

    {

	MPID_Thread_id_t my_thread_id;

	MPID_Thread_self(&my_thread_id);

	MPID_Thread_same(&MPIR_ThreadInfo.master_thread, &my_thread_id, flag);

    }

#   endif

    /* ... end of body of routine ... */

#ifdef HAVE_ERROR_CHECKING

  fn_exit:

#endif

    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_IS_THREAD_MAIN);

    return mpi_errno;

    /* --BEGIN ERROR HANDLING-- */

#   ifdef HAVE_ERROR_CHECKING

  fn_fail:

    {

	mpi_errno = MPIR_Err_create_code(

	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, 

	    MPI_ERR_OTHER, "**mpi_is_thread_main",

	    "**mpi_is_thread_main %p", flag);

    }

    mpi_errno = MPIR_Err_return_comm( 0, FCNAME, mpi_errno );

    goto fn_exit;

#   endif

    /* --END ERROR HANDLING-- */

}