/* -*- 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_Comm_spawn */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Comm_spawn = PMPI_Comm_spawn

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Comm_spawn  MPI_Comm_spawn

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Comm_spawn as PMPI_Comm_spawn

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Comm_spawn(const char *command, char *argv[], int maxprocs, MPI_Info info, int root,

                   MPI_Comm comm, MPI_Comm * intercomm, int array_of_errcodes[])

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

#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_Comm_spawn

#define MPI_Comm_spawn PMPI_Comm_spawn

/* Any internal routines can go here.  Make them static if possible */

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Comm_spawn

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

   MPI_Comm_spawn - Spawn up to maxprocs instances of a single MPI application

Input Parameters:

+ command - name of program to be spawned (string, significant only at root)

. argv - arguments to command (array of strings, significant only at root)

. maxprocs - maximum number of processes to start (integer, significant only

  at root)

. info - a set of key-value pairs telling the runtime system where and how

   to start the processes (handle, significant only at root)

. root - rank of process in which previous arguments are examined (integer)

- comm - intracommunicator containing group of spawning processes (handle)

Output Parameters:

+ intercomm - intercommunicator between original group and the

   newly spawned group (handle)

- array_of_errcodes - one code per process (array of integer)

.N ThreadSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

.N MPI_ERR_COMM

.N MPI_ERR_ARG

.N MPI_ERR_INFO

.N MPI_ERR_SPAWN

@*/

int MPI_Comm_spawn(const char *command, char *argv[], int maxprocs, MPI_Info info,

                   int root, MPI_Comm comm, MPI_Comm * intercomm, int array_of_errcodes[])

{

    int mpi_errno = MPI_SUCCESS;

    MPIR_Comm *comm_ptr = NULL, *intercomm_ptr;

    MPIR_Info *info_ptr = NULL;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_COMM_SPAWN);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_COMM_SPAWN);

    /* Validate parameters, especially handles needing to be converted */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPIR_ERRTEST_COMM(comm, mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#endif

    /* Convert MPI object handles to object pointers */

    MPIR_Comm_get_ptr(comm, comm_ptr);

    /* Validate parameters and objects (post conversion) */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            /* Validate comm_ptr */

            MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, FALSE);

            /* If comm_ptr is not valid, it will be reset to null */

            if (mpi_errno)

                goto fn_fail;

            MPIR_ERRTEST_COMM_INTRA(comm_ptr, mpi_errno);

            MPIR_ERRTEST_RANK(comm_ptr, root, mpi_errno);

            if (comm_ptr->rank == root) {

                MPIR_ERRTEST_INFO_OR_NULL(info, mpi_errno);

                MPIR_ERRTEST_ARGNULL(command, "command", mpi_errno);

                MPIR_ERRTEST_ARGNEG(maxprocs, "maxprocs", mpi_errno);

            }

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

    if (comm_ptr->rank == root) {

        MPIR_Info_get_ptr(info, info_ptr);

    }

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

    mpi_errno = MPID_Comm_spawn_multiple(1, (char **) &command, &argv,

                                         &maxprocs, &info_ptr, root,

                                         comm_ptr, &intercomm_ptr, array_of_errcodes);

    if (mpi_errno != MPI_SUCCESS)

        goto fn_fail;

    MPIR_OBJ_PUBLISH_HANDLE(*intercomm, intercomm_ptr->handle);

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

  fn_exit:

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_COMM_SPAWN);

    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    return mpi_errno;

  fn_fail:

    /* --BEGIN ERROR HANDLING-- */

#ifdef HAVE_ERROR_CHECKING

    {

        mpi_errno =

            MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,

                                 "**mpi_comm_spawn", "**mpi_comm_spawn %s %p %d %I %d %C %p %p",

                                 command, argv, maxprocs, info, root, comm, intercomm,

                                 array_of_errcodes);

    }

#endif

    mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}