/* -*- 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_Rsend_init */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Rsend_init = PMPI_Rsend_init

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Rsend_init  MPI_Rsend_init

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Rsend_init as PMPI_Rsend_init

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Rsend_init(const void *buf, int count, MPI_Datatype datatype, int dest, int tag,

                   MPI_Comm comm, MPI_Request *request) __attribute__((weak,alias("PMPI_Rsend_init")));

#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_Rsend_init

#define MPI_Rsend_init PMPI_Rsend_init

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Rsend_init

/*@

    MPI_Rsend_init - Creates a persistent request for a ready send

Input Parameters:

+ buf - initial address of send buffer (choice) 

. count - number of elements sent (integer) 

. datatype - type of each element (handle) 

. dest - rank of destination (integer) 

. tag - message tag (integer) 

- comm - communicator (handle) 

Output Parameters:

. request - communication request (handle) 

.N ThreadSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

.N MPI_ERR_COUNT

.N MPI_ERR_TYPE

.N MPI_ERR_RANK

.N MPI_ERR_TAG

.N MPI_ERR_COMM

.N MPI_ERR_EXHAUSTED

.seealso: MPI_Start, MPI_Request_free, MPI_Send_init

@*/

int MPI_Rsend_init(const void *buf, int count, MPI_Datatype datatype, int dest,

		   int tag, MPI_Comm comm, MPI_Request *request)

{

    static const char FCNAME[] = "MPI_Rsend_init";

    int mpi_errno = MPI_SUCCESS;

    MPID_Comm *comm_ptr = NULL;

    MPID_Request *request_ptr = NULL;

    MPID_MPI_STATE_DECL(MPID_STATE_MPI_RSEND_INIT);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPID_MPI_PT2PT_FUNC_ENTER(MPID_STATE_MPI_RSEND_INIT);

    /* Validate handle parameters needing to be converted */

#   ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

	    MPIR_ERRTEST_COMM(comm, mpi_errno);

	}

        MPID_END_ERROR_CHECKS;

    }

#   endif /* HAVE_ERROR_CHECKING */

    /* Convert MPI object handles to object pointers */

    MPID_Comm_get_ptr( comm, comm_ptr );

    /* Validate parameters if error checking is enabled */

#   ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPID_Comm_valid_ptr( comm_ptr, mpi_errno, FALSE );

            if (mpi_errno) goto fn_fail;

	    MPIR_ERRTEST_COUNT(count, mpi_errno);

	    MPIR_ERRTEST_SEND_RANK(comm_ptr, dest, mpi_errno);

	    MPIR_ERRTEST_SEND_TAG(tag, mpi_errno);

	    MPIR_ERRTEST_ARGNULL(request,"request",mpi_errno);

	    /* Validate datatype handle */

	    MPIR_ERRTEST_DATATYPE(datatype, "datatype", mpi_errno);

	    /* Validate datatype object */

	    if (HANDLE_GET_KIND(datatype) != HANDLE_KIND_BUILTIN)

	    {

		MPID_Datatype *datatype_ptr = NULL;

		MPID_Datatype_get_ptr(datatype, datatype_ptr);

		MPID_Datatype_valid_ptr(datatype_ptr, mpi_errno);

		if (mpi_errno) goto fn_fail;

		MPID_Datatype_committed_ptr(datatype_ptr, mpi_errno);

		if (mpi_errno) goto fn_fail;

	    }

	    /* Validate buffer */

	    MPIR_ERRTEST_USERBUFFER(buf,count,datatype,mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#   endif /* HAVE_ERROR_CHECKING */

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

    mpi_errno = MPID_Rsend_init(buf, count, datatype, dest, tag, comm_ptr,

				MPID_CONTEXT_INTRA_PT2PT, &request_ptr);

    if (mpi_errno != MPI_SUCCESS) goto fn_fail;

    /* return the handle of the request to the user */

    MPID_OBJ_PUBLISH_HANDLE(*request, request_ptr->handle);

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

  fn_exit:

    MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_RSEND_INIT);

    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_rsend_init",

	    "**mpi_rsend_init %p %d %D %i %t %C %p", buf, count, datatype, dest, tag, comm, request);

    }

#   endif

    mpi_errno = MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}