/* -*- 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_Sendrecv */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Sendrecv = PMPI_Sendrecv

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Sendrecv  MPI_Sendrecv

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Sendrecv as PMPI_Sendrecv

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Sendrecv(const void *sendbuf, int sendcount, MPI_Datatype sendtype, int dest,

                 int sendtag, void *recvbuf, int recvcount, MPI_Datatype recvtype,

                 int source, int recvtag, MPI_Comm comm, MPI_Status * status)

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

#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_Sendrecv

#define MPI_Sendrecv PMPI_Sendrecv

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Sendrecv

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

    MPI_Sendrecv - Sends and receives a message

Input Parameters:

+ sendbuf - initial address of send buffer (choice)

. sendcount - number of elements in send buffer (integer)

. sendtype - type of elements in send buffer (handle)

. dest - rank of destination (integer)

. sendtag - send tag (integer)

. recvcount - number of elements in receive buffer (integer)

. recvtype - type of elements in receive buffer (handle)

. source - rank of source (integer)

. recvtag - receive tag (integer)

- comm - communicator (handle)

Output Parameters:

+ recvbuf - initial address of receive buffer (choice)

- status - status object (Status).  This refers to the receive operation.

.N ThreadSafe

.N Fortran

.N FortranStatus

.N Errors

.N MPI_SUCCESS

.N MPI_ERR_COMM

.N MPI_ERR_COUNT

.N MPI_ERR_TYPE

.N MPI_ERR_TAG

.N MPI_ERR_RANK

@*/

int MPI_Sendrecv(const void *sendbuf, int sendcount, MPI_Datatype sendtype,

                 int dest, int sendtag,

                 void *recvbuf, int recvcount, MPI_Datatype recvtype,

                 int source, int recvtag, MPI_Comm comm, MPI_Status * status)

{

    int mpi_errno = MPI_SUCCESS;

    MPIR_Comm *comm_ptr = NULL;

    MPIR_Request *sreq = NULL;

    MPIR_Request *rreq = NULL;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_SENDRECV);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(VNI_GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPIR_FUNC_TERSE_PT2PT_ENTER_BOTH(MPID_STATE_MPI_SENDRECV);

    /* 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 handles to MPI objects. */

    MPIR_Comm_get_ptr(comm, comm_ptr);

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            /* Validate communicator */

            MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, FALSE);

            if (mpi_errno)

                goto fn_fail;

            /* Validate count */

            MPIR_ERRTEST_COUNT(sendcount, mpi_errno);

            MPIR_ERRTEST_COUNT(recvcount, mpi_errno);

            /* Validate status (status_ignore is not the same as null) */

            MPIR_ERRTEST_ARGNULL(status, "status", mpi_errno);

            /* Validate tags */

            MPIR_ERRTEST_SEND_TAG(sendtag, mpi_errno);

            MPIR_ERRTEST_RECV_TAG(recvtag, mpi_errno);

            /* Validate source and destination */

            if (comm_ptr) {

                MPIR_ERRTEST_SEND_RANK(comm_ptr, dest, mpi_errno);

                MPIR_ERRTEST_RECV_RANK(comm_ptr, source, mpi_errno);

            }

            /* Validate datatype handles */

            MPIR_ERRTEST_DATATYPE(sendtype, "datatype", mpi_errno);

            MPIR_ERRTEST_DATATYPE(recvtype, "datatype", mpi_errno);

            /* Validate datatype objects */

            if (HANDLE_GET_KIND(sendtype) != HANDLE_KIND_BUILTIN) {

                MPIR_Datatype *datatype_ptr = NULL;

                MPIR_Datatype_get_ptr(sendtype, datatype_ptr);

                MPIR_Datatype_valid_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno)

                    goto fn_fail;

                MPIR_Datatype_committed_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno)

                    goto fn_fail;

            }

            if (HANDLE_GET_KIND(recvtype) != HANDLE_KIND_BUILTIN) {

                MPIR_Datatype *datatype_ptr = NULL;

                MPIR_Datatype_get_ptr(recvtype, datatype_ptr);

                MPIR_Datatype_valid_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno)

                    goto fn_fail;

                MPIR_Datatype_committed_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno)

                    goto fn_fail;

            }

            /* Validate buffers */

            MPIR_ERRTEST_USERBUFFER(sendbuf, sendcount, sendtype, mpi_errno);

            MPIR_ERRTEST_USERBUFFER(recvbuf, recvcount, recvtype, mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

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

    mpi_errno =

        MPID_Irecv(recvbuf, recvcount, recvtype, source, recvtag, comm_ptr,

                   MPIR_CONTEXT_INTRA_PT2PT, &rreq);

    if (mpi_errno != MPI_SUCCESS)

        goto fn_fail;

    /* FIXME - Performance for small messages might be better if MPID_Send() were used here instead of MPID_Isend() */

    mpi_errno =

        MPID_Isend(sendbuf, sendcount, sendtype, dest, sendtag, comm_ptr, MPIR_CONTEXT_INTRA_PT2PT,

                   &sreq);

    if (mpi_errno != MPI_SUCCESS) {

        /* --BEGIN ERROR HANDLING-- */

        if (mpi_errno == MPIX_ERR_NOREQ)

            MPIR_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**nomem");

        /* FIXME: should we cancel the pending (possibly completed) receive request or wait for it to complete? */

        MPIR_Request_free(rreq);

        goto fn_fail;

        /* --END ERROR HANDLING-- */

    }

    if (!MPIR_Request_is_complete(sreq) || !MPIR_Request_is_complete(rreq)) {

        MPID_Progress_state progress_state;

        MPID_Progress_start(&progress_state);

        while (!MPIR_Request_is_complete(sreq) || !MPIR_Request_is_complete(rreq)) {

            mpi_errno = MPID_Progress_wait(&progress_state);

            if (mpi_errno != MPI_SUCCESS) {

                /* --BEGIN ERROR HANDLING-- */

                MPID_Progress_end(&progress_state);

                goto fn_fail;

                /* --END ERROR HANDLING-- */

            }

            if (unlikely(MPIR_Request_is_anysrc_mismatched(rreq))) {

                /* --BEGIN ERROR HANDLING-- */

                mpi_errno = MPIR_Request_handle_proc_failed(rreq);

                if (!MPIR_Request_is_complete(sreq)) {

                    MPID_Cancel_send(sreq);

                    MPIR_STATUS_SET_CANCEL_BIT(sreq->status, FALSE);

                }

                goto fn_fail;

                /* --END ERROR HANDLING-- */

            }

        }

        MPID_Progress_end(&progress_state);

    }

    mpi_errno = rreq->status.MPI_ERROR;

    MPIR_Request_extract_status(rreq, status);

    MPIR_Request_free(rreq);

    if (mpi_errno == MPI_SUCCESS) {

        mpi_errno = sreq->status.MPI_ERROR;

    }

    MPIR_Request_free(sreq);

    if (mpi_errno != MPI_SUCCESS)

        goto fn_fail;

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

  fn_exit:

    MPIR_FUNC_TERSE_PT2PT_EXIT_BOTH(MPID_STATE_MPI_SENDRECV);

    MPID_THREAD_CS_EXIT(VNI_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_sendrecv",

                                 "**mpi_sendrecv %p %d %D %i %t %p %d %D %i %t %C %p", sendbuf,

                                 sendcount, sendtype, dest, sendtag, recvbuf, recvcount, recvtype,

                                 source, recvtag, comm, status);

    }

#endif

    mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}