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

/*

 *  (C) 2011 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpiimpl.h"

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

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Mrecv = PMPI_Mrecv

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Mrecv  MPI_Mrecv

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Mrecv as PMPI_Mrecv

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Mrecv(void *buf, int count, MPI_Datatype datatype, MPI_Message * message,

              MPI_Status * status) __attribute__ ((weak, alias("PMPI_Mrecv")));

#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_Mrecv

#define MPI_Mrecv PMPI_Mrecv

/* any non-MPI functions go here, especially non-static ones */

#endif /* MPICH_MPI_FROM_PMPI */

#undef FUNCNAME

#define FUNCNAME MPI_Mrecv

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

MPI_Mrecv - Blocking receive of message matched by MPI_Mprobe or MPI_Improbe.

Input/Output Parameters:

. message - message (handle)

Input Parameters:

+ count - number of elements in the receive buffer (non-negative integer)

- datatype - datatype of each receive buffer element (handle)

Output Parameters:

+ buf - initial address of the receive buffer (choice)

- status - status object (status)

.N ThreadSafe

.N Fortran

.N Errors

@*/

int MPI_Mrecv(void *buf, int count, MPI_Datatype datatype, MPI_Message * message,

              MPI_Status * status)

{

    int mpi_errno = MPI_SUCCESS, active_flag;   /* dummy for MPIR_Request_completion_processing */

    MPIR_Request *msgp = NULL, *rreq = NULL;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_MRECV);

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_MRECV);

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

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPIR_ERRTEST_DATATYPE(datatype, "datatype", mpi_errno);

            /* TODO more checks may be appropriate */

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

    /* Convert MPI object handles to object pointers */

    MPIR_Request_get_ptr(*message, msgp);

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

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            if (HANDLE_GET_KIND(datatype) != HANDLE_KIND_BUILTIN) {

                MPIR_Datatype *datatype_ptr = NULL;

                MPIR_Datatype_get_ptr(datatype, datatype_ptr);

                MPIR_Datatype_valid_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno != MPI_SUCCESS)

                    goto fn_fail;

                MPIR_Datatype_committed_ptr(datatype_ptr, mpi_errno);

                if (mpi_errno != MPI_SUCCESS)

                    goto fn_fail;

            }

            /* MPI_MESSAGE_NO_PROC should yield a "proc null" status */

            if (*message != MPI_MESSAGE_NO_PROC) {

                MPIR_Request_valid_ptr(msgp, mpi_errno);

                if (mpi_errno)

                    MPIR_ERR_POP(mpi_errno);

                MPIR_ERR_CHKANDJUMP((msgp->kind != MPIR_REQUEST_KIND__MPROBE),

                                    mpi_errno, MPI_ERR_ARG, "**reqnotmsg");

            }

            /* TODO more checks may be appropriate (counts, in_place, buffer aliasing, etc) */

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

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

    mpi_errno = MPID_Mrecv(buf, count, datatype, msgp, status, &rreq);

    if (mpi_errno)

        MPIR_ERR_POP(mpi_errno);

    /* rreq == NULL implies message = MPI_MESSAGE_NO_PROC.

     * I.e, status was set and no need to wait on rreq */

    if (rreq != NULL) {

        mpi_errno = MPID_Wait(rreq, status);

        if (mpi_errno)

            MPIR_ERR_POP(mpi_errno);

        mpi_errno = MPIR_Request_completion_processing(rreq, status, &active_flag);

        MPIR_Request_free(rreq);

        if (mpi_errno)

            MPIR_ERR_POP(mpi_errno);

    }

    *message = MPI_MESSAGE_NULL;

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

  fn_exit:

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_MRECV);

    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_mrecv", "**mpi_mrecv %p %d %D %p %p", buf, count, datatype,

                                 message, status);

    }

#endif

    mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}