/* -*- 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_Recv_init */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Recv_init = PMPI_Recv_init
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Recv_init  MPI_Recv_init
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Recv_init as PMPI_Recv_init
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Recv_init(void *buf, int count, MPI_Datatype datatype, int source, int tag,
                  MPI_Comm comm, MPI_Request *request) __attribute__((weak,alias("PMPI_Recv_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_Recv_init
#define MPI_Recv_init PMPI_Recv_init

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Recv_init

/*@
    MPI_Recv_init - Create a persistent request for a receive

Input Parameters:
+ buf - initial address of receive buffer (choice) 
. count - number of elements received (integer) 
. datatype - type of each element (handle) 
. source - rank of source or 'MPI_ANY_SOURCE' (integer) 
. tag - message tag or 'MPI_ANY_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_Startall, MPI_Request_free
@*/
int MPI_Recv_init(void *buf, int count, MPI_Datatype datatype, int source, 
		  int tag, MPI_Comm comm, MPI_Request *request)
{
    static const char FCNAME[] = "MPI_Recv_init";
    int mpi_errno = MPI_SUCCESS;
    MPID_Comm *comm_ptr = NULL;
    MPID_Request *request_ptr = NULL;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_RECV_INIT);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPID_MPI_PT2PT_FUNC_ENTER(MPID_STATE_MPI_RECV_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_RECV_RANK(comm_ptr, source, mpi_errno);
	    MPIR_ERRTEST_RECV_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_Recv_init(buf, count, datatype, source, 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_RECV_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_recv_init",
	    "**mpi_recv_init %p %d %D %i %t %C %p", buf, count, datatype, source, tag, comm, request);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}
