NAME

MPI_Recv_init - Builds a handle for a receive.

SYNTAX

C Syntax

#include <mpi.h>
int MPI_Recv_init(void *buf, int count, MPI_Datatype datatype,
	int source, int tag, MPI_Comm comm, MPI_Request *request)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_RECV_INIT(BUF, COUNT, DATATYPE, SOURCE, TAG, COMM, REQUEST,
		IERROR)
	<type>	BUF(*)
	INTEGER	COUNT, DATATYPE, SOURCE, TAG, COMM, REQUEST, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_Recv_init(buf, count, datatype, source, tag, comm, request, ierror)
	TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buf
	INTEGER, INTENT(IN) :: count, source, tag
	TYPE(MPI_Datatype), INTENT(IN) :: datatype
	TYPE(MPI_Comm), INTENT(IN) :: comm
	TYPE(MPI_Request), INTENT(OUT) :: request
	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

C++ Syntax

#include <mpi.h>
Prequest Comm::Recv_init(void* buf, int count, const
	Datatype& datatype, int source, int tag) const

INPUT PARAMETERS

count: Maximum number of elements to receive (integer).
datatype: Type of each entry (handle).
source: Rank of source (integer).
tag: Message tag (integer).
comm: Communicator (handle).

INPUT/OUTPUT PARAMETER

buf: Initial address of receive buffer (choice).

OUTPUT PARAMETERS

request: Communication request (handle).
IERROR: Fortran only: Error status (integer).

DESCRIPTION

Creates a persistent communication request for a receive operation. The argument buf is marked as OUT because the user gives permission to write on the receive buffer by passing the argument to MPI_Recv_init.

A persistent communication request is inactive after it is created -- no active communication is attached to the request.

A communication (send or receive) that uses a persistent request is initiated by the function MPI_Start or MPI_Startall.

ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.