MPI_Recv_init(3)

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)

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.

SEE ALSO

MPI_Bsend_init
MPI_Rsend_init
MPI_Send_init
MPI_Sssend_init
MPI_Start
MPI_Startall
MPI_Request_free