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MPI_Recv_init(3) man page (version 3.0.0)

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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

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


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