17.2.281. MPI_Precv_init

MPI_Precv_init - Initializes a partitioned receive.

17.2.281.1. SYNTAX

17.2.281.1.1. C Syntax

#include <mpi.h>

int MPI_Precv_init(const void *buf, int partitions, int count, MPI_Datatype datatype, int dest,
     int tag, MPI_Comm comm, MPI_Request *request)

17.2.281.1.2. Fortran Syntax

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

17.2.281.1.3. Fortran 2008 Syntax

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

17.2.281.2. INPUT PARAMETERS

buf: Initial address of receive buffer (choice).
partitions: Number of partitions (integer).
count: Number of elements to be received per partition (integer).
datatype: Datatype of each element (handle).
dest: Rank of source (integer).
tag: Message tag (integer).
comm: Communicator (handle).

17.2.281.3. OUTPUT PARAMETERS

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

17.2.281.4. ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.

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.

17.2.281.5. NOTE

The current implementation is an early prototype and is not fully compliant with the MPI-4.0 specification. Specifically this function and it’s counterpart (MPI_Psend_init) will block until the partitioned communication request is initialized on both ends. This behavior will be corrected in future versions.