oracular (3) MPI_Recv_init.openmpi.3.gz

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.

SEE ALSO

       MPI_Bsend_init
       MPI_Rsend_init
       MPI_Send_init
       MPI_Sssend_init
       MPI_Start
       MPI_Startall
       MPI_Request_free