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MPI_Ibsend(3OpenMPI)                                                                    MPI_Ibsend(3OpenMPI)



NAME
       MPI_Ibsend - Starts a nonblocking buffered send.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Ibsend(void *buf, int count, MPI_Datatype datatype,
            int dest, int tag, MPI_Comm comm, MPI_Request *request)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_IBSEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR)
            <type>    BUF(*)
            INTEGER   COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR


C++ Syntax
       #include <mpi.h>
       Request Comm::Ibsend(const void* buf, int count, const
            Datatype& datatype, int dest, int tag) const


INPUT PARAMETERS
       buf       Initial address of send buffer (choice).

       count     Number of elements in send buffer (integer).

       datatype  Data type of each send buffer element (handle).

       dest      Rank of destination (integer).

       tag       Message tag (integer).

       comm      Communicator (handle).


OUTPUT PARAMETERS
       request   Communication request (handle).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_Ibsend  posts  a  buffered-mode,  nonblocking  send.  Nonblocking  calls allocate a communication
       request object and associate it with the request handle (the argument request). The  request  can  be
       used later to query the status of the communication or wait for its completion.

       A  nonblocking send call indicates that the system may start copying data out of the send buffer. The
       sender should not access any part of the send buffer after a nonblocking send  operation  is  called,
       until the send completes.


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_Test MPI_Wait





Open MPI 1.2                                   September 2006                           MPI_Ibsend(3OpenMPI)