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MPI_Isend(3OpenMPI)                                                                      MPI_Isend(3OpenMPI)



NAME
       MPI_Isend - Starts a standard-mode, nonblocking send.


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


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_ISEND(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::Isend(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  Datatype 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_Isend  starts  a  standard-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.

       A  send  request can be determined being completed by calling the MPI_Wait, MPI_Waitany, MPI_Test, or
       MPI_Testany with request returned by this function.


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_Send MPI_Wait MPI_Waitany MPI_Test MPI_Testany




Open MPI 1.2                                     March 2007                              MPI_Isend(3OpenMPI)