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MPI_Start(3OpenMPI)                                                                      MPI_Start(3OpenMPI)



NAME
       MPI_Start - Initiates a communication using a persistent request handle.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Start(MPI_Request *request)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_START(REQUEST, IERROR)
            INTEGER   REQUEST, IERROR


C++ Syntax
       #include <mpi.h>
       void Prequest::Start()


INPUT PARAMETER
       request   Communication request (handle).


OUTPUT PARAMETER
       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       A  communication  (send  or  receive)  that  uses  a  persistent request is initiated by the function
       MPI_Start.

       The argument, request, is a handle returned by one of the persistent  communication-request  initial-ization initialization
       ization  functions  (MPI_Send_init,  MPI_Bsend_init,  MPI_Ssend_init, MPI_Rsend_init, MPI_Recv_init).
       The associated request should be inactive and becomes active once the call is made.

       If the request is for a send with ready mode, then a matching receive should  be  posted  before  the
       call  is  made. From the time the call is made until after the operation completes, the communication
       buffer should not be accessed.

       The call is local, with semantics similar to the nonblocking communication  operations  (see  Section
       3.7  in the MPI-1 Standard, "Nonblocking Communication.") That is, a call to MPI_Start with a request
       created by MPI_Send_init starts a communication in the same manner as a call to MPI_Isend; a call  to
       MPI_Start  with  a  request  created by MPI_Bsend_init starts a communication in the same manner as a
       call to MPI_Ibsend; and so on.


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_Recv_init
       MPI_Startall





Open MPI 1.2                                   September 2006                            MPI_Start(3OpenMPI)