MPI_Grequest_complete(3)           Open MPI           MPI_Grequest_complete(3)



NAME
       MPI_Grequest_complete  - Reports that a generalized request is
       complete.


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


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


C++ Syntax
       #include <mpi.h>
       void MPI::Grequest::Complete()


INPUT/OUTPUT PARAMETER
       request   Generalized request (handle).


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


DESCRIPTION
       MPI_Grequest_complete informs MPI that the operations represented by
       the generalized request request are complete. A call to
       MPI_Wait(request, status) will return, and a call to MPI_Test(request,
       flag, status) will return flag=true only after a call to
       MPI_Grequest_complete has declared that these operations are complete.

       MPI imposes no restrictions on the code executed by the callback
       functions. However, new nonblocking operations should be defined so
       that the general semantic rules about MPI calls such as MPI_Test,
       MPI_Request_free, or MPI_Cancel still hold. For example, all these
       calls are supposed to be local and nonblocking. Therefore, the callback
       functions query_fn, free_fn, or cancel_fn should invoke blocking MPI
       communication calls only if the context is such that these calls are
       guaranteed to return in finite time. Once MPI_Cancel has been invoked,
       the canceled operation should complete in finite time, regardless of
       the state of other processes (the operation has acquired "local"
       semantics). It should either succeed or fail without side-effects. The
       user should guarantee these same properties for newly defined
       operations.


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.





1.4.1                            Jan 14, 2010         MPI_Grequest_complete(3)
