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.