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.