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MPI_Grequest_complete - Reports that a generalized request is
complete.
#include <mpi.h>
int MPI_Grequest_complete(MPI_Request request)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_GREQUEST_COMPLETE(REQUEST, IERROR)
INTEGER REQUEST, IERROR
USE mpi_f08
MPI_Grequest_complete(request, ierror)
TYPE(MPI_Request), INTENT(IN) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- request
- Generalized request (handle).
- IERROR
- Fortran only: Error status (integer).
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.
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.
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