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MPI_Test_cancelled - Tests whether a request was canceled.
#include <mpi.h>
int MPI_Test_cancelled(const MPI_Status *status, int *flag)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_TEST_CANCELLED(STATUS, FLAG, IERROR)
LOGICAL FLAG
INTEGER STATUS(MPI_STATUS_SIZE), IERROR
USE mpi_f08
MPI_Test_cancelled(status, flag, ierror)
TYPE(MPI_Status), INTENT(IN) :: status
LOGICAL, INTENT(OUT) :: flag
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- status
- Status object (status).
- flag
- True
if operation was cancelled (logical).
- IERROR
- Fortran only: Error status
(integer).
Returns flag = true if the communication associated
with the status object was canceled successfully. In such a case, all other
fields of status (such as count or tag) are undefined. Otherwise, returns
flag = false. If a receive operation might be canceled, one should call
MPI_Test_cancelled first, to check whether the operation was canceled,
before checking on the other fields of the return status.
Cancel can
be an expensive operation that should be used only exceptionally.
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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