18.2.267. MPI_Op_commutative
MPI_Op_commutative - Query of commutativity of reduction operation.
18.2.267.1. SYNTAX
18.2.267.1.1. C Syntax
#include <mpi.h>
int MPI_Op_commutative(MPI_Op op, int *commute)
18.2.267.1.2. Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_OP_COMMUTATIVE(OP, COMMUTE, IERROR)
LOGICAL COMMUTE
INTEGER OP, IERROR
18.2.267.1.3. Fortran 2008 Syntax
USE mpi_f08
MPI_Op_commutative(op, commute, ierror)
TYPE(MPI_Op), INTENT(IN) :: op
INTEGER, INTENT(OUT) :: commute
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
18.2.267.2. INPUT PARAMETER
op
: Operation (handle).
18.2.267.3. OUTPUT PARAMETERS
commute
: True if op is commutative, false otherwise (logical).IERROR
: Fortran only: Error status (integer).
18.2.267.4. DESCRIPTION
Reduction operations can be queried for their commutativity.
18.2.267.5. ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
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.
See also