17.2.250. MPI_Keyval_free

MPI_Keyval_free - Frees attribute key for communicator cache attribute – use of this routine is deprecated.

17.2.250.1. SYNTAX

17.2.250.1.1. C Syntax

#include <mpi.h>

int MPI_Keyval_free(int *keyval)

17.2.250.1.2. Fortran Syntax

INCLUDE 'mpif.h'
MPI_KEYVAL_FREE(KEYVAL, IERROR)
     INTEGER KEYVAL, IERROR

17.2.250.2. INPUT PARAMETER

  • keyval: Frees the integer key value (integer).

17.2.250.3. OUTPUT PARAMETER

  • IERROR: Fortran only: Error status (integer).

17.2.250.4. DESCRIPTION

Note that use of this routine is deprecated as of MPI-2. Please use MPI_Comm_free_keyval instead.

Frees an extant attribute key. This function sets the value of keyval to MPI_KEYVAL_INVALID. Note that it is not erroneous to free an attribute key that is in use, because the actual free does not transpire until after all references (in other communicators on the process) to the key have been freed. These references need to be explicitly freed by the program, either via calls to MPI_Attr_delete that free one attribute instance, or by calls to MPI_Comm_free that free all attribute instances associated with the freed communicator.

17.2.250.5. NOTE

Key values are global (they can be used with any and all communicators).

17.2.250.6. 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.