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NAME
MPI_Keyval_free - Frees attribute key for communicator cache attribute
-- use of this routine is deprecated.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Keyval_free(int *keyval)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_KEYVAL_FREE(KEYVAL, IERROR)
INTEGER KEYVAL, IERROR
INPUT PARAMETER
keyval Frees the integer key value (integer).
OUTPUT PARAMETER
IERROR Fortran only: Error status (integer).
DESCRIPTION
Note that use of this routine is deprecated as of MPI-2. Please use
MPI_Comm_free_keyval instead.
This deprecated routine is not available in C++.
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 tran-
spire until after all references (in other communicators on the
process) to the key have been freed. These references need to be
explictly 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.
NOTE
Key values are global (they can be used with any and all communica-
tors).
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++ func-
tions 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
1.3.4 Nov 11, 2009 MPI_Keyval_free(3)
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