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NAME
MPI_Comm_free_keyval - Frees attribute key for communicator cache
attribute.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Comm_free_keyval(int *comm_keyval)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_COMM_FREE_KEYVAL(COMM_KEYVAL, IERROR)
INTEGER COMM_KEYVAL, IERROR
C++ Syntax
#include <mpi.h>
static void MPI::Comm::Free_keyval(int& comm_keyval)
INPUT/OUTPUT PARAMETER
comm_keyval
OUTPUT PARAMETER
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_Comm_free_keyval frees an extant attribute key. This function sets
the value of keyval to MPI_KEYVAL_INVALID. Note that it is not erro-
neous 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
explictly freed by the program, either via calls to
MPI_Comm_delete_attr that free one attribute instance, or by calls to
MPI_Comm_free that free all attribute instances associated with the
freed communicator.
This call is identical to the call MPI_Keyval_free but is needed to
match the communicator-specific creation function introduced in the
MPI-2 standard. The use of MPI_Keyval_free is deprecated.
NOTES
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
1.3.4 Nov 11, 2009 MPI_Comm_free_keyval(3)
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