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=item $rc = mm_permission($mm, $mode, $owner, $group)

This method sets the filesystem mode, owner, and group for the shared
memory segment mm. It will only do anything when the underlying shared
memory segment is based on files. It corresponds to the function in B<mm>
of the same name.

I<$mm> is the shared memory segment returned by I<mm_create>.

I<$mode>, I<$owner>, and I<$group> are passed directly to chown and chmod.

=item mm_destroy($mm)

This method destroys a shared memory segment created by I<mm_create>.

I<$mm> is the shared memory segment returned by I<mm_create>.

=item $scalar = mm_make_scalar($mm)

=item mm_free_scalar($scalar)