The only currently recognized attribute is C<unique> which indicates
that a single copy of the global is to be used by all interpreters
should the program happen to be running in a multi-interpreter
-environment. (The default behaviour would be for each interpreter to
-have its own copy of the global.) In such an environment, this
-attribute also has the effect of making the global readonly.
-Examples:
+environment. (The default behaviour would be for each interpreter
+to have its own copy of the global.) Examples:
our @EXPORT : unique = qw(foo);
our %EXPORT_TAGS : unique = (bar => [qw(aa bb cc)]);
our $VERSION : unique = "1.00";
+Note that this attribute also has the effect of making the global
+readonly when the first new interpreter is cloned.
+
Multi-interpreter environments can come to being either through the
fork() emulation on Windows platforms, or by embedding perl in a
multi-threaded application. The C<unique> attribute does nothing in