attrs(3p) Perl Programmers Reference Guide attrs(3p)NAMEattrs - set/get attributes of a subroutine (deprecated)
SYNOPSIS
sub foo {
use attrs qw(locked method);
...
}
@a = attrs::get(\&foo);
DESCRIPTION
NOTE: Use of this pragma is deprecated. Use the syntax
sub foo : locked method { }
to declare attributes instead. See also attributes.
This pragma lets you set and get attributes for subroutines.
Setting attributes takes place at compile time; trying to
set invalid attribute names causes a compile-time error.
Calling "attrs::get" on a subroutine reference or name
returns its list of attribute names. Notice that
"attrs::get" is not exported. Valid attributes are as fol-
lows.
method
Indicates that the invoking subroutine is a method.
locked
Setting this attribute is only meaningful when the sub-
routine or method is to be called by multiple threads.
When set on a method subroutine (i.e. one marked with
the method attribute above), perl ensures that any invo-
cation of it implicitly locks its first argument before
execution. When set on a non-method subroutine, perl
ensures that a lock is taken on the subroutine itself
before execution. The semantics of the lock are exactly
those of one explicitly taken with the "lock" operator
immediately after the subroutine is entered.
perl v5.8.8 2005-02-05 1
