


attrs(3p)        Perl Programmers Reference Guide       attrs(3p)


NAME
       attrs - 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 follows.

       method
           Indicates that the invoking subroutine is a method.

       locked
           Setting this attribute is only meaningful when the
           subroutine 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 invocation 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 v5.10.1                2009-10-12                          1


