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



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 v5.10.0                                     2007-12-18                                       attrs(3pm)