attrs(3perl) - phpMan

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



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                                2011-06-30                               attrs(3perl)

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