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
lockoperator immediately after the subroutine is entered.

