[ruby-core:57620] [CommonRuby - Feature #8961] Synchronizable module to easily wrap methods in a mutex

Issue #8961 has been updated by headius (Charles Nutter).


tobiassvn (Tobias Svensson) wrote:
> I suppose if this is being added to MonitorMixin it should probably be in Mutex_m as well?

I don't think so, since a Mutex is not reentrant and what we want is monitor semantics for #synchronized.
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Feature #8961: Synchronizable module to easily wrap methods in a mutex
https://bugs.ruby-lang.org/issues/8961#change-42233

Author: tobiassvn (Tobias Svensson)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


=begin
I propose a Synchronizable mixin to easily wrap methods in a mutex which works together with Ruby 2.1's method name symbols returned from '(({def}))'.

The Mixin adds a new '(({synchronized}))' class method which would alias the referenced method and redefines the original method wrapped in a '(({synchronize do .. end}))' block.

This is probably somewhat related and an alternative to #8556.

---

Proof of concept (I've used Monitor here so potential users won't have to worry about reentrancy):

  require 'monitor'
   
  module Synchronizable
    module ClassMethods
      def synchronized(method)
        aliased = :"#{method}_without_synchronization"
        alias_method aliased, method
   
        define_method method do |*args, &block|
          monitor.synchronize do
            __send__(aliased, *args, &block)
          end
        end
      end
    end
   
    def monitor
      @monitor ||= Monitor.new
    end
   
    def self.included(base)
      base.extend(ClassMethods)
    end
  end
   
  class Foo
    include Synchronizable
   
    synchronized def bar
      # ...
    end
  end
=end



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