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ruby18
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ruby
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1.8
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Filename :
mutex_m.rb
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#-- # mutex_m.rb - # $Release Version: 3.0$ # $Revision: 1.7 $ # $Date: 1998/02/27 04:28:57 $ # Original from mutex.rb # by Keiju ISHITSUKA(keiju@ishitsuka.com) # modified by matz # patched by akira yamada #++ # # == Usage # # Extend an object and use it like a Mutex object: # # require "mutex_m.rb" # obj = Object.new # obj.extend Mutex_m # # ... # # Or, include Mutex_m in a class to have its instances behave like a Mutex # object: # # class Foo # include Mutex_m # # ... # end # # obj = Foo.new module Mutex_m def Mutex_m.define_aliases(cl) cl.module_eval %q{ alias locked? mu_locked? alias lock mu_lock alias unlock mu_unlock alias try_lock mu_try_lock alias synchronize mu_synchronize } end def Mutex_m.append_features(cl) super define_aliases(cl) unless cl.instance_of?(Module) end def Mutex_m.extend_object(obj) super obj.mu_extended end def mu_extended unless (defined? locked? and defined? lock and defined? unlock and defined? try_lock and defined? synchronize) Mutex_m.define_aliases(class<<self;self;end) end mu_initialize end # locking def mu_synchronize begin mu_lock yield ensure mu_unlock end end def mu_locked? @mu_locked end def mu_try_lock result = false Thread.critical = true unless @mu_locked @mu_locked = true result = true end Thread.critical = false result end def mu_lock while (Thread.critical = true; @mu_locked) @mu_waiting.push Thread.current Thread.stop end @mu_locked = true Thread.critical = false self end def mu_unlock return unless @mu_locked Thread.critical = true wait = @mu_waiting @mu_waiting = [] @mu_locked = false Thread.critical = false for w in wait w.run end self end private def mu_initialize @mu_waiting = [] @mu_locked = false; end def initialize(*args) mu_initialize super end end