JezK
Edit File: fallback.rb
# Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. require 'thread' require 'atomic/direct_update' # Portable/generic (but not very memory or scheduling-efficient) fallback class Atomic #:nodoc: all def initialize(value = nil) @mutex = Mutex.new @value = value end def get @mutex.synchronize { @value } end alias value get def set(new_value) @mutex.synchronize { @value = new_value } end alias value= set def get_and_set(new_value) @mutex.synchronize do old_value = @value @value = new_value old_value end end alias swap get_and_set def compare_and_set(old_value, new_value) return false unless @mutex.try_lock begin return false unless @value.equal? old_value @value = new_value ensure @mutex.unlock end true end require 'atomic/numeric_cas_wrapper' end