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bin/gems/concurrent-ruby-1.3.5/lib/concurrent-ruby/concurrent/set.rb

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+require 'concurrent/utility/engine'
+require 'concurrent/thread_safe/util'
+require 'set'
+
+module Concurrent
+
+  # @!macro concurrent_set
+  #
+  #   A thread-safe subclass of Set. This version locks against the object
+  #   itself for every method call, ensuring only one thread can be reading
+  #   or writing at a time. This includes iteration methods like `#each`.
+  #
+  #   @note `a += b` is **not** a **thread-safe** operation on
+  #     `Concurrent::Set`. It reads Set `a`, then it creates new `Concurrent::Set`
+  #     which is union of `a` and `b`, then it writes the union to `a`.
+  #     The read and write are independent operations they do not form a single atomic
+  #     operation therefore when two `+=` operations are executed concurrently updates
+  #     may be lost. Use `#merge` instead.
+  #
+  #   @see http://ruby-doc.org/stdlib-2.4.0/libdoc/set/rdoc/Set.html Ruby standard library `Set`
+
+  # @!macro internal_implementation_note
+  SetImplementation = case
+                      when Concurrent.on_cruby?
+                        # The CRuby implementation of Set is written in Ruby itself and is
+                        # not thread safe for certain methods.
+                        require 'monitor'
+                        require 'concurrent/thread_safe/util/data_structures'
+
+                        class CRubySet < ::Set
+                        end
+
+                        ThreadSafe::Util.make_synchronized_on_cruby CRubySet
+                        CRubySet
+
+                      when Concurrent.on_jruby?
+                        require 'jruby/synchronized'
+
+                        class JRubySet < ::Set
+                          include JRuby::Synchronized
+                        end
+
+                        JRubySet
+
+                      when Concurrent.on_truffleruby?
+                        require 'concurrent/thread_safe/util/data_structures'
+
+                        class TruffleRubySet < ::Set
+                        end
+
+                        ThreadSafe::Util.make_synchronized_on_truffleruby TruffleRubySet
+                        TruffleRubySet
+
+                      else
+                        warn 'Possibly unsupported Ruby implementation'
+                        ::Set
+                      end
+  private_constant :SetImplementation
+
+  # @!macro concurrent_set
+  class Set < SetImplementation
+  end
+end
+