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

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+require 'concurrent/utility/engine'
+require 'concurrent/thread_safe/util'
+
+module Concurrent
+
+  # @!macro concurrent_array
+  #
+  #   A thread-safe subclass of Array. 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::Array`. It reads array `a`, then it creates new `Concurrent::Array`
+  #     which is concatenation of `a` and `b`, then it writes the concatenation 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 `#concat` instead.
+  #
+  #   @see http://ruby-doc.org/core/Array.html Ruby standard library `Array`
+
+  # @!macro internal_implementation_note
+  ArrayImplementation = case
+                        when Concurrent.on_cruby?
+                          # Array is not fully thread-safe on CRuby, see
+                          # https://github.com/ruby-concurrency/concurrent-ruby/issues/929
+                          # So we will need to add synchronization here
+                          ::Array
+
+                        when Concurrent.on_jruby?
+                          require 'jruby/synchronized'
+
+                          class JRubyArray < ::Array
+                            include JRuby::Synchronized
+                          end
+                          JRubyArray
+
+                        when Concurrent.on_truffleruby?
+                          require 'concurrent/thread_safe/util/data_structures'
+
+                          class TruffleRubyArray < ::Array
+                          end
+
+                          ThreadSafe::Util.make_synchronized_on_truffleruby TruffleRubyArray
+                          TruffleRubyArray
+
+                        else
+                          warn 'Possibly unsupported Ruby implementation'
+                          ::Array
+                        end
+  private_constant :ArrayImplementation
+
+  # @!macro concurrent_array
+  class Array < ArrayImplementation
+  end
+
+end