Add bin and edit workflow

bin/gems/async-2.23.0/lib/async/condition.rb

@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2017-2024, by Samuel Williams.
+# Copyright, 2017, by Kent Gruber.
+
+require "fiber"
+require_relative "list"
+
+module Async
+	# A synchronization primitive, which allows fibers to wait until a particular condition is (edge) triggered.
+	# @public Since *Async v1*.
+	class Condition
+		# Create a new condition.
+		def initialize
+			@waiting = List.new
+		end
+		
+		class FiberNode < List::Node
+			def initialize(fiber)
+				@fiber = fiber
+			end
+			
+			def transfer(*arguments)
+				@fiber.transfer(*arguments)
+			end
+			
+			def alive?
+				@fiber.alive?
+			end
+		end
+		
+		private_constant :FiberNode
+		
+		# Queue up the current fiber and wait on yielding the task.
+		# @returns [Object]
+		def wait
+			@waiting.stack(FiberNode.new(Fiber.current)) do
+				Fiber.scheduler.transfer
+			end
+		end
+		
+		# @deprecated Replaced by {#waiting?}
+		def empty?
+			@waiting.empty?
+		end
+		
+		# @returns [Boolean] Is any fiber waiting on this notification?
+		def waiting?
+			@waiting.size > 0
+		end
+		
+		# Signal to a given task that it should resume operations.
+		# @parameter value [Object | Nil] The value to return to the waiting fibers.
+		def signal(value = nil)
+			return if @waiting.empty?
+			
+			waiting = self.exchange
+			
+			waiting.each do |fiber|
+				Fiber.scheduler.resume(fiber, value) if fiber.alive?
+			end
+			
+			return nil
+		end
+		
+		protected
+		
+		def exchange
+			waiting = @waiting
+			@waiting = List.new
+			return waiting
+		end
+	end
+end