# Copyright 2015 gRPC authors. # # 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. # GRPC contains the General RPC module. module GRPC # Notifier is useful high-level synchronization primitive. class Notifier attr_reader :payload, :notified alias_method :notified?, :notified def initialize @mutex = Mutex.new @cvar = ConditionVariable.new @notified = false @payload = nil end def wait @mutex.synchronize do @cvar.wait(@mutex) until notified? end end def notify(payload) @mutex.synchronize do return Error.new('already notified') if notified? @payload = payload @notified = true @cvar.signal return nil end end end end