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module Celluloid
class ConditionError < Celluloid::Error; end
# ConditionVariable-like signaling between tasks and threads
class Condition
class Waiter
def initialize(condition, task, mailbox)
@condition = condition
@task = task
@mailbox = mailbox
end
attr_reader :condition, :task
def <<(message)
@mailbox << message
end
def wait
message = @mailbox.receive do |msg|
msg.is_a?(SignalConditionRequest) && msg.task == Thread.current
end
message.value
end
end
def initialize
@mutex = Mutex.new
@waiters = []
end
# Wait for the given signal and return the associated value
def wait
raise ConditionError, "cannot wait for signals while exclusive" if Celluloid.exclusive?
if Thread.current[:celluloid_actor]
task = Task.current
else
task = Thread.current
end
waiter = Waiter.new(self, task, Celluloid.mailbox)
@mutex.synchronize do
@waiters << waiter
end
result = Celluloid.suspend :condwait, waiter
raise result if result.is_a? ConditionError
result
end
# Send a signal to the first task waiting on this condition
def signal(value = nil)
@mutex.synchronize do
if waiter = @waiters.shift
waiter << SignalConditionRequest.new(waiter.task, value)
else
Logger.debug("Celluloid::Condition signaled spuriously")
end
end
end
# Broadcast a value to all waiting tasks and threads
def broadcast(value = nil)
@mutex.synchronize do
@waiters.each { |waiter| waiter << SignalConditionRequest.new(waiter.task, value) }
@waiters.clear
end
end
alias_method :inspect, :to_s
end
end
Version data entries
6 entries across 6 versions & 2 rubygems