/usr/lib/ruby/vendor_ruby/celluloid/future.rb is in ruby-celluloid 0.16.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | require 'thread'
module Celluloid
# Celluloid::Future objects allow methods and blocks to run in the
# background, their values requested later
class Future
def self.new(*args, &block)
return super unless block
future = new
Celluloid::ThreadHandle.new(Celluloid.actor_system, :future) do
begin
call = SyncCall.new(future, :call, args)
call.dispatch(block)
rescue
# Exceptions in blocks will get raised when the value is retrieved
end
end
future
end
attr_reader :address
def initialize
@address = Celluloid.uuid
@mutex = Mutex.new
@ready = false
@result = nil
@forwards = nil
end
# Check if this future has a value yet
def ready?
@ready
end
# Obtain the value for this Future
def value(timeout = nil)
ready = result = nil
begin
@mutex.lock
if @ready
ready = true
result = @result
else
case @forwards
when Array
@forwards << Celluloid.mailbox
when NilClass
@forwards = Celluloid.mailbox
else
@forwards = [@forwards, Celluloid.mailbox]
end
end
ensure
@mutex.unlock
end
unless ready
result = Celluloid.receive(timeout) do |msg|
msg.is_a?(Future::Result) && msg.future == self
end
end
if result
result.value
else
raise TimeoutError, "Timed out"
end
end
alias_method :call, :value
# Signal this future with the given result value
def signal(value)
result = Result.new(value, self)
@mutex.synchronize do
raise "the future has already happened!" if @ready
if @forwards
@forwards.is_a?(Array) ? @forwards.each { |f| f << result } : @forwards << result
end
@result = result
@ready = true
end
end
alias_method :<<, :signal
# Inspect this Celluloid::Future
alias_method :inspect, :to_s
# Wrapper for result values to distinguish them in mailboxes
class Result
attr_reader :future
def initialize(result, future)
@result, @future = result, future
end
def value
@result.value
end
end
end
end
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