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# Poor Man's Fiber (API compatible Thread based Fiber implementation for Ruby 1.8)
# (c) 2008 Aman Gupta (tmm1)
unless defined? Fiber
require 'thread'
class FiberError < StandardError; # :nodoc:
end
class Fiber # :nodoc:
def initialize
raise ArgumentError, 'new Fiber requires a block' unless block_given?
@yield = Queue.new
@resume = Queue.new
@thread = Thread.new{ @yield.push [yield(*@resume.pop)] }
@thread.abort_on_exception = true
@thread[:fiber] = self
end
attr_reader :thread
def resume *args
raise FiberError, 'dead fiber called' unless @thread.alive?
@resume.push(args)
result = @yield.pop
result.size > 1 ? result : result.first
end
def yield *args
@yield.push(args)
result = @resume.pop
result.size > 1 ? result : result.first
end
def self.yield *args
if fiber = Thread.current[:fiber]
fiber.yield(*args)
else
raise FiberError, 'not inside a fiber'
end
end
def self.current
if Thread.current == Thread.main
return Thread.main[:fiber] ||= RootFiber.new
end
Thread.current[:fiber] or raise FiberError, 'not inside a fiber'
end
def inspect
"#<#{self.class}:0x#{self.object_id.to_s(16)}>"
end
end
class RootFiber < Fiber # :nodoc:
def initialize
# XXX: what is a root fiber anyway?
end
def self.yield *args
raise FiberError, "can't yield from root fiber"
end
end
end
Version data entries
7 entries across 6 versions & 2 rubygems