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|
#
# thread.rb - thread support classes
# $Date$
# by Yukihiro Matsumoto <matz@caelum.co.jp>
#
unless defined? Thread
fail "Thread not available for this ruby interpreter"
end
unless defined? ThreadError
class ThreadError<Exception
end
end
if $DEBUG
Thread.abort_on_exception = true
end
class Mutex
def initialize
@waiting = []
@locked = FALSE;
end
def locked?
@locked
end
def try_lock
result = FALSE
Thread.critical = TRUE
unless @locked
@locked = TRUE
result = TRUE
end
Thread.critical = FALSE
result
end
def lock
while (Thread.critical = TRUE; @locked)
@waiting.push Thread.current
Thread.stop
end
@locked = TRUE
Thread.critical = FALSE
self
end
def unlock
return unless @locked
Thread.critical = TRUE
wait = @waiting
@waiting = []
@locked = FALSE
Thread.critical = FALSE
for w in wait
w.run
end
self
end
def synchronize
begin
lock
yield
ensure
unlock
end
end
end
class Queue
def initialize
@que = []
@waiting = []
end
def push(obj)
Thread.critical = TRUE
@que.push obj
t = @waiting.shift
Thread.critical = FALSE
t.run if t
end
def pop non_block=FALSE
item = nil
until item
Thread.critical = TRUE
if @que.length == 0
if non_block
Thread.critical = FALSE
raise ThreadError, "queue empty"
end
@waiting.push Thread.current
Thread.stop
else
item = @que.shift
end
end
Thread.critical = FALSE
item
end
def empty?
@que.length == 0
end
def length
@que.length
end
alias size length
end
class SizedQueue<Queue
def initialize(max)
@max = max
@queue_wait = []
super()
end
def push(obj)
while @que.length >= @max
@queue_wait.push Thread.current
Thread.stop
end
super
end
def pop(*args)
if @que.length < @max
t = @queue_wait.shift
t.run if t
end
pop = super
pop
end
end
|
