| Class | Queue |
| In: |
thread.rb
|
| Parent: | Object |
This class provides a way to synchronize communication between threads.
Example:
require 'thread'
queue = Queue.new
producer = Thread.new do
5.times do |i|
sleep rand(i) # simulate expense
queue << i
puts "#{i} produced"
end
end
consumer = Thread.new do
5.times do |i|
value = queue.pop
sleep rand(i/2) # simulate expense
puts "consumed #{value}"
end
end
consumer.join
Creates a new queue.
# File thread.rb, line 271 def initialize @que = [] @waiting = [] @que.taint # enable tainted comunication @waiting.taint self.taint end
Returns the number of threads waiting on the queue.
# File thread.rb, line 364 def num_waiting @waiting.size end
Retrieves data from the queue. If the queue is empty, the calling thread is suspended until data is pushed onto the queue. If non_block is true, the thread isn’t suspended, and an exception is raised.
# File thread.rb, line 314 def pop(non_block=false) while (Thread.critical = true; @que.empty?) raise ThreadError, "queue empty" if non_block @waiting.push Thread.current Thread.stop end @que.shift ensure Thread.critical = false end