Class: SyncQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/devp2p/sync_queue.rb

Overview

A naive synchronized queue for Celluloid actors.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SyncQueue

Returns a new instance of SyncQueue.



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# File 'lib/devp2p/sync_queue.rb', line 8

def initialize
  @queue = []
  @num_waiting = 0
  @cond = Celluloid::Condition.new
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/devp2p/sync_queue.rb', line 63

def clear
  @queue.clear
end

#deq(non_block = false) ⇒ Object 



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# File 'lib/devp2p/sync_queue.rb', line 20

def deq(non_block=false)
  loop do
    if @queue.empty?
      if non_block
        raise ThreadError, 'queue empty'
      else
        begin
          @num_waiting += 1
          @cond.wait
        ensure
          @num_waiting -= 1
        end
      end
    else
      return @queue.shift
    end
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/devp2p/sync_queue.rb', line 59

def empty?
  @queue.empty?
end

#enq(obj) ⇒ Object Also known as: << 



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# File 'lib/devp2p/sync_queue.rb', line 14

def enq(obj)
  @queue.push obj
  @cond.signal
end

#length ⇒ Object Also known as: size 



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# File 'lib/devp2p/sync_queue.rb', line 67

def length
  @queue.length
end

#num_waiting ⇒ Object

Returns the number of threads waiting on the queue.



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# File 'lib/devp2p/sync_queue.rb', line 73

def num_waiting
  @num_waiting
end

#peek(non_block = false) ⇒ Object

Same as pop except it will not remove the element from queue, just peek.



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# File 'lib/devp2p/sync_queue.rb', line 40

def peek(non_block=false)
  loop do
    if @queue.empty?
      if non_block
        raise ThreadError, 'queue empty'
      else
        begin
          @num_waiting += 1
          @cond.wait
        ensure
          @num_waiting -= 1
        end
      end
    else
      return @queue[0]
    end
  end
end