Class: Async::Condition

Inherits:
Object
  • Object
show all
Defined in:
lib/async/condition.rb

Overview

A synchronization primitive, which allows fibers to wait until a particular condition is (edge) triggered.

Direct Known Subclasses

Notification

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Condition

Returns a new instance of Condition.



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# File 'lib/async/condition.rb', line 14

def initialize
  @waiting = List.new
end

Instance Method Details

#empty? ⇒ Boolean

Is any fiber waiting on this notification?

Returns:

  • (Boolean) 


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# File 'lib/async/condition.rb', line 44

def empty?
  @waiting.empty?
end

#signal(value = nil) ⇒ Object

Signal to a given task that it should resume operations.



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# File 'lib/async/condition.rb', line 50

def signal(value = nil)
  return if @waiting.empty?
  
  waiting = self.exchange
  
  waiting.each do |fiber|
    Fiber.scheduler.resume(fiber, value) if fiber.alive?
  end
  
  return nil
end

#wait ⇒ Object

Queue up the current fiber and wait on yielding the task.



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# File 'lib/async/condition.rb', line 36

def wait
  @waiting.stack(FiberNode.new(Fiber.current)) do
    Fiber.scheduler.transfer
  end
end