Class | ConditionVariable |
In: |
lib/thread.rb
|
Parent: | Object |
ConditionVariable objects augment class Mutex. Using condition variables, it is possible to suspend while in the middle of a critical section until a resource becomes available.
Example:
require 'thread' mutex = Mutex.new resource = ConditionVariable.new a = Thread.new { mutex.synchronize { # Thread 'a' now needs the resource resource.wait(mutex) # 'a' can now have the resource } } b = Thread.new { mutex.synchronize { # Thread 'b' has finished using the resource resource.signal } }
Creates a new ConditionVariable
# File lib/thread.rb, line 187 def initialize @waiters = [] end
Wakes up all threads waiting for this lock.
# File lib/thread.rb, line 220 def broadcast waiters0 = nil Thread.exclusive do waiters0 = @waiters.dup @waiters.clear end for t in waiters0 begin t.run rescue ThreadError end end end
Wakes up the first thread in line waiting for this lock.
# File lib/thread.rb, line 208 def signal begin t = @waiters.shift t.run if t rescue ThreadError retry end end