| Class | ConditionVariable |
| In: |
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 thread.rb, line 192 def initialize @waiters = [] end
Wakes up all threads waiting for this lock.
# File thread.rb, line 225 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 thread.rb, line 213 def signal begin t = @waiters.shift t.run if t rescue ThreadError retry end end