"Locker" is lockable box for equipment -- at this case box for collecting the callbacks (in its locked state) and running them after unlocking. So, in fact, it serves as some kind of callback semaphore or mutex.
Some trivial example:
require "callback-locker"
locker = CallbackLocker::new
foo = nil
locker.synchronize do
foo = "bar"
end
# ^^^ locker is unlocked, so #synchronize will execute callback
# immediately
foo = nil
locker.lock!
locker.synchronize do
foo = "1"
end
locker.synchronize do
foo << "2"
end
locker.unlock!
# ^^^ locker is locked, so callbacks are stacked and executed
# immediately after the #unlock! method is call, so foo
# will contain "12"Copyright © 2011 – 2015 Martin Poljak. See LICENSE.txt for
further details.