dRuby

• pass by reference
• pass by value

to pass odba_id from Oddbd main Process to another working process(like exportd).

lock / unlock

• Thread.exclusive
  • Thread.critical
  • Thread.critical=
• Mutex (mutual exclusion)
  • Mutex.synchronize
    • Mutex.lock
    • Mutex.unlock
  • take care to check dead lock (Don't call Mutex.synchronize in same thread)
• Monitor, MonitorMixin