Monitor

Monitors provide means of mutual exclusion for Thread programming. A critical region is created by means of the synchronize method, which takes a block. The condition variables (created with #new_cond) may be used to control the execution of a monitor with #signal and #wait.

the Monitor class wraps MonitorMixin, and provides aliases

 alias try_enter try_mon_enter
 alias enter mon_enter
 alias exit mon_exit

to access its methods more concisely.