Monitor (OS)
Monitor is a software module that uses condition variables for signalling.
- Unused signals are lost (!= semaphores)
Chief characteristics
- Local data variables are accessible only by the monitor (⇒ shared data in monitor is “safe”)
- Process enters monitor by invoking one of its procedures (⇒ controlled entry)
- Only one process may be executing in the monitor at a time (⇒ mutex)
