PriorityInheritance

java.lang.Object
- javax.realtime.MonitorControl
- - javax.realtime.PriorityInheritance

```
public class PriorityInheritance
extends MonitorControl
```
Singleton class specifying use of the priority inheritance protocol. When a thread or schedulable t1 attempts to enter code that is synchronized on an object obj governed by this protocol, and obj is currently locked by a lower-priority thread or schedulable t2, then
1. When t1's active priority does not exceed the maximum priority allowed by t2's scheduler, then t1 becomes a priority source for t2; t1 ceases to serve as a priority source for t2 when either t2 releases the lock on obj, or t1 ceases attempting to synchronize on obj (e.g., when t1 incurs an ATC).
2. Otherwise (i.e., t1's active priority exceeds the maximum priority allowed by t2's scheduler), an IllegalTaskStateException is thrown in t1.
Note on the second rule, throwing the exception in t1, rather than in t2, ensures that the exception is synchronous.
See also MonitorControl and PriorityCeilingEmulation

- Method Summary
  
  All Methods Static Methods Concrete Methods
  Modifier and Type Method and Description
  
  static PriorityInheritance instance()
  Obtains a reference to the singleton PriorityInheritance.
  - Methods inherited from class javax.realtime.MonitorControl
    getMonitorControl, getMonitorControl, setMonitorControl, setMonitorControl
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - instance
```
public static PriorityInheritance instance()
```
    Obtains a reference to the singleton PriorityInheritance.
    This is the default MonitorControl policy in effect at system startup.
    The PriorityInheritance instance shall be allocated in ImmortalMemory.