com.oracle.svm.core.thread

Class ParkEvent

java.lang.Object

com.oracle.svm.core.thread.ParkEvent

public abstract class ParkEvent
extends Object

Each VMThread will have one of these on which to wait.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ParkEvent.ParkEventFactory
static class	ParkEvent.WaitResult

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	event The ticket: false implies unavailable, true implies available.
protected boolean	resetEventBeforeWait When true, calls to ParkEvent.condWait() and ParkEvent.condTimedWait(long) will always wait, even a previous call to ParkEvent.unpark() had not been consumed by a wait yet (the semantics of Thread.sleep(long)).

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ParkEvent() Constructor for subclasses.

Method Summary

Modifier and Type	Method and Description
protected abstract ParkEvent.WaitResult	condTimedWait(long delayNanos) cond_timedwait, similar to ParkEvent.condWait() but with a timeout in nanoseconds.
protected abstract ParkEvent.WaitResult	condWait()
protected static void	release(ParkEvent event)
protected abstract void	unpark() Notify anyone waiting on this event.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

event

protected boolean event

The ticket: false implies unavailable, true implies available. No need to be volatile, because it is read and written only when the mutex is held, or before a reference to this ParkEvent is handed out.

resetEventBeforeWait

protected boolean resetEventBeforeWait

When true, calls to ParkEvent.condWait() and ParkEvent.condTimedWait(long) will always wait, even a previous call to ParkEvent.unpark() had not been consumed by a wait yet (the semantics of Thread.sleep(long)). When false, ParkEvent.condWait() and ParkEvent.condTimedWait(long) will return immediately when a previous call to ParkEvent.unpark() has happend (the semantics of Unsafe.park(boolean, long)).

Constructor Detail

ParkEvent

protected ParkEvent()

Constructor for subclasses.

Method Detail

condWait

protected abstract ParkEvent.WaitResult condWait()

condTimedWait

protected abstract ParkEvent.WaitResult condTimedWait(long delayNanos)

cond_timedwait, similar to ParkEvent.condWait() but with a timeout in nanoseconds.

unpark

protected abstract void unpark()

Notify anyone waiting on this event.

release

protected static void release(ParkEvent event)