com.oracle.svm.core.thread

Class VMThreads.SafepointBehavior

java.lang.Object

com.oracle.svm.core.thread.VMThreads.SafepointBehavior

Enclosing class:

VMThreads

public static class VMThreads.SafepointBehavior
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	ALLOW_SAFEPOINT The thread will freeze as soon as possible if a safepoint is requested.

Constructor Summary

Constructors

Constructor and Description
SafepointBehavior()

Method Summary

Modifier and Type	Method and Description
static int	getSafepointBehaviorVolatile(org.graalvm.nativeimage.IsolateThread vmThread)
static boolean	ignoresSafepoints()
static boolean	ignoresSafepoints(org.graalvm.nativeimage.IsolateThread vmThread)
static void	markThreadAsCrashed() Marks the thread as crashed.
static void	preventSafepoints() Changes the safepoint behavior so that this thread won't freeze at a safepoint.
static String	toString(int safepointBehavior)

Methods inherited from class java.lang.Object

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

Field Detail

ALLOW_SAFEPOINT

public static final int ALLOW_SAFEPOINT

The thread will freeze as soon as possible if a safepoint is requested.

See Also:

Constant Field Values

Constructor Detail

SafepointBehavior

public SafepointBehavior()

Method Detail

ignoresSafepoints

public static boolean ignoresSafepoints()

ignoresSafepoints

public static boolean ignoresSafepoints(org.graalvm.nativeimage.IsolateThread vmThread)

getSafepointBehaviorVolatile

public static int getSafepointBehaviorVolatile(org.graalvm.nativeimage.IsolateThread vmThread)

preventSafepoints

public static void preventSafepoints()

Changes the safepoint behavior so that this thread won't freeze at a safepoint. The thread will also actively prevent the VM from reaching a safepoint (regardless of its thread status). NOTE: Be careful with this method and make sure that this thread does not allocate any Java objects as this could result deadlocks. This method will only work prevent safepoints reliably if it is called from a thread with VMThreads.StatusSupport.STATUS_IN_JAVA.

markThreadAsCrashed

public static void markThreadAsCrashed()

Marks the thread as crashed. This method may only be used in places where it is not possible to safely detach a thread. Changes the safepoint behavior so that this thread won't freeze at a safepoint. The safepoint handling will ignore the thread so that the VM can reach a safepoint regardless of the status of this thread. NOTE: Be careful with this. If a thread is ignored by the safepoint handling, it means that it can continue executing while a safepoint (and therefore a GC) is in progress. So, make sure that this thread does not allocate or access any movable heap objects (even executing write barriers can already cause issues).

toString

public static String toString(int safepointBehavior)