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GraalVM is an ecosystem for compiling and running applications written in multiple languages.
GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime.
/*
* Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
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* without restriction, including without limitation the rights to copy, create
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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* This license is subject to the following condition:
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* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package org.graalvm.nativeimage;
import java.util.Objects;
import org.graalvm.nativeimage.impl.IsolateSupport;
import org.graalvm.word.UnsignedWord;
/**
* Support for the creation, access to, and tear-down of isolates.
*
* @since 19.0
*/
public final class Isolates {
private Isolates() {
}
/**
* An exception thrown in the context of managing isolates.
*
* @since 19.0
*/
public static final class IsolateException extends RuntimeException {
private static final long serialVersionUID = 1L;
/**
* Constructs a new exception with the specified detail message.
*
* @since 19.0
*/
public IsolateException(String message) {
super(message);
}
}
/**
* Parameters for the creation of an isolate.
*
* @see CreateIsolateParameters.Builder
*
* @since 19.0
*/
public static final class CreateIsolateParameters {
/**
* Builder for a {@link CreateIsolateParameters} instance.
*
* @since 19.0
*/
public static final class Builder {
private UnsignedWord reservedAddressSpaceSize;
private String auxiliaryImagePath;
private UnsignedWord auxiliaryImageReservedSpaceSize;
/**
* Creates a new builder with default values.
*
* @since 19.0
*/
public Builder() {
}
/**
* Sets the size in bytes for the reserved virtual address space of the new isolate.
*
* @since 19.0
*/
public Builder reservedAddressSpaceSize(UnsignedWord size) {
this.reservedAddressSpaceSize = size;
return this;
}
/**
* Sets the file path to an auxiliary image which should be loaded in addition to the
* main image, or {@code null} if no such image should be loaded.
*
* @since 20.1
*/
public Builder auxiliaryImagePath(String filePath) {
this.auxiliaryImagePath = filePath;
return this;
}
/**
* Sets the size in bytes of an address space to reserve for loading an auxiliary image
* in addition to the main image, or 0 if no space should be reserved.
*
* @since 20.1
*/
public Builder auxiliaryImageReservedSpaceSize(UnsignedWord size) {
this.auxiliaryImageReservedSpaceSize = size;
return this;
}
/**
* Produces the final {@link CreateIsolateParameters} with the values set previously by
* the builder methods.
*
* @since 19.0
*/
public CreateIsolateParameters build() {
return new CreateIsolateParameters(reservedAddressSpaceSize, auxiliaryImagePath, auxiliaryImageReservedSpaceSize);
}
}
private static final CreateIsolateParameters DEFAULT = new Builder().build();
/**
* Returns a {@link CreateIsolateParameters} with all default values.
*
* @since 19.0
*/
public static CreateIsolateParameters getDefault() {
return DEFAULT;
}
private final UnsignedWord reservedAddressSpaceSize;
private final String auxiliaryImagePath;
private final UnsignedWord auxiliaryImageReservedSpaceSize;
private CreateIsolateParameters(UnsignedWord reservedAddressSpaceSize, String auxiliaryImagePath, UnsignedWord auxiliaryImageReservedSpaceSize) {
this.reservedAddressSpaceSize = reservedAddressSpaceSize;
this.auxiliaryImagePath = auxiliaryImagePath;
this.auxiliaryImageReservedSpaceSize = auxiliaryImageReservedSpaceSize;
}
/**
* Returns the size in bytes for the reserved virtual address space of the new isolate.
*
* @since 19.0
*/
public UnsignedWord getReservedAddressSpaceSize() {
return reservedAddressSpaceSize;
}
/**
* Returns the file path to an auxiliary image which should be loaded in addition to the
* main image, or {@code null} if no such image should be loaded.
*
* @since 20.1
*/
public String getAuxiliaryImagePath() {
return auxiliaryImagePath;
}
/**
* Returns the size in bytes of an address space to reserve for loading an auxiliary image
* in addition to the main image, or 0 if no space should be reserved.
*
* @since 20.1
*/
public UnsignedWord getAuxiliaryImageReservedSpaceSize() {
return auxiliaryImageReservedSpaceSize;
}
}
/**
* Creates a new isolate with the passed {@linkplain CreateIsolateParameters parameters}. On
* success, the current thread is attached to the created isolate, and a pointer to its
* associated {@link IsolateThread} structure is returned.
*
* @param parameters Parameters for the creation of the isolate.
* @return A pointer to the structure that represents the current thread in the new isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread createIsolate(CreateIsolateParameters parameters) throws IsolateException {
Objects.requireNonNull(parameters);
return ImageSingletons.lookup(IsolateSupport.class).createIsolate(parameters);
}
/**
* Attaches the current thread to the passed isolate. If the thread has already been attached,
* the call provides the thread's existing isolate thread structure.
*
* @param isolate The isolate to which to attach the current thread.
* @return A pointer to the structure representing the newly attached isolate thread.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread attachCurrentThread(Isolate isolate) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).attachCurrentThread(isolate);
}
/**
* Given an isolate to which the current thread is attached, returns the address of the thread's
* associated isolate thread structure. If the current thread is not attached to the passed
* isolate, returns {@code null}.
*
* @param isolate The isolate for which to retrieve the current thread's corresponding structure
* @return A pointer to the current thread's structure in the specified isolate or {@code null}
* if the thread is not attached to that isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread getCurrentThread(Isolate isolate) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).getCurrentThread(isolate);
}
/**
* Given an isolate thread structure, determines to which isolate it belongs and returns the
* address of the isolate structure. May return {@code null} if the specified isolate thread
* structure is no longer valid.
*
* @param thread The isolate thread for which to retrieve the isolate.
* @return A pointer to the isolate, or {@code null}.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static Isolate getIsolate(IsolateThread thread) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).getIsolate(thread);
}
/**
* Detaches the passed isolate thread from its isolate and discards any state or context that is
* associated with it. At the time of the call, no code may still be executing in the isolate
* thread's context. The passed pointer is no longer valid after the method returns.
*
* @param thread The isolate thread to detach from its isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static void detachThread(IsolateThread thread) throws IsolateException {
ImageSingletons.lookup(IsolateSupport.class).detachThread(thread);
}
/**
* Tears down an isolate. Given an {@link IsolateThread} for the current thread which must be
* attached to the isolate to be torn down, waits for any other attached threads to detach from
* the isolate, then discards the isolate's objects, threads, and any other state or context
* that is associated with it. The passed pointer is no longer valid after the method returns.
*
* @param thread {@link IsolateThread} of the current thread that is attached to the isolate
* which is to be torn down.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static void tearDownIsolate(IsolateThread thread) throws IsolateException {
ImageSingletons.lookup(IsolateSupport.class).tearDownIsolate(thread);
}
}
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