/*
* 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),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* 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,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.oracle.truffle.js.test.threading;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.Value;
import org.junit.Test;
public class ConcurrentAccess {
Concurrent execution of code belonging to two distinct JS contexts is allowed.
/**
* Concurrent execution of code belonging to two distinct JS contexts is allowed.
*/
@Test
public void concurrentEvalsTwoContexts() throws InterruptedException {
final String jsonCode = "(function(x,y) { return JSON.stringify({x:x,y:y}); })";
try (Context cx1 = TestUtil.newContextBuilder().build(); Context cx2 = TestUtil.newContextBuilder().build()) {
Value json1 = cx1.eval("js", jsonCode);
Value json2 = cx2.eval("js", jsonCode);
Thread thread = new Thread(() -> {
for (int i = 0; i < 1000; i++) {
String encoded = json1.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
}
});
thread.start();
for (int i = 0; i < 1000; i++) {
String encoded = json2.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
}
thread.join();
}
}
Host threads cannot be executed using Graal.js' Java interop.
/**
* Host threads cannot be executed using Graal.js' Java interop.
*/
@Test(timeout = 30000)
public void javaInteropThread() throws InterruptedException {
final CountDownLatch endGate = new CountDownLatch(1);
final AtomicReference<Throwable> exception = new AtomicReference<>(null);
final Context context = TestUtil.newContextBuilder().allowHostAccess(HostAccess.ALL).allowHostClassLookup(s -> true).build();
context.getBindings("js").putMember("onThreadException", (Thread.UncaughtExceptionHandler) (t, e) -> {
exception.set(e);
endGate.countDown();
});
final String threadCode = "var Thread = Java.type('java.lang.Thread');" +
"var t = new Thread(function() {" +
" console.log('hello from another thread');" +
"});" +
"t.setUncaughtExceptionHandler(onThreadException);" +
"t.start();" +
"t.join();";
try {
context.eval("js", threadCode);
endGate.await();
Throwable throwable = exception.get();
assertNotNull(throwable);
assertTrue(throwable instanceof IllegalStateException);
} finally {
context.close();
}
}
Concurrent execution of code belonging to the same context is prevented without
entering/leaving the Graal.js context.
/**
* Concurrent execution of code belonging to the same context is prevented without
* entering/leaving the Graal.js context.
*/
@Test(timeout = 30000)
public void concurrentEvalsNoEnter() {
final CountDownLatch startGate = new CountDownLatch(1);
final CountDownLatch endGate = new CountDownLatch(1);
final AtomicBoolean hadException = new AtomicBoolean(false);
final Context cx = TestUtil.newContextBuilder().build();
Value json = cx.eval("js", "(function(x,y) { return JSON.stringify({x:x,y:y}); })");
Thread t = new Thread(() -> {
try {
startGate.await();
try {
while (!hadException.get()) {
try {
String encoded = json.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
} catch (IllegalStateException e) {
hadException.set(true);
}
}
} finally {
endGate.countDown();
}
} catch (InterruptedException ignored) {
}
});
try {
t.start();
startGate.countDown();
while (!hadException.get()) {
try {
String encoded = json.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
} catch (IllegalStateException e) {
hadException.set(true);
}
}
endGate.await();
t.join(10000);
} catch (InterruptedException e) {
throw new AssertionError(e);
} finally {
cx.close();
}
}
Concurrent execution of code belonging to the same context is enabled when proper
synchronization is used and the shared JS context is accessed using enter/leave.
/**
* Concurrent execution of code belonging to the same context is enabled when proper
* synchronization is used and the shared JS context is accessed using enter/leave.
*/
@Test(timeout = 30000)
public void concurrentEvalsWithEnter() {
final CountDownLatch startGate = new CountDownLatch(1);
final CountDownLatch endGate = new CountDownLatch(1);
final AtomicBoolean hadException = new AtomicBoolean(false);
final Context cx = TestUtil.newContextBuilder().build();
final ReentrantLock contextLock = new ReentrantLock();
cx.enter();
Value json = cx.eval("js", "(function(x,y) { return JSON.stringify({x:x,y:y}); })");
cx.leave();
Thread t = new Thread(() -> {
try {
startGate.await();
try {
for (int it = 0; it < 100000; it++) {
try {
try {
contextLock.lock();
cx.enter();
String encoded = json.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
} finally {
cx.leave();
contextLock.unlock();
}
} catch (IllegalStateException e) {
hadException.set(true);
}
}
} finally {
endGate.countDown();
}
} catch (InterruptedException ignored) {
}
});
try {
t.start();
startGate.countDown();
for (int it = 0; it < 100000; it++) {
try {
contextLock.lock();
cx.enter();
String encoded = json.execute(42, 43).asString();
assertEquals("{\"x\":42,\"y\":43}", encoded);
cx.leave();
} finally {
contextLock.unlock();
}
}
endGate.await();
t.join(10000);
} catch (InterruptedException e) {
throw new AssertionError(e);
} finally {
cx.close();
}
assertFalse(hadException.get());
}
}