/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2002 Jason Voegele <jason@jvoegele.com>
* Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
* Copyright (C) 2004-2005 Charles O Nutter <headius@headius.com>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.nio.channels.Channel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.WeakHashMap;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.jruby.common.IRubyWarnings.ID;
import org.jruby.exceptions.RaiseException;
import org.jruby.exceptions.ThreadKill;
import org.jruby.internal.runtime.FutureThread;
import org.jruby.internal.runtime.NativeThread;
import org.jruby.internal.runtime.RubyRunnable;
import org.jruby.internal.runtime.ThreadLike;
import org.jruby.internal.runtime.ThreadService;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.ExecutionContext;
import org.jruby.runtime.builtin.IRubyObject;
import java.util.concurrent.ExecutionException;
import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.ObjectMarshal;
import static org.jruby.runtime.Visibility.*;
import org.jruby.util.io.BlockingIO;
import org.jruby.util.io.SelectorFactory;
import static org.jruby.CompatVersion.*;
/**
* Implementation of Ruby's <code>Thread</code> class. Each Ruby thread is
* mapped to an underlying Java Virtual Machine thread.
* <p>
* Thread encapsulates the behavior of a thread of execution, including the main
* thread of the Ruby script. In the descriptions that follow, the parameter
* <code>aSymbol</code> refers to a symbol, which is either a quoted string or a
* <code>Symbol</code> (such as <code>:name</code>).
*
* Note: For CVS history, see ThreadClass.java.
*/
@JRubyClass(name="Thread")
public class RubyThread extends RubyObject implements ExecutionContext {
private ThreadLike threadImpl;
private RubyFixnum priority;
private transient Map<IRubyObject, IRubyObject> threadLocalVariables;
private final Map<Object, IRubyObject> contextVariables = new WeakHashMap<Object, IRubyObject>();
private boolean abortOnException;
private IRubyObject finalResult;
private RaiseException exitingException;
private RubyThreadGroup threadGroup;
private final ThreadService threadService;
// Error info is per-thread
private IRubyObject errorInfo;
// weak reference to associated ThreadContext
private volatile WeakReference<ThreadContext> contextRef;
private static final boolean DEBUG = false;
public static enum Status { RUN, SLEEP, ABORTING, DEAD }
private volatile ThreadService.Event mail;
private volatile Status status = Status.RUN;
private volatile BlockingTask currentBlockingTask;
protected RubyThread(Ruby runtime, RubyClass type) {
super(runtime, type);
this.threadService = runtime.getThreadService();
finalResult = runtime.getNil();
this.priority = RubyFixnum.newFixnum(runtime, Thread.NORM_PRIORITY);
// init errorInfo to nil
errorInfo = runtime.getNil();
}
public void receiveMail(ThreadService.Event event) {
synchronized (this) {
// if we're already aborting, we can receive no further mail
if (status == Status.ABORTING) return;
mail = event;
switch (event.type) {
case KILL:
status = Status.ABORTING;
}
// If this thread is sleeping or stopped, wake it
notify();
}
// interrupt the target thread in case it's blocking or waiting
// WARNING: We no longer interrupt the target thread, since this usually means
// interrupting IO and with NIO that means the channel is no longer usable.
// We either need a new way to handle waking a target thread that's waiting
// on IO, or we need to accept that we can't wake such threads and must wait
// for them to complete their operation.
//threadImpl.interrupt();
// new interrupt, to hopefully wake it out of any blocking IO
this.interrupt();
}
public synchronized void checkMail(ThreadContext context) {
ThreadService.Event myEvent = mail;
mail = null;
if (myEvent != null) {
switch (myEvent.type) {
case RAISE:
receivedAnException(context, myEvent.exception);
case KILL:
throwThreadKill();
}
}
}
public IRubyObject getErrorInfo() {
return errorInfo;
}
public IRubyObject setErrorInfo(IRubyObject errorInfo) {
this.errorInfo = errorInfo;
return errorInfo;
}
public void setContext(ThreadContext context) {
this.contextRef = new WeakReference<ThreadContext>(context);
}
public ThreadContext getContext() {
return contextRef.get();
}
public Thread getNativeThread() {
return threadImpl instanceof NativeThread ? ((NativeThread) threadImpl).getThread() : null;
}
/**
* Dispose of the current thread by removing it from its parent ThreadGroup.
*/
public void dispose() {
threadGroup.remove(this);
}
public static RubyClass createThreadClass(Ruby runtime) {
// FIXME: In order for Thread to play well with the standard 'new' behavior,
// it must provide an allocator that can create empty object instances which
// initialize then fills with appropriate data.
RubyClass threadClass = runtime.defineClass("Thread", runtime.getObject(), ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);
runtime.setThread(threadClass);
threadClass.index = ClassIndex.THREAD;
threadClass.setReifiedClass(RubyThread.class);
threadClass.defineAnnotatedMethods(RubyThread.class);
RubyThread rubyThread = new RubyThread(runtime, threadClass);
// TODO: need to isolate the "current" thread from class creation
rubyThread.threadImpl = new NativeThread(rubyThread, Thread.currentThread());
runtime.getThreadService().setMainThread(Thread.currentThread(), rubyThread);
// set to default thread group
runtime.getDefaultThreadGroup().addDirectly(rubyThread);
threadClass.setMarshal(ObjectMarshal.NOT_MARSHALABLE_MARSHAL);
return threadClass;
}
/**
* <code>Thread.new</code>
* <p>
* Thread.new( <i>[ arg ]*</i> ) {| args | block } -> aThread
* <p>
* Creates a new thread to execute the instructions given in block, and
* begins running it. Any arguments passed to Thread.new are passed into the
* block.
* <pre>
* x = Thread.new { sleep .1; print "x"; print "y"; print "z" }
* a = Thread.new { print "a"; print "b"; sleep .2; print "c" }
* x.join # Let the threads finish before
* a.join # main thread exits...
* </pre>
* <i>produces:</i> abxyzc
*/
@JRubyMethod(name = {"new", "fork"}, rest = true, meta = true)
public static IRubyObject newInstance(IRubyObject recv, IRubyObject[] args, Block block) {
return startThread(recv, args, true, block);
}
/**
* Basically the same as Thread.new . However, if class Thread is
* subclassed, then calling start in that subclass will not invoke the
* subclass's initialize method.
*/
@JRubyMethod(rest = true, meta = true)
public static RubyThread start(IRubyObject recv, IRubyObject[] args, Block block) {
return startThread(recv, args, false, block);
}
public static RubyThread adopt(IRubyObject recv, Thread t) {
return adoptThread(recv, t, Block.NULL_BLOCK);
}
private static RubyThread adoptThread(final IRubyObject recv, Thread t, Block block) {
final Ruby runtime = recv.getRuntime();
final RubyThread rubyThread = new RubyThread(runtime, (RubyClass) recv);
rubyThread.threadImpl = new NativeThread(rubyThread, t);
ThreadContext context = runtime.getThreadService().registerNewThread(rubyThread);
runtime.getThreadService().associateThread(t, rubyThread);
context.preAdoptThread();
// set to default thread group
runtime.getDefaultThreadGroup().addDirectly(rubyThread);
return rubyThread;
}
@JRubyMethod(rest = true, visibility = PRIVATE)
public IRubyObject initialize(ThreadContext context, IRubyObject[] args, Block block) {
Ruby runtime = getRuntime();
if (!block.isGiven()) throw runtime.newThreadError("must be called with a block");
try {
RubyRunnable runnable = new RubyRunnable(this, args, context.getFrames(0), block);
if (RubyInstanceConfig.POOLING_ENABLED) {
FutureThread futureThread = new FutureThread(this, runnable);
threadImpl = futureThread;
addToCorrectThreadGroup(context);
threadImpl.start();
// JRUBY-2380, associate future early so it shows up in Thread.list right away, in case it doesn't run immediately
runtime.getThreadService().associateThread(futureThread.getFuture(), this);
} else {
Thread thread = new Thread(runnable);
thread.setDaemon(true);
thread.setName("Ruby" + thread.getName() + ": " + context.getFile() + ":" + (context.getLine() + 1));
threadImpl = new NativeThread(this, thread);
addToCorrectThreadGroup(context);
threadImpl.start();
// JRUBY-2380, associate thread early so it shows up in Thread.list right away, in case it doesn't run immediately
runtime.getThreadService().associateThread(thread, this);
}
// We yield here to hopefully permit the target thread to schedule
// MRI immediately schedules it, so this is close but not exact
Thread.yield();
return this;
} catch (OutOfMemoryError oome) {
if (oome.getMessage().equals("unable to create new native thread")) {
throw runtime.newThreadError(oome.getMessage());
}
throw oome;
} catch (SecurityException ex) {
throw runtime.newThreadError(ex.getMessage());
}
}
private static RubyThread startThread(final IRubyObject recv, final IRubyObject[] args, boolean callInit, Block block) {
RubyThread rubyThread = new RubyThread(recv.getRuntime(), (RubyClass) recv);
if (callInit) {
rubyThread.callInit(args, block);
} else {
// for Thread::start, which does not call the subclass's initialize
rubyThread.initialize(recv.getRuntime().getCurrentContext(), args, block);
}
return rubyThread;
}
public synchronized void cleanTerminate(IRubyObject result) {
finalResult = result;
}
public synchronized void beDead() {
status = Status.DEAD;
}
public void pollThreadEvents() {
pollThreadEvents(getRuntime().getCurrentContext());
}
public void pollThreadEvents(ThreadContext context) {
if (mail != null) checkMail(context);
}
private static void throwThreadKill() {
throw new ThreadKill();
}
/**
* Returns the status of the global ``abort on exception'' condition. The
* default is false. When set to true, will cause all threads to abort (the
* process will exit(0)) if an exception is raised in any thread. See also
* Thread.abort_on_exception= .
*/
@JRubyMethod(name = "abort_on_exception", meta = true)
public static RubyBoolean abort_on_exception_x(IRubyObject recv) {
Ruby runtime = recv.getRuntime();
return runtime.isGlobalAbortOnExceptionEnabled() ? runtime.getTrue() : runtime.getFalse();
}
@JRubyMethod(name = "abort_on_exception=", required = 1, meta = true)
public static IRubyObject abort_on_exception_set_x(IRubyObject recv, IRubyObject value) {
recv.getRuntime().setGlobalAbortOnExceptionEnabled(value.isTrue());
return value;
}
@JRubyMethod(name = "current", meta = true)
public static RubyThread current(IRubyObject recv) {
return recv.getRuntime().getCurrentContext().getThread();
}
@JRubyMethod(name = "main", meta = true)
public static RubyThread main(IRubyObject recv) {
return recv.getRuntime().getThreadService().getMainThread();
}
@JRubyMethod(name = "pass", meta = true)
public static IRubyObject pass(IRubyObject recv) {
Ruby runtime = recv.getRuntime();
ThreadService ts = runtime.getThreadService();
boolean critical = ts.getCritical();
ts.setCritical(false);
Thread.yield();
ts.setCritical(critical);
return recv.getRuntime().getNil();
}
@JRubyMethod(name = "list", meta = true)
public static RubyArray list(IRubyObject recv) {
RubyThread[] activeThreads = recv.getRuntime().getThreadService().getActiveRubyThreads();
return recv.getRuntime().newArrayNoCopy(activeThreads);
}
private void addToCorrectThreadGroup(ThreadContext context) {
// JRUBY-3568, inherit threadgroup or use default
IRubyObject group = context.getThread().group();
if (!group.isNil()) {
((RubyThreadGroup) group).addDirectly(this);
} else {
context.getRuntime().getDefaultThreadGroup().addDirectly(this);
}
}
private IRubyObject getSymbolKey(IRubyObject originalKey) {
if (originalKey instanceof RubySymbol) {
return originalKey;
} else if (originalKey instanceof RubyString) {
return getRuntime().newSymbol(originalKey.asJavaString());
} else if (originalKey instanceof RubyFixnum) {
getRuntime().getWarnings().warn(ID.FIXNUMS_NOT_SYMBOLS, "Do not use Fixnums as Symbols");
throw getRuntime().newArgumentError(originalKey + " is not a symbol");
} else {
throw getRuntime().newTypeError(originalKey + " is not a symbol");
}
}
private synchronized Map<IRubyObject, IRubyObject> getThreadLocals() {
if (threadLocalVariables == null) {
threadLocalVariables = new HashMap<IRubyObject, IRubyObject>();
}
return threadLocalVariables;
}
public final Map<Object, IRubyObject> getContextVariables() {
return contextVariables;
}
public boolean isAlive(){
return threadImpl.isAlive() && status != Status.ABORTING;
}
@JRubyMethod(name = "[]", required = 1)
public IRubyObject op_aref(IRubyObject key) {
IRubyObject value;
if ((value = getThreadLocals().get(getSymbolKey(key))) != null) {
return value;
}
return getRuntime().getNil();
}
@JRubyMethod(name = "[]=", required = 2)
public IRubyObject op_aset(IRubyObject key, IRubyObject value) {
key = getSymbolKey(key);
getThreadLocals().put(key, value);
return value;
}
@JRubyMethod(name = "abort_on_exception")
public RubyBoolean abort_on_exception() {
return abortOnException ? getRuntime().getTrue() : getRuntime().getFalse();
}
@JRubyMethod(name = "abort_on_exception=", required = 1)
public IRubyObject abort_on_exception_set(IRubyObject val) {
abortOnException = val.isTrue();
return val;
}
@JRubyMethod(name = "alive?")
public RubyBoolean alive_p() {
return isAlive() ? getRuntime().getTrue() : getRuntime().getFalse();
}
@JRubyMethod(name = "join", optional = 1, backtrace = true)
public IRubyObject join(IRubyObject[] args) {
long timeoutMillis = Long.MAX_VALUE;
if (args.length > 0) {
if (args.length > 1) {
throw getRuntime().newArgumentError(args.length,1);
}
// MRI behavior: value given in seconds; converted to Float; less
// than or equal to zero returns immediately; returns nil
timeoutMillis = (long)(1000.0D * args[0].convertToFloat().getValue());
if (timeoutMillis <= 0) {
// TODO: not sure that we should skip calling join() altogether.
// Thread.join() has some implications for Java Memory Model, etc.
if (threadImpl.isAlive()) {
return getRuntime().getNil();
} else {
return this;
}
}
}
if (isCurrent()) {
throw getRuntime().newThreadError("thread " + identityString() + " tried to join itself");
}
try {
if (threadService.getCritical()) {
// If the target thread is sleeping or stopped, wake it
synchronized (this) {
notify();
}
// interrupt the target thread in case it's blocking or waiting
// WARNING: We no longer interrupt the target thread, since this usually means
// interrupting IO and with NIO that means the channel is no longer usable.
// We either need a new way to handle waking a target thread that's waiting
// on IO, or we need to accept that we can't wake such threads and must wait
// for them to complete their operation.
//threadImpl.interrupt();
}
RubyThread currentThread = getRuntime().getCurrentContext().getThread();
final long timeToWait = Math.min(timeoutMillis, 200);
// We need this loop in order to be able to "unblock" the
// join call without actually calling interrupt.
long start = System.currentTimeMillis();
while(true) {
currentThread.pollThreadEvents();
threadImpl.join(timeToWait);
if (!threadImpl.isAlive()) {
break;
}
if (System.currentTimeMillis() - start > timeoutMillis) {
break;
}
}
} catch (InterruptedException ie) {
ie.printStackTrace();
assert false : ie;
} catch (ExecutionException ie) {
ie.printStackTrace();
assert false : ie;
}
if (exitingException != null) {
throw exitingException;
}
if (threadImpl.isAlive()) {
return getRuntime().getNil();
} else {
return this;
}
}
@JRubyMethod
public IRubyObject value() {
join(new IRubyObject[0]);
synchronized (this) {
return finalResult;
}
}
@JRubyMethod
public IRubyObject group() {
if (threadGroup == null) {
return getRuntime().getNil();
}
return threadGroup;
}
void setThreadGroup(RubyThreadGroup rubyThreadGroup) {
threadGroup = rubyThreadGroup;
}
@JRubyMethod(name = "inspect")
@Override
public synchronized IRubyObject inspect() {
// FIXME: There's some code duplication here with RubyObject#inspect
StringBuilder part = new StringBuilder();
String cname = getMetaClass().getRealClass().getName();
part.append("#<").append(cname).append(":");
part.append(identityString());
part.append(' ');
part.append(status.toString().toLowerCase());
part.append('>');
return getRuntime().newString(part.toString());
}
@JRubyMethod(name = "key?", required = 1)
public RubyBoolean key_p(IRubyObject key) {
key = getSymbolKey(key);
return getRuntime().newBoolean(getThreadLocals().containsKey(key));
}
@JRubyMethod(name = "keys")
public RubyArray keys() {
IRubyObject[] keys = new IRubyObject[getThreadLocals().size()];
return RubyArray.newArrayNoCopy(getRuntime(), getThreadLocals().keySet().toArray(keys));
}
@JRubyMethod(name = "critical=", required = 1, meta = true, compat = CompatVersion.RUBY1_8)
public static IRubyObject critical_set(IRubyObject receiver, IRubyObject value) {
receiver.getRuntime().getThreadService().setCritical(value.isTrue());
return value;
}
@JRubyMethod(name = "critical", meta = true, compat = CompatVersion.RUBY1_8)
public static IRubyObject critical(IRubyObject receiver) {
return receiver.getRuntime().newBoolean(receiver.getRuntime().getThreadService().getCritical());
}
@JRubyMethod(name = "stop", meta = true)
public static IRubyObject stop(ThreadContext context, IRubyObject receiver) {
RubyThread rubyThread = context.getThread();
synchronized (rubyThread) {
rubyThread.checkMail(context);
try {
// attempt to decriticalize all if we're the critical thread
receiver.getRuntime().getThreadService().setCritical(false);
rubyThread.status = Status.SLEEP;
rubyThread.wait();
} catch (InterruptedException ie) {
rubyThread.checkMail(context);
rubyThread.status = Status.RUN;
}
}
return receiver.getRuntime().getNil();
}
@JRubyMethod(required = 1, meta = true)
public static IRubyObject kill(IRubyObject receiver, IRubyObject rubyThread, Block block) {
if (!(rubyThread instanceof RubyThread)) throw receiver.getRuntime().newTypeError(rubyThread, receiver.getRuntime().getThread());
return ((RubyThread)rubyThread).kill();
}
@JRubyMethod(meta = true)
public static IRubyObject s_exit(IRubyObject receiver, Block block) {
RubyThread rubyThread = receiver.getRuntime().getThreadService().getCurrentContext().getThread();
synchronized (rubyThread) {
rubyThread.status = Status.ABORTING;
rubyThread.mail = null;
receiver.getRuntime().getThreadService().setCritical(false);
throw new ThreadKill();
}
}
@JRubyMethod(name = "stop?")
public RubyBoolean stop_p() {
// not valid for "dead" state
return getRuntime().newBoolean(status == Status.SLEEP || status == Status.DEAD);
}
@JRubyMethod(name = "wakeup")
public synchronized RubyThread wakeup() {
if(!threadImpl.isAlive() && status == Status.DEAD) {
throw getRuntime().newThreadError("killed thread");
}
status = Status.RUN;
notifyAll();
return this;
}
@JRubyMethod(name = "priority")
public RubyFixnum priority() {
return priority;
}
@JRubyMethod(name = "priority=", required = 1)
public IRubyObject priority_set(IRubyObject priority) {
// FIXME: This should probably do some translation from Ruby priority levels to Java priority levels (until we have green threads)
int iPriority = RubyNumeric.fix2int(priority);
if (iPriority < Thread.MIN_PRIORITY) {
iPriority = Thread.MIN_PRIORITY;
} else if (iPriority > Thread.MAX_PRIORITY) {
iPriority = Thread.MAX_PRIORITY;
}
this.priority = RubyFixnum.newFixnum(getRuntime(), iPriority);
if (threadImpl.isAlive()) {
threadImpl.setPriority(iPriority);
}
return this.priority;
}
@JRubyMethod(optional = 3)
public IRubyObject raise(IRubyObject[] args, Block block) {
Ruby runtime = getRuntime();
ThreadContext context = runtime.getCurrentContext();
if (this == context.getThread()) {
return RubyKernel.raise(context, runtime.getKernel(), args, block);
}
if (DEBUG) System.out.println("thread " + Thread.currentThread() + " before raising");
RubyThread currentThread = getRuntime().getCurrentContext().getThread();
if (DEBUG) System.out.println("thread " + Thread.currentThread() + " raising");
IRubyObject exception = prepareRaiseException(runtime, args, block);
runtime.getThreadService().deliverEvent(new ThreadService.Event(currentThread, this, ThreadService.Event.Type.RAISE, exception));
return this;
}
/**
* This is intended to be used to raise exceptions in Ruby threads from non-
* Ruby threads like Timeout's thread.
*
* @param args Same args as for Thread#raise
* @param block Same as for Thread#raise
*/
public void internalRaise(IRubyObject[] args) {
Ruby runtime = getRuntime();
IRubyObject exception = prepareRaiseException(runtime, args, Block.NULL_BLOCK);
receiveMail(new ThreadService.Event(this, this, ThreadService.Event.Type.RAISE, exception));
}
private IRubyObject prepareRaiseException(Ruby runtime, IRubyObject[] args, Block block) {
if(args.length == 0) {
IRubyObject lastException = errorInfo;
if(lastException.isNil()) {
return new RaiseException(runtime, runtime.getRuntimeError(), "", false).getException();
}
return lastException;
}
IRubyObject exception;
ThreadContext context = getRuntime().getCurrentContext();
if(args.length == 1) {
if(args[0] instanceof RubyString) {
return runtime.getRuntimeError().newInstance(context, args, block);
}
if(!args[0].respondsTo("exception")) {
return runtime.newTypeError("exception class/object expected").getException();
}
exception = args[0].callMethod(context, "exception");
} else {
if (!args[0].respondsTo("exception")) {
return runtime.newTypeError("exception class/object expected").getException();
}
exception = args[0].callMethod(context, "exception", args[1]);
}
if (!runtime.getException().isInstance(exception)) {
return runtime.newTypeError("exception object expected").getException();
}
if (args.length == 3) {
((RubyException) exception).set_backtrace(args[2]);
}
return exception;
}
@JRubyMethod(name = "run")
public synchronized IRubyObject run() {
return wakeup();
}
/**
* We can never be sure if a wait will finish because of a Java "spurious wakeup". So if we
* explicitly wakeup and we wait less than requested amount we will return false. We will
* return true if we sleep right amount or less than right amount via spurious wakeup.
*/
public synchronized boolean sleep(long millis) throws InterruptedException {
assert this == getRuntime().getCurrentContext().getThread();
boolean result = true;
synchronized (this) {
pollThreadEvents();
try {
status = Status.SLEEP;
if (millis == -1) {
wait();
} else {
wait(millis);
}
} finally {
result = (status != Status.RUN);
pollThreadEvents();
status = Status.RUN;
}
}
return result;
}
@JRubyMethod(name = "status")
public synchronized IRubyObject status() {
if (threadImpl.isAlive()) {
// TODO: no java stringity
return getRuntime().newString(status.toString().toLowerCase());
} else if (exitingException != null) {
return getRuntime().getNil();
} else {
return getRuntime().getFalse();
}
}
public static interface BlockingTask {
public void run() throws InterruptedException;
public void wakeup();
}
public static final class SleepTask implements BlockingTask {
private final Object object;
private final long millis;
private final int nanos;
public SleepTask(Object object, long millis, int nanos) {
this.object = object;
this.millis = millis;
this.nanos = nanos;
}
public void run() throws InterruptedException {
synchronized (object) {
object.wait(millis, nanos);
}
}
public void wakeup() {
synchronized (object) {
object.notify();
}
}
}
public void executeBlockingTask(BlockingTask task) throws InterruptedException {
enterSleep();
try {
currentBlockingTask = task;
pollThreadEvents();
task.run();
} finally {
exitSleep();
currentBlockingTask = null;
pollThreadEvents();
}
}
public void enterSleep() {
status = Status.SLEEP;
}
public void exitSleep() {
status = Status.RUN;
}
@JRubyMethod(name = {"kill", "exit", "terminate"})
public IRubyObject kill() {
// need to reexamine this
RubyThread currentThread = getRuntime().getCurrentContext().getThread();
// If the killee thread is the same as the killer thread, just die
if (currentThread == this) throwThreadKill();
if (DEBUG) System.out.println("thread " + Thread.currentThread() + " trying to kill");
currentThread.pollThreadEvents();
getRuntime().getThreadService().deliverEvent(new ThreadService.Event(currentThread, this, ThreadService.Event.Type.KILL));
if (DEBUG) System.out.println("thread " + Thread.currentThread() + " succeeded with kill");
return this;
}
@JRubyMethod(name = {"kill!", "exit!", "terminate!"}, compat = RUBY1_8)
public IRubyObject kill_bang() {
throw getRuntime().newNotImplementedError("Thread#kill!, exit!, and terminate! are not safe and not supported");
}
@JRubyMethod(name = "safe_level")
public IRubyObject safe_level() {
throw getRuntime().newNotImplementedError("Thread-specific SAFE levels are not supported");
}
@JRubyMethod(compat = CompatVersion.RUBY1_9)
public IRubyObject backtrace(ThreadContext context) {
return getContext().createCallerBacktrace(context.getRuntime(), 0);
}
public StackTraceElement[] javaBacktrace() {
if (threadImpl instanceof NativeThread) {
return ((NativeThread)threadImpl).getThread().getStackTrace();
}
// Future-based threads can't get a Java trace
return new StackTraceElement[0];
}
private boolean isCurrent() {
return threadImpl.isCurrent();
}
public void exceptionRaised(RaiseException exception) {
assert isCurrent();
RubyException rubyException = exception.getException();
Ruby runtime = rubyException.getRuntime();
if (runtime.getSystemExit().isInstance(rubyException)) {
threadService.getMainThread().raise(new IRubyObject[] {rubyException}, Block.NULL_BLOCK);
} else if (abortOnException(runtime)) {
runtime.printError(rubyException);
RubyException systemExit = RubySystemExit.newInstance(runtime, 1);
systemExit.message = rubyException.message;
systemExit.set_backtrace(rubyException.backtrace());
threadService.getMainThread().raise(new IRubyObject[] {systemExit}, Block.NULL_BLOCK);
return;
} else if (runtime.getDebug().isTrue()) {
runtime.printError(exception.getException());
}
exitingException = exception;
}
private boolean abortOnException(Ruby runtime) {
return (runtime.isGlobalAbortOnExceptionEnabled() || abortOnException);
}
public static RubyThread mainThread(IRubyObject receiver) {
return receiver.getRuntime().getThreadService().getMainThread();
}
private volatile Selector currentSelector;
@Deprecated
public boolean selectForAccept(RubyIO io) {
return select(io, SelectionKey.OP_ACCEPT);
}
private synchronized Selector getSelector(SelectableChannel channel) throws IOException {
return SelectorFactory.openWithRetryFrom(getRuntime(), channel.provider());
}
public boolean select(RubyIO io, int ops) {
return select(io.getChannel(), io, ops);
}
public boolean select(RubyIO io, int ops, long timeout) {
return select(io.getChannel(), io, ops, timeout);
}
public boolean select(Channel channel, RubyIO io, int ops) {
return select(channel, io, ops, -1);
}
public boolean select(Channel channel, RubyIO io, int ops, long timeout) {
if (channel instanceof SelectableChannel) {
SelectableChannel selectable = (SelectableChannel)channel;
synchronized (selectable.blockingLock()) {
boolean oldBlocking = selectable.isBlocking();
SelectionKey key = null;
try {
selectable.configureBlocking(false);
if (io != null) io.addBlockingThread(this);
currentSelector = getRuntime().getSelectorPool().get();
key = selectable.register(currentSelector, ops);
beforeBlockingCall();
int result;
if (timeout < 0) {
result = currentSelector.select();
} else if (timeout == 0) {
result = currentSelector.selectNow();
} else {
result = currentSelector.select(timeout);
}
// check for thread events, in case we've been woken up to die
pollThreadEvents();
if (result == 1) {
Set<SelectionKey> keySet = currentSelector.selectedKeys();
if (keySet.iterator().next() == key) {
return true;
}
}
return false;
} catch (IOException ioe) {
throw getRuntime().newRuntimeError("Error with selector: " + ioe);
} finally {
// Note: I don't like ignoring these exceptions, but it's
// unclear how likely they are to happen or what damage we
// might do by ignoring them. Note that the pieces are separate
// so that we can ensure one failing does not affect the others
// running.
// clean up the key in the selector
try {
if (key != null) key.cancel();
if (currentSelector != null) currentSelector.selectNow();
} catch (Exception e) {
// ignore
}
// shut down and null out the selector
try {
if (currentSelector != null) {
getRuntime().getSelectorPool().put(currentSelector);
}
} catch (Exception e) {
// ignore
} finally {
currentSelector = null;
}
// remove this thread as a blocker against the given IO
if (io != null) io.removeBlockingThread(this);
// go back to previous blocking state on the selectable
try {
selectable.configureBlocking(oldBlocking);
} catch (Exception e) {
// ignore
}
// clear thread state from blocking call
afterBlockingCall();
}
}
} else {
// can't select, just have to do a blocking call
return true;
}
}
public void interrupt() {
Selector activeSelector = currentSelector;
if (activeSelector != null) {
activeSelector.wakeup();
}
BlockingIO.Condition iowait = blockingIO;
if (iowait != null) {
iowait.cancel();
}
BlockingTask task = currentBlockingTask;
if (task != null) {
task.wakeup();
}
}
private volatile BlockingIO.Condition blockingIO = null;
public boolean waitForIO(ThreadContext context, RubyIO io, int ops) {
Channel channel = io.getChannel();
if (!(channel instanceof SelectableChannel)) {
return true;
}
try {
io.addBlockingThread(this);
blockingIO = BlockingIO.newCondition(channel, ops);
boolean ready = blockingIO.await();
// check for thread events, in case we've been woken up to die
pollThreadEvents();
return ready;
} catch (IOException ioe) {
throw context.getRuntime().newRuntimeError("Error with selector: " + ioe);
} catch (InterruptedException ex) {
// FIXME: not correct exception
throw context.getRuntime().newRuntimeError("Interrupted");
} finally {
blockingIO = null;
io.removeBlockingThread(this);
}
}
public void beforeBlockingCall() {
pollThreadEvents();
enterSleep();
}
public void afterBlockingCall() {
exitSleep();
pollThreadEvents();
}
private void receivedAnException(ThreadContext context, IRubyObject exception) {
RubyModule kernelModule = getRuntime().getKernel();
if (DEBUG) {
System.out.println("thread " + Thread.currentThread() + " before propagating exception: " + status);
}
kernelModule.callMethod(context, "raise", exception);
}
public boolean wait_timeout(IRubyObject o, Double timeout) throws InterruptedException {
if ( timeout != null ) {
long delay_ns = (long)(timeout.doubleValue() * 1000000000.0);
long start_ns = System.nanoTime();
if (delay_ns > 0) {
long delay_ms = delay_ns / 1000000;
int delay_ns_remainder = (int)( delay_ns % 1000000 );
executeBlockingTask(new SleepTask(o, delay_ms, delay_ns_remainder));
}
long end_ns = System.nanoTime();
return ( end_ns - start_ns ) <= delay_ns;
} else {
executeBlockingTask(new SleepTask(o, 0, 0));
return true;
}
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final RubyThread other = (RubyThread)obj;
if (this.threadImpl != other.threadImpl && (this.threadImpl == null || !this.threadImpl.equals(other.threadImpl))) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 3;
hash = 97 * hash + (this.threadImpl != null ? this.threadImpl.hashCode() : 0);
return hash;
}
public String toString() {
return threadImpl.toString();
}
private String identityString() {
return "0x" + Integer.toHexString(System.identityHashCode(this));
}
}