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8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning
Co-authored-by: Patricio Chilano Mateo <pchilanomate@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Fei Yang <fyang@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Richard Reingruber <rrich@openjdk.org> Co-authored-by: Martin Doerr <mdoerr@openjdk.org> Reviewed-by: aboldtch, dholmes, coleenp, fbredberg, dlong, sspitsyn
This commit is contained in:
Patricio Chilano Mateo
parent
8a2a75e56d
commit
78b80150e0
246 changed files with 8295 additions and 2755 deletions
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@ -41,7 +41,6 @@ import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.ScheduledThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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import jdk.internal.event.VirtualThreadEndEvent;
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import jdk.internal.event.VirtualThreadPinnedEvent;
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import jdk.internal.event.VirtualThreadStartEvent;
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import jdk.internal.event.VirtualThreadSubmitFailedEvent;
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import jdk.internal.misc.CarrierThread;
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@ -70,12 +69,12 @@ final class VirtualThread extends BaseVirtualThread {
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private static final ContinuationScope VTHREAD_SCOPE = new ContinuationScope("VirtualThreads");
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private static final ForkJoinPool DEFAULT_SCHEDULER = createDefaultScheduler();
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private static final ScheduledExecutorService[] DELAYED_TASK_SCHEDULERS = createDelayedTaskSchedulers();
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private static final int TRACE_PINNING_MODE = tracePinningMode();
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private static final long STATE = U.objectFieldOffset(VirtualThread.class, "state");
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private static final long PARK_PERMIT = U.objectFieldOffset(VirtualThread.class, "parkPermit");
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private static final long CARRIER_THREAD = U.objectFieldOffset(VirtualThread.class, "carrierThread");
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private static final long TERMINATION = U.objectFieldOffset(VirtualThread.class, "termination");
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private static final long ON_WAITING_LIST = U.objectFieldOffset(VirtualThread.class, "onWaitingList");
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// scheduler and continuation
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private final Executor scheduler;
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@ -106,6 +105,21 @@ final class VirtualThread extends BaseVirtualThread {
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* TIMED_PARKED -> UNPARKED // unparked, may be scheduled to continue
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* TIMED_PINNED -> RUNNING // unparked, continue execution on same carrier
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*
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* RUNNING -> BLOCKING // blocking on monitor enter
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* BLOCKING -> BLOCKED // blocked on monitor enter
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* BLOCKED -> UNBLOCKED // unblocked, may be scheduled to continue
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* UNBLOCKED -> RUNNING // continue execution after blocked on monitor enter
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*
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* RUNNING -> WAITING // transitional state during wait on monitor
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* WAITING -> WAITED // waiting on monitor
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* WAITED -> BLOCKED // notified, waiting to be unblocked by monitor owner
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* WAITED -> UNBLOCKED // timed-out/interrupted
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*
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* RUNNING -> TIMED_WAITING // transition state during timed-waiting on monitor
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* TIMED_WAITING -> TIMED_WAITED // timed-waiting on monitor
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* TIMED_WAITED -> BLOCKED // notified, waiting to be unblocked by monitor owner
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* TIMED_WAITED -> UNBLOCKED // timed-out/interrupted
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*
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* RUNNING -> YIELDING // Thread.yield
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* YIELDING -> YIELDED // cont.yield successful, may be scheduled to continue
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* YIELDING -> RUNNING // cont.yield failed
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@ -128,18 +142,44 @@ final class VirtualThread extends BaseVirtualThread {
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private static final int YIELDING = 10;
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private static final int YIELDED = 11; // unmounted but runnable
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// monitor enter
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private static final int BLOCKING = 12;
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private static final int BLOCKED = 13; // unmounted
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private static final int UNBLOCKED = 14; // unmounted but runnable
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// monitor wait/timed-wait
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private static final int WAITING = 15;
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private static final int WAIT = 16; // waiting in Object.wait
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private static final int TIMED_WAITING = 17;
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private static final int TIMED_WAIT = 18; // waiting in timed-Object.wait
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private static final int TERMINATED = 99; // final state
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// can be suspended from scheduling when unmounted
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private static final int SUSPENDED = 1 << 8;
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// parking permit
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// parking permit made available by LockSupport.unpark
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private volatile boolean parkPermit;
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// timeout for timed-park, in nanoseconds, only accessed on current/carrier thread
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private long parkTimeout;
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// blocking permit made available by unblocker thread when another thread exits monitor
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private volatile boolean blockPermit;
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// timer task for timed-park, only accessed on current/carrier thread
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// true when on the list of virtual threads waiting to be unblocked
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private volatile boolean onWaitingList;
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// next virtual thread on the list of virtual threads waiting to be unblocked
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private volatile VirtualThread next;
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// notified by Object.notify/notifyAll while waiting in Object.wait
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private volatile boolean notified;
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// timed-wait support
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private byte timedWaitSeqNo;
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// timeout for timed-park and timed-wait, only accessed on current/carrier thread
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private long timeout;
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// timer task for timed-park and timed-wait, only accessed on current/carrier thread
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private Future<?> timeoutTask;
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// carrier thread when mounted, accessed by VM
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@ -202,18 +242,6 @@ final class VirtualThread extends BaseVirtualThread {
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}
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@Override
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protected void onPinned(Continuation.Pinned reason) {
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if (TRACE_PINNING_MODE > 0) {
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boolean printAll = (TRACE_PINNING_MODE == 1);
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VirtualThread vthread = (VirtualThread) Thread.currentThread();
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int oldState = vthread.state();
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try {
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// avoid printing when in transition states
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vthread.setState(RUNNING);
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PinnedThreadPrinter.printStackTrace(System.out, reason, printAll);
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} finally {
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vthread.setState(oldState);
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}
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}
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}
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private static Runnable wrap(VirtualThread vthread, Runnable task) {
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return new Runnable() {
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@ -245,16 +273,20 @@ final class VirtualThread extends BaseVirtualThread {
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// set state to RUNNING
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int initialState = state();
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if (initialState == STARTED || initialState == UNPARKED || initialState == YIELDED) {
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if (initialState == STARTED || initialState == UNPARKED
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|| initialState == UNBLOCKED || initialState == YIELDED) {
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// newly started or continue after parking/blocking/Thread.yield
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if (!compareAndSetState(initialState, RUNNING)) {
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return;
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}
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// consume permit when continuing after parking. If continuing after a
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// timed-park then the timeout task is cancelled.
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// consume permit when continuing after parking or blocking. If continue
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// after a timed-park or timed-wait then the timeout task is cancelled.
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if (initialState == UNPARKED) {
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cancelTimeoutTask();
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setParkPermit(false);
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} else if (initialState == UNBLOCKED) {
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cancelTimeoutTask();
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blockPermit = false;
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}
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} else {
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// not runnable
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@ -275,8 +307,8 @@ final class VirtualThread extends BaseVirtualThread {
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}
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/**
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* Cancel timeout task when continuing after a timed-park. The
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* timeout task may be executing, or may have already completed.
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* Cancel timeout task when continuing after timed-park or timed-wait.
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* The timeout task may be executing, or may have already completed.
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*/
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private void cancelTimeoutTask() {
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if (timeoutTask != null) {
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@ -511,7 +543,7 @@ final class VirtualThread extends BaseVirtualThread {
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/**
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* Invoked in the context of the carrier thread after the Continuation yields when
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* parking or Thread.yield.
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* parking, blocking on monitor enter, Object.wait, or Thread.yield.
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*/
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private void afterYield() {
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assert carrierThread == null;
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@ -530,8 +562,8 @@ final class VirtualThread extends BaseVirtualThread {
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setState(newState = PARKED);
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} else {
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// schedule unpark
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assert parkTimeout > 0;
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timeoutTask = schedule(this::unpark, parkTimeout, NANOSECONDS);
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assert timeout > 0;
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timeoutTask = schedule(this::unpark, timeout, NANOSECONDS);
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setState(newState = TIMED_PARKED);
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}
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@ -556,6 +588,56 @@ final class VirtualThread extends BaseVirtualThread {
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return;
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}
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// blocking on monitorenter
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if (s == BLOCKING) {
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setState(BLOCKED);
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// may have been unblocked while blocking
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if (blockPermit && compareAndSetState(BLOCKED, UNBLOCKED)) {
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// lazy submit if local queue is empty
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lazySubmitRunContinuation();
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}
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return;
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}
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// Object.wait
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if (s == WAITING || s == TIMED_WAITING) {
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int newState;
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if (s == WAITING) {
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setState(newState = WAIT);
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} else {
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// For timed-wait, a timeout task is scheduled to execute. The timeout
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// task will change the thread state to UNBLOCKED and submit the thread
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// to the scheduler. A sequence number is used to ensure that the timeout
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// task only unblocks the thread for this timed-wait. We synchronize with
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// the timeout task to coordinate access to the sequence number and to
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// ensure the timeout task doesn't execute until the thread has got to
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// the TIMED_WAIT state.
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assert timeout > 0;
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synchronized (timedWaitLock()) {
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byte seqNo = ++timedWaitSeqNo;
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timeoutTask = schedule(() -> waitTimeoutExpired(seqNo), timeout, MILLISECONDS);
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setState(newState = TIMED_WAIT);
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}
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}
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// may have been notified while in transition to wait state
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if (notified && compareAndSetState(newState, BLOCKED)) {
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// may have even been unblocked already
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if (blockPermit && compareAndSetState(BLOCKED, UNBLOCKED)) {
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submitRunContinuation();
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}
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return;
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}
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// may have been interrupted while in transition to wait state
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if (interrupted && compareAndSetState(newState, UNBLOCKED)) {
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submitRunContinuation();
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return;
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}
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return;
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}
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assert false;
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}
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@ -695,7 +777,7 @@ final class VirtualThread extends BaseVirtualThread {
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// park the thread, afterYield will schedule the thread to unpark
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boolean yielded = false;
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setParkTimeout(nanos);
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timeout = nanos;
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setState(TIMED_PARKING);
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try {
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yielded = yieldContinuation();
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@ -727,14 +809,6 @@ final class VirtualThread extends BaseVirtualThread {
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private void parkOnCarrierThread(boolean timed, long nanos) {
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assert state() == RUNNING;
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VirtualThreadPinnedEvent event;
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try {
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event = new VirtualThreadPinnedEvent();
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event.begin();
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} catch (OutOfMemoryError e) {
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event = null;
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}
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setState(timed ? TIMED_PINNED : PINNED);
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try {
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if (!parkPermit) {
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@ -751,15 +825,18 @@ final class VirtualThread extends BaseVirtualThread {
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// consume parking permit
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setParkPermit(false);
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if (event != null) {
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try {
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event.commit();
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} catch (OutOfMemoryError e) {
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// ignore
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}
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}
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// JFR jdk.VirtualThreadPinned event
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postPinnedEvent("LockSupport.park");
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}
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/**
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* Call into VM when pinned to record a JFR jdk.VirtualThreadPinned event.
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* Recording the event in the VM avoids having JFR event recorded in Java
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* with the same name, but different ID, to events recorded by the VM.
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*/
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@Hidden
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private static native void postPinnedEvent(String op);
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/**
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* Re-enables this virtual thread for scheduling. If this virtual thread is parked
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* then its task is scheduled to continue, otherwise its next call to {@code park} or
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@ -796,6 +873,49 @@ final class VirtualThread extends BaseVirtualThread {
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}
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}
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/**
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* Invoked by unblocker thread to unblock this virtual thread.
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*/
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private void unblock() {
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assert !Thread.currentThread().isVirtual();
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blockPermit = true;
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if (state() == BLOCKED && compareAndSetState(BLOCKED, UNBLOCKED)) {
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submitRunContinuation();
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}
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}
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/**
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* Invoked by timer thread when wait timeout for virtual thread has expired.
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* If the virtual thread is in timed-wait then this method will unblock the thread
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* and submit its task so that it continues and attempts to reenter the monitor.
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* This method does nothing if the thread has been woken by notify or interrupt.
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*/
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private void waitTimeoutExpired(byte seqNo) {
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assert !Thread.currentThread().isVirtual();
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for (;;) {
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boolean unblocked = false;
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synchronized (timedWaitLock()) {
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if (seqNo != timedWaitSeqNo) {
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// this timeout task is for a past timed-wait
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return;
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}
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int s = state();
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if (s == TIMED_WAIT) {
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unblocked = compareAndSetState(TIMED_WAIT, UNBLOCKED);
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} else if (s != (TIMED_WAIT | SUSPENDED)) {
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// notified or interrupted, no longer waiting
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return;
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}
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}
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if (unblocked) {
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submitRunContinuation();
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return;
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}
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// need to retry when thread is suspended in time-wait
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Thread.yield();
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}
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}
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/**
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* Attempts to yield the current virtual thread (Thread.yield).
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*/
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@ -926,6 +1046,12 @@ final class VirtualThread extends BaseVirtualThread {
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// make available parking permit, unpark thread if parked
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unpark();
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// if thread is waiting in Object.wait then schedule to try to reenter
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int s = state();
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if ((s == WAIT || s == TIMED_WAIT) && compareAndSetState(s, UNBLOCKED)) {
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submitRunContinuation();
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}
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} else {
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interrupted = true;
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carrierThread.setInterrupt();
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@ -970,6 +1096,7 @@ final class VirtualThread extends BaseVirtualThread {
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return Thread.State.RUNNABLE;
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}
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case UNPARKED:
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case UNBLOCKED:
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case YIELDED:
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// runnable, not mounted
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return Thread.State.RUNNABLE;
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@ -992,15 +1119,22 @@ final class VirtualThread extends BaseVirtualThread {
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return Thread.State.RUNNABLE;
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case PARKING:
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case TIMED_PARKING:
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case WAITING:
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case TIMED_WAITING:
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case YIELDING:
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// runnable, in transition
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return Thread.State.RUNNABLE;
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case PARKED:
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case PINNED:
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case WAIT:
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return Thread.State.WAITING;
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case TIMED_PARKED:
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case TIMED_PINNED:
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case TIMED_WAIT:
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return Thread.State.TIMED_WAITING;
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case BLOCKING:
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case BLOCKED:
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return Thread.State.BLOCKED;
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case TERMINATED:
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return Thread.State.TERMINATED;
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default:
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@ -1046,13 +1180,13 @@ final class VirtualThread extends BaseVirtualThread {
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case RUNNING, PINNED, TIMED_PINNED -> {
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return null; // mounted
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}
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case PARKED, TIMED_PARKED -> {
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case PARKED, TIMED_PARKED, BLOCKED, WAIT, TIMED_WAIT -> {
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// unmounted, not runnable
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}
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case UNPARKED, YIELDED -> {
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case UNPARKED, UNBLOCKED, YIELDED -> {
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// unmounted, runnable
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}
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case PARKING, TIMED_PARKING, YIELDING -> {
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case PARKING, TIMED_PARKING, BLOCKING, YIELDING, WAITING, TIMED_WAITING -> {
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return null; // in transition
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}
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default -> throw new InternalError("" + initialState);
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@ -1073,7 +1207,7 @@ final class VirtualThread extends BaseVirtualThread {
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setState(initialState);
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}
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boolean resubmit = switch (initialState) {
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case UNPARKED, YIELDED -> {
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case UNPARKED, UNBLOCKED, YIELDED -> {
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// resubmit as task may have run while suspended
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yield true;
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}
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@ -1081,6 +1215,15 @@ final class VirtualThread extends BaseVirtualThread {
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// resubmit if unparked while suspended
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yield parkPermit && compareAndSetState(initialState, UNPARKED);
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}
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case BLOCKED -> {
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// resubmit if unblocked while suspended
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yield blockPermit && compareAndSetState(BLOCKED, UNBLOCKED);
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}
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case WAIT, TIMED_WAIT -> {
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// resubmit if notified or interrupted while waiting (Object.wait)
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// waitTimeoutExpired will retry if the timed expired when suspended
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yield (notified || interrupted) && compareAndSetState(initialState, UNBLOCKED);
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}
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default -> throw new InternalError();
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};
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if (resubmit) {
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@ -1175,6 +1318,14 @@ final class VirtualThread extends BaseVirtualThread {
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return interruptLock;
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}
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/**
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* Returns a lock object for coordinating timed-wait setup and timeout handling.
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*/
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private Object timedWaitLock() {
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// use this object for now to avoid the overhead of introducing another lock
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return runContinuation;
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}
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/**
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* Disallow the current thread be suspended or preempted.
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*/
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@ -1205,6 +1356,10 @@ final class VirtualThread extends BaseVirtualThread {
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return U.compareAndSetInt(this, STATE, expectedValue, newValue);
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}
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private boolean compareAndSetOnWaitingList(boolean expectedValue, boolean newValue) {
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return U.compareAndSetBoolean(this, ON_WAITING_LIST, expectedValue, newValue);
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}
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private void setParkPermit(boolean newValue) {
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if (parkPermit != newValue) {
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parkPermit = newValue;
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@ -1219,10 +1374,6 @@ final class VirtualThread extends BaseVirtualThread {
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}
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}
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private void setParkTimeout(long timeout) {
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parkTimeout = timeout;
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}
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private void setCarrierThread(Thread carrier) {
|
||||
// U.putReferenceRelease(this, CARRIER_THREAD, carrier);
|
||||
this.carrierThread = carrier;
|
||||
|
|
@ -1255,9 +1406,6 @@ final class VirtualThread extends BaseVirtualThread {
|
|||
|
||||
// ensure VTHREAD_GROUP is created, may be accessed by JVMTI
|
||||
var group = Thread.virtualThreadGroup();
|
||||
|
||||
// ensure VirtualThreadPinnedEvent is loaded/initialized
|
||||
U.ensureClassInitialized(VirtualThreadPinnedEvent.class);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1338,18 +1486,37 @@ final class VirtualThread extends BaseVirtualThread {
|
|||
}
|
||||
|
||||
/**
|
||||
* Reads the value of the jdk.tracePinnedThreads property to determine if stack
|
||||
* traces should be printed when a carrier thread is pinned when a virtual thread
|
||||
* attempts to park.
|
||||
* Schedule virtual threads that are ready to be scheduled after they blocked on
|
||||
* monitor enter.
|
||||
*/
|
||||
private static int tracePinningMode() {
|
||||
String propValue = GetPropertyAction.privilegedGetProperty("jdk.tracePinnedThreads");
|
||||
if (propValue != null) {
|
||||
if (propValue.length() == 0 || "full".equalsIgnoreCase(propValue))
|
||||
return 1;
|
||||
if ("short".equalsIgnoreCase(propValue))
|
||||
return 2;
|
||||
private static void unblockVirtualThreads() {
|
||||
while (true) {
|
||||
VirtualThread vthread = takeVirtualThreadListToUnblock();
|
||||
while (vthread != null) {
|
||||
assert vthread.onWaitingList;
|
||||
VirtualThread nextThread = vthread.next;
|
||||
|
||||
// remove from list and unblock
|
||||
vthread.next = null;
|
||||
boolean changed = vthread.compareAndSetOnWaitingList(true, false);
|
||||
assert changed;
|
||||
vthread.unblock();
|
||||
|
||||
vthread = nextThread;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Retrieves the list of virtual threads that are waiting to be unblocked, waiting
|
||||
* if necessary until a list of one or more threads becomes available.
|
||||
*/
|
||||
private static native VirtualThread takeVirtualThreadListToUnblock();
|
||||
|
||||
static {
|
||||
var unblocker = InnocuousThread.newThread("VirtualThread-unblocker",
|
||||
VirtualThread::unblockVirtualThreads);
|
||||
unblocker.setDaemon(true);
|
||||
unblocker.start();
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue