/**
* Spins/yields/blocks until node s is matched or caller gives up.
*
* @param s the waiting node
* @param pred the predecessor of s, or s itself if it has no predecessor, or null if unknown (the
* null case does not occur in any current calls but may in possible future extensions)
* @param e the comparison value for checking match
* @param timed if true, wait only until timeout elapses
* @param nanos timeout in nanosecs, used only if timed is true
* @return matched item, or e if unmatched on interrupt or timeout
*/
private E awaitMatch(Node s, Node pred, E e, boolean timed, long nanos) {
final long deadline = timed ? System.nanoTime() + nanos : 0L;
Thread w = Thread.currentThread();
int spins = -1; // initialized after first item and cancel checks
ThreadLocalRandom randomYields = null; // bound if needed
for (; ; ) {
Object item = s.item;
if (item != e) { // matched
// assert item != s;
s.forgetContents(); // avoid garbage
return LinkedTransferQueue.<E>cast(item);
}
if ((w.isInterrupted() || (timed && nanos <= 0)) && s.casItem(e, FORGOTTEN)) { // cancel
unsplice(pred, s);
return e;
}
if (spins < 0) { // establish spins at/near front
if ((spins = spinsFor(pred, s.isData)) > 0) randomYields = ThreadLocalRandom.current();
} else if (spins > 0) { // spin
--spins;
if (randomYields.nextInt(CHAINED_SPINS) == 0) Thread.yield(); // occasionally yield
} else if (s.waiter == null) {
s.waiter = w; // request unpark then recheck
} else if (timed) {
nanos = deadline - System.nanoTime();
if (nanos > 0L) LockSupport.parkNanos(this, nanos);
} else {
LockSupport.park(this);
}
}
}
public static void waitForRehashToComplete(Cache... caches) {
// give it 1 second to start rehashing
// TODO Should look at the last committed view instead and check if it contains all the caches
LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(1));
int gracetime = 30000; // 30 seconds?
long giveup = System.currentTimeMillis() + gracetime;
for (Cache c : caches) {
CacheViewsManager cacheViewsManager =
TestingUtil.extractGlobalComponent(c.getCacheManager(), CacheViewsManager.class);
RpcManager rpcManager = TestingUtil.extractComponent(c, RpcManager.class);
while (cacheViewsManager.getCommittedView(c.getName()).getMembers().size() != caches.length) {
if (System.currentTimeMillis() > giveup) {
String message =
String.format(
"Timed out waiting for rehash to complete on node %s, expected member list is %s, current member list is %s!",
rpcManager.getAddress(),
Arrays.toString(caches),
cacheViewsManager.getCommittedView(c.getName()));
log.error(message);
throw new RuntimeException(message);
}
LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(100));
}
log.trace("Node " + rpcManager.getAddress() + " finished rehash task.");
}
}
@Override
public void run() {
int m;
do {
while (waiting) {
LockSupport.park();
}
m = message;
waiting = true;
next.message = m - 1;
next.waiting = false;
LockSupport.unpark(next);
} while (m > 0);
}
// Can't throw.
private void cancelConnectionWaiterLocked(ConnectionWaiter waiter) {
if (waiter.mAssignedConnection != null || waiter.mException != null) {
// Waiter is done waiting but has not woken up yet.
return;
}
// Waiter must still be waiting. Dequeue it.
ConnectionWaiter predecessor = null;
ConnectionWaiter current = mConnectionWaiterQueue;
while (current != waiter) {
assert current != null;
predecessor = current;
current = current.mNext;
}
if (predecessor != null) {
predecessor.mNext = waiter.mNext;
} else {
mConnectionWaiterQueue = waiter.mNext;
}
// Send the waiter an exception and unpark it.
waiter.mException = new OperationCanceledException();
LockSupport.unpark(waiter.mThread);
// Check whether removing this waiter will enable other waiters to make progress.
wakeConnectionWaitersLocked();
}
// Can't throw.
private void wakeConnectionWaitersLocked() {
// Unpark all waiters that have requests that we can fulfill.
// This method is designed to not throw runtime exceptions, although we might send
// a waiter an exception for it to rethrow.
ConnectionWaiter predecessor = null;
ConnectionWaiter waiter = mConnectionWaiterQueue;
boolean primaryConnectionNotAvailable = false;
boolean nonPrimaryConnectionNotAvailable = false;
while (waiter != null) {
boolean unpark = false;
if (!mIsOpen) {
unpark = true;
} else {
try {
SQLiteConnection connection = null;
if (!waiter.mWantPrimaryConnection && !nonPrimaryConnectionNotAvailable) {
connection =
tryAcquireNonPrimaryConnectionLocked(
waiter.mSql, waiter.mConnectionFlags); // might throw
if (connection == null) {
nonPrimaryConnectionNotAvailable = true;
}
}
if (connection == null && !primaryConnectionNotAvailable) {
connection = tryAcquirePrimaryConnectionLocked(waiter.mConnectionFlags); // might throw
if (connection == null) {
primaryConnectionNotAvailable = true;
}
}
if (connection != null) {
waiter.mAssignedConnection = connection;
unpark = true;
} else if (nonPrimaryConnectionNotAvailable && primaryConnectionNotAvailable) {
// There are no connections available and the pool is still open.
// We cannot fulfill any more connection requests, so stop here.
break;
}
} catch (RuntimeException ex) {
// Let the waiter handle the exception from acquiring a connection.
waiter.mException = ex;
unpark = true;
}
}
final ConnectionWaiter successor = waiter.mNext;
if (unpark) {
if (predecessor != null) {
predecessor.mNext = successor;
} else {
mConnectionWaiterQueue = successor;
}
waiter.mNext = null;
LockSupport.unpark(waiter.mThread);
} else {
predecessor = waiter;
}
waiter = successor;
}
}
/** @see Sequencer#next(int) */
@Override
public long next(int n) {
if (n < 1) {
throw new IllegalArgumentException("n must be > 0");
}
long nextValue = this.nextValue;
long nextSequence = nextValue + n;
long wrapPoint = nextSequence - bufferSize;
long cachedGatingSequence = this.cachedValue;
if (wrapPoint > cachedGatingSequence || cachedGatingSequence > nextValue) {
long minSequence;
while (wrapPoint > (minSequence = Sequencer.getMinimumSequence(gatingSequences, nextValue))) {
if (spinObserver != null) {
spinObserver.accept(null);
}
LockSupport.parkNanos(1L); // TODO: Use waitStrategy to spin?
}
this.cachedValue = minSequence;
}
this.nextValue = nextSequence;
return nextSequence;
}
@Override
public void generate(int level) {
File file = new File("outputfile");
while (true) {
for (long i = 0; i < 1000 * level; i++) {
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(file));
for (long j = 0; j < 1000; j++) writer.write("1234567890qwertyuiopasdfghjklzxcvbvnm");
writer.close();
Scanner scanner = new Scanner(new FileReader(file));
while (scanner.hasNextLine()) scanner.nextLine();
scanner.close();
} catch (IOException e) {
System.out.println("I/O error");
file.delete();
}
}
workUnits.getAndIncrement();
java.util.concurrent.locks.LockSupport.parkNanos(1);
}
}
/**
* The one calling read doesn't actually read, since reading is up to the thread in here. Instead
* the caller just waits for this thread to have fully read the next buffer and flips over to that
* buffer, returning it.
*/
@Override
public SectionedCharBuffer read(SectionedCharBuffer buffer, int from) throws IOException {
// are we still healthy and all that?
assertHealthy();
// wait until thread has made data available
while (!hasReadAhead) {
parkAWhile();
assertHealthy();
}
// flip the buffers
SectionedCharBuffer resultBuffer = theOtherBuffer;
buffer.compact(resultBuffer, from);
theOtherBuffer = buffer;
// handle source notifications that has happened
if (newSourceDescription != null) {
sourceDescription = newSourceDescription;
// At this point the new source is official, so tell that to our external monitors
for (SourceMonitor monitor : sourceMonitors) {
monitor.notify(newSourceDescription);
}
newSourceDescription = null;
}
// wake up the reader... there's stuff to do, data to read
hasReadAhead = false;
LockSupport.unpark(this);
return resultBuffer;
}
@Test
public void testTransactionAtomicity_whenMultiMapGetIsUsed_withTransaction()
throws InterruptedException {
final HazelcastInstance hz = Hazelcast.newHazelcastInstance(createConfigWithDummyTxService());
final String name = HazelcastTestSupport.generateRandomString(5);
Thread producerThread = startProducerThread(hz, name);
try {
IQueue<String> q = hz.getQueue(name);
for (int i = 0; i < 1000; i++) {
String id = q.poll();
if (id != null) {
TransactionContext tx = hz.newTransactionContext();
try {
tx.beginTransaction();
TransactionalMultiMap<Object, Object> multiMap = tx.getMultiMap(name);
Collection<Object> values = multiMap.get(id);
assertFalse(values.isEmpty());
multiMap.remove(id);
tx.commitTransaction();
} catch (TransactionException e) {
tx.rollbackTransaction();
e.printStackTrace();
}
} else {
LockSupport.parkNanos(100);
}
}
} finally {
stopProducerThread(producerThread);
}
}
protected void await(boolean throwInterrupt) throws InterruptedException {
if (!signaled.get()) {
lock.acquired = false;
sendAwaitConditionRequest(lock.name, lock.owner);
boolean interrupted = false;
while (!signaled.get()) {
parker.set(Thread.currentThread());
LockSupport.park(this);
if (Thread.interrupted()) {
// If we were interrupted and haven't received a response yet then we try to
// clean up the lock request and throw the exception
if (!signaled.get()) {
sendDeleteAwaitConditionRequest(lock.name, lock.owner);
throw new InterruptedException();
}
// In the case that we were signaled and interrupted
// we want to return the signal but still interrupt
// our thread
interrupted = true;
}
}
if (interrupted) Thread.currentThread().interrupt();
}
// We set as if this signal was no released. This way if the
// condition is reused again, but the client condition isn't lost
// we won't think we were signaled immediately
signaled.set(false);
}
@Override
public boolean offer(WaitStrategy.Offerable o) throws InterruptedException {
while (!o.offer()) {
LockSupport.parkNanos(1l);
}
return true;
}
public static void main(String[] args) throws InterruptedException {
thread1.start();
Thread.sleep(100);
thread2.start();
thread1.interrupt();
LockSupport.unpark(thread2);
}
public void await() {
long spin = 1;
while (!done) {
LockSupport.parkNanos(spin++);
}
}
private boolean sendMessages(
RingBuffer<byte[]> ringBuffer, long messagesPerSecond, int runtimeSeconds)
throws InterruptedException {
LOGGER.info("Rate: " + messagesPerSecond + ", for " + runtimeSeconds + "s");
long runtimeNanos = TimeUnit.SECONDS.toNanos(runtimeSeconds);
long t0 = System.nanoTime();
long delta = 0;
long sent = 0;
try {
do {
delta = System.nanoTime() - t0;
long shouldHaveSent = (messagesPerSecond * delta) / 1000000000;
for (; sent < shouldHaveSent; sent++) {
if (!send(ringBuffer)) {
return false;
}
}
LockSupport.parkNanos(1);
} while (delta <= runtimeNanos);
Thread.sleep(1000);
return ringBuffer.hasAvailableCapacity(ringBuffer.getBufferSize());
} finally {
while (!ringBuffer.hasAvailableCapacity(ringBuffer.getBufferSize())) {
Thread.sleep(1000);
}
}
}
// 处理无数据的情况，避免空循环挂死
private void applyWait(int fullTimes) {
int newFullTimes = fullTimes > maxFullTimes ? maxFullTimes : fullTimes;
if (fullTimes <= 3) { // 3次以内
Thread.yield();
} else { // 超过3次，最多只sleep 10ms
LockSupport.parkNanos(1000 * 1000L * newFullTimes);
}
}
protected void pause(int delayNS) {
if (delayNS < 1) return;
long start = System.nanoTime();
if (delayNS >= 1000 * 1000) LockSupport.parkNanos(delayNS - 1000 * 1000); // only ms accuracy.
while (System.nanoTime() - start < delayNS) {
Thread.yield();
}
}
/**
* Spins/blocks until node s is matched by a fulfill operation.
*
* @param s the waiting node
* @param timed true if timed wait
* @param nanos timeout value
* @return matched node, or s if cancelled
*/
SNode awaitFulfill(SNode s, boolean timed, long nanos) {
/*
* When a node/thread is about to block, it sets its waiter
* field and then rechecks state at least one more time
* before actually parking, thus covering race vs
* fulfiller noticing that waiter is non-null so should be
* woken.
*
* When invoked by nodes that appear at the point of call
* to be at the head of the stack, calls to park are
* preceded by spins to avoid blocking when producers and
* consumers are arriving very close in time. This can
* happen enough to bother only on multiprocessors.
*
* The order of checks for returning out of main loop
* reflects fact that interrupts have precedence over
* normal returns, which have precedence over
* timeouts. (So, on timeout, one last check for match is
* done before giving up.) Except that calls from untimed
* SynchronousQueue.{poll/offer} don't check interrupts
* and don't wait at all, so are trapped in transfer
* method rather than calling awaitFulfill.
*/
long lastTime = timed ? System.nanoTime() : 0;
Thread w = Thread.currentThread();
SNode h = head;
int spins = (shouldSpin(s) ? (timed ? maxTimedSpins : maxUntimedSpins) : 0);
for (; ; ) {
if (w.isInterrupted()) s.tryCancel();
SNode m = s.match;
if (m != null) return m;
if (timed) {
long now = System.nanoTime();
nanos -= now - lastTime;
lastTime = now;
if (nanos <= 0) {
s.tryCancel();
continue;
}
}
if (spins > 0) spins = shouldSpin(s) ? (spins - 1) : 0;
else if (s.waiter == null) s.waiter = w; // establish waiter so can park next iter
else if (!timed) LockSupport.park(this);
else if (nanos > spinForTimeoutThreshold) LockSupport.parkNanos(this, nanos);
}
}
public void destroy() {
_isClosed = true;
wake();
Thread thread = _thread;
if (thread != null) LockSupport.unpark(thread);
}
@Override
public int idle(final int idleCounter) {
if (idleCounter > 200) {
LockSupport.parkNanos(1L);
} else if (idleCounter > 100) {
Thread.yield();
}
return idleCounter + 1;
}
/** Tries to artificially match a data node -- used by remove. */
final boolean tryMatchData() {
// assert isData;
Object x = item;
if (x != null && x != FORGOTTEN && casItem(x, null)) {
LockSupport.unpark(waiter);
return true;
}
return false;
}
public T get(long timeout, TimeUnit unit) {
if (isDone()) {
return getResultValue();
}
Thread thread = Thread.currentThread();
// _thread = thread;
long expires = unit.toMillis(timeout) + System.currentTimeMillis();
while (true) {
if (isDone()) {
return getResultValue();
} else if (_state == FutureState.ASYNC) {
Result<Object> chain = _chain;
Object chainValue = _chainValue;
_chain = null;
_chainValue = null;
_state = FutureState.INIT;
// _thread = null;
chain.completeFuture(chainValue);
/*
if (isDone()) {
return getResultValue();
}
*/
// _thread = thread;
} else {
if (ServiceRef.flushOutboxAndExecuteLast()) {
// if pending messages, continue to process them
continue;
}
// ServiceRef.flushOutbox();
_thread = thread;
if (_state.isParkRequired()) {
if (expires < System.currentTimeMillis()) {
_thread = null;
throw new ServiceExceptionFutureTimeout("future timeout " + timeout + " " + unit);
}
LockSupport.parkUntil(expires);
}
_thread = null;
}
}
}
@Override
public final void run() {
String oldName = null;
try {
_thread = Thread.currentThread();
_thread.setContextClassLoader(_classLoader);
oldName = _thread.getName();
_thread.setName(getThreadName());
onThreadStart();
long now = getCurrentTimeActual();
long expires = now + _workerIdleTimeout;
do {
while (_taskState.getAndSet(TASK_SLEEP) == TASK_READY) {
_thread.setContextClassLoader(_classLoader);
long delta = runTask();
now = getCurrentTimeActual();
if (delta < 0) {
expires = now + _workerIdleTimeout;
} else {
expires = now + delta;
}
}
if (isClosed()) return;
if (_taskState.compareAndSet(TASK_SLEEP, TASK_PARK)) {
Thread.interrupted();
LockSupport.parkUntil(expires);
if (isPermanent()) _taskState.set(TASK_READY);
}
} while (_taskState.get() == TASK_READY || isPermanent() || getCurrentTimeActual() < expires);
} catch (Throwable e) {
WarningService.sendCurrentWarning(this, e);
log.log(Level.WARNING, e.toString(), e);
} finally {
Thread thread = _thread;
_thread = null;
_isActive.set(false);
if (_taskState.get() == TASK_READY) wake();
onThreadComplete();
if (thread != null && oldName != null) thread.setName(oldName);
}
}
@Override
public T take(WaitStrategy.Takeable<T> t) throws InterruptedException {
T result;
while ((result = t.take()) == null) {
LockSupport.parkNanos(1l);
}
return result;
}
/**
* Tries to match node s to this node, if so, waking up thread. Fulfillers call tryMatch to
* identify their waiters. Waiters block until they have been matched.
*
* @param s the node to match
* @return true if successfully matched to s
*/
boolean tryMatch(SNode s) {
if (match == null && UNSAFE.compareAndSwapObject(this, matchOffset, null, s)) {
Thread w = waiter;
if (w != null) { // waiters need at most one unpark
waiter = null;
LockSupport.unpark(w);
}
return true;
}
return match == s;
}
@Override
public void run() {
synchronized (u) {
System.out.println("in" + getName());
LockSupport.park();
if (Thread.interrupted()) {
System.out.println(getName() + ": is interrupted");
}
}
System.out.println("execute done");
}
@Benchmark
@Override
public final void benchmark() throws InterruptedException {
first.message = ringSize;
first.waiting = false;
LockSupport.unpark(first);
for (Worker worker : workers) {
worker.join();
}
}
@Override
public void ok(T result) {
_value = result;
_state = FutureState.COMPLETE;
Thread thread = _thread;
if (thread != null) {
LockSupport.unpark(thread);
}
}
@Override
public void completeFuture(T value) {
_value = value;
_state = FutureState.COMPLETE;
Thread thread = _thread;
if (thread != null) {
LockSupport.unpark(thread);
}
}
@Override
public <U> void completeFuture(ResultChain<U> chain, U chainValue) {
_chain = (Result) chain;
_chainValue = chainValue;
_state = FutureState.ASYNC;
Thread thread = _thread;
if (thread != null) {
LockSupport.unpark(thread);
}
}
public static void waitForRehashToComplete(Cache cache, int groupSize) {
LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(1));
int gracetime = 30000; // 30 seconds?
long giveup = System.currentTimeMillis() + gracetime;
CacheViewsManager cacheViewsManager =
TestingUtil.extractGlobalComponent(cache.getCacheManager(), CacheViewsManager.class);
RpcManager rpcManager = TestingUtil.extractComponent(cache, RpcManager.class);
while (cacheViewsManager.getCommittedView(cache.getName()).getMembers().size() != groupSize) {
if (System.currentTimeMillis() > giveup) {
String message =
String.format(
"Timed out waiting for rehash to complete on node %s, expected member count %s, current member count is %s!",
rpcManager.getAddress(),
groupSize,
cacheViewsManager.getCommittedView(cache.getName()));
log.error(message);
throw new RuntimeException(message);
}
LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(100));
}
log.trace("Node " + rpcManager.getAddress() + " finished rehash task.");
}
