public override void PerformTest()
{
Log("Creating " + _numberOfThreads + " threads");
Thread[] threads = new Thread[_numberOfThreads];
for (int i = 0; i < _numberOfThreads; i++)
{
threads[i] = new Thread(Work, ThreadPriority.Normal);
}
_startedThreads = 0;
_startedThreadsLock = new Lock();
_allThreadsStartedLock = new Lock();
_allThreadsStartedCondition = new Condition(_allThreadsStartedLock);
_allThreadsStartedLock.Acquire();
Log("Starting " + _numberOfThreads + " threads"); // TODO: ParametizedThreadStart doesn't work properly
for (int i = 0; i < _numberOfThreads; i++)
{
threads[i].Start();
}
// wait for all threads to be running
_allThreadsStartedCondition.Await();
_allThreadsStartedLock.Release();
Log("Waiting for all threads to finish");
_semaphore.Acquire(_numberOfThreads); // wait for all threads to finish
Assert(_failedThreads + " threads failed the calculation", _failedThreads == 0);
Log("All " + _numberOfThreads + " threads finished");
}
public void TestAbortThread()
{
Lock sync = new Lock();
TimedCondition aborted = new TimedCondition(sync);
Thread testThread = new Thread(delegate()
{
try
{
Log("Test thread sleeping for 8 seconds..");
Thread.Sleep(8000);
}
catch (ThreadAbortException)
{
Log("Test thread aborted..");
aborted.Signal();
}
Fail("This line should never be executed");
});
testThread.Start();
sync.Acquire();
Log("Aborting test thread in 2 seconds. Sleeping...");
Thread.Sleep(2000);
Log("...awake! Going to abort the test thread.");
testThread.Abort();
Log("Called testThread.Abort()");
try
{
aborted.Await(12000);
}
catch (ConditionTimedOutException)
{
Fail("Thread was not aborted as expected!");
}
}
public static LockHolder Hold(Lock l)
{
LockHolder h;
l.Acquire();
h._lock = l;
return h;
}
public static LockHolder Hold(Lock l)
{
LockHolder h;
l.Acquire();
h._lock = l;
return(h);
}
public override void PerformTest()
{
_mainLock = new Lock();
Thread controllerThread = new Thread(ControllerThreadStart, ThreadPriority.Normal);
controllerThread.Name = "Controller Thread";
controllerThread.Start();
Thread.Sleep(2000);
Log("Main thread is trying to acquire the main lock...");
_mainLock.Acquire();
Log("Main thread got the main lock...");
}
public object Call(string method, object[] args, int timeout)
{
XmlHttpRequest xhr = XmlHttpRequestManager.GetXmlHttpRequest();
Lock l = new Lock();
l.Acquire();
TimedCondition condition = new TimedCondition(l);
OnReadyStateChangeHandler handler = new OnReadyStateChangeHandler(xhr, condition);
xhr.OnReadyStateChange = (NativeFunction)new VoidDelegate(handler.OnReadyStateChange);
xhr.Open("POST", ServerUrl, true, Username, Password);
xhr.SetRequestHeader(RpcMethodRequestHeader, method);
xhr.Send(Serialize(args));
if (timeout > 0)
{
try
{
// wait for timeout milliseconds
condition.Await(timeout);
}
catch (ConditionTimedOutException)
{
Logging.Debug("Request timed out!!!");
throw new JsonRpcCallTimedOutException(this, method, args, timeout);
}
}
else
{
// wait indefinitely
condition.Await();
}
// we have a response from the server, or we couldn't connect
Logging.Debug("Status code is: " + xhr.Status);
if (xhr.Status == 200)
{
Logging.Debug("Got 200! Response text is " + xhr.ResponseText);
return Deserialize(xhr.ResponseText);
}
else if (xhr.Status == 0)
{
Logging.Debug("Request timed out!!!");
throw new JsonRpcCallTimedOutException(this, method, args, 1000); // TODO: Extract into constant of 1000 ms. Also this should be some sort of connection refused exception instead
}
else
{
throw GenerateException(xhr.Status, method, args, xhr.ResponseText);
}
}
public void TestAbortThreadWithState()
{
Lock sync = new Lock();
TimedCondition aborted = new TimedCondition(sync);
Thread testThread = new Thread(delegate()
{
try
{
Log("Test thread sleeping for 8 seconds..");
Thread.Sleep(8000);
}
catch (ThreadAbortException e)
{
if (e.ExceptionState != null && e.ExceptionState.ToString() == "Exception state")
{
Log("Test thread aborted with state: " + e.ExceptionState);
aborted.Signal();
}
else
{
Log("Test thread aborted with unknown state: " + e.ExceptionState);
}
}
Fail("This line should never be executed");
});
testThread.Start();
sync.Acquire();
Log("Aborting test thread in 2 seconds");
Thread.Sleep(2000);
testThread.Abort("Exception state");
try
{
aborted.Await(12000);
}
catch (ConditionTimedOutException)
{
Fail("Thread was not aborted as expected!");
}
}
/// <summary>
/// Blocks the current thread until it can enter the <see cref="SemaphoreSlim"/>,
/// using a 32-bit signed integer to measure the time interval,
/// while observing a <see cref="T:System.Threading.CancellationToken"/>.
/// </summary>
/// <param name="millisecondsTimeout">The number of milliseconds to wait, or <see cref="Timeout.Infinite"/>(-1) to
/// wait indefinitely.</param>
/// <param name="cancellationToken">The <see cref="T:System.Threading.CancellationToken"/> to observe.</param>
/// <returns>true if the current thread successfully entered the <see cref="SemaphoreSlim"/>; otherwise, false.</returns>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="millisecondsTimeout"/> is a negative number other than -1,
/// which represents an infinite time-out.</exception>
/// <exception cref="System.OperationCanceledException"><paramref name="cancellationToken"/> was canceled.</exception>
public bool Wait(int millisecondsTimeout, CancellationToken cancellationToken)
{
CheckDispose();
// Validate input
if (millisecondsTimeout < -1)
{
throw new ArgumentOutOfRangeException(
"totalMilliSeconds", millisecondsTimeout, SR.SemaphoreSlim_Wait_TimeoutWrong);
}
cancellationToken.ThrowIfCancellationRequested();
uint startTime = 0;
if (millisecondsTimeout != Timeout.Infinite && millisecondsTimeout > 0)
{
startTime = TimeoutHelper.GetTime();
}
bool waitSuccessful = false;
Task <bool> asyncWaitTask = null;
bool lockTaken = false;
//Register for cancellation outside of the main lock.
//NOTE: Register/deregister inside the lock can deadlock as different lock acquisition orders could
// occur for (1)this.m_lockObj and (2)cts.internalLock
CancellationTokenRegistration cancellationTokenRegistration = cancellationToken.InternalRegisterWithoutEC(s_cancellationTokenCanceledEventHandler, this);
try
{
// Perf: first spin wait for the count to be positive, but only up to the first planned yield.
// This additional amount of spinwaiting in addition
// to Monitor.Enter()’s spinwaiting has shown measurable perf gains in test scenarios.
//
SpinWait spin = new SpinWait();
while (m_currentCount == 0 && !spin.NextSpinWillYield)
{
spin.SpinOnce();
}
// entering the lock and incrementing waiters must not suffer a thread-abort, else we cannot
// clean up m_waitCount correctly, which may lead to deadlock due to non-woken waiters.
try { }
finally
{
m_lock.Acquire();
lockTaken = true;
if (lockTaken)
{
m_waitCount++;
}
}
// If there are any async waiters, for fairness we'll get in line behind
// then by translating our synchronous wait into an asynchronous one that we
// then block on (once we've released the lock).
if (m_asyncHead != null)
{
Debug.Assert(m_asyncTail != null, "tail should not be null if head isn't");
asyncWaitTask = WaitAsync(millisecondsTimeout, cancellationToken);
}
// There are no async waiters, so we can proceed with normal synchronous waiting.
else
{
// If the count > 0 we are good to move on.
// If not, then wait if we were given allowed some wait duration
OperationCanceledException oce = null;
if (m_currentCount == 0)
{
if (millisecondsTimeout == 0)
{
return(false);
}
// Prepare for the main wait...
// wait until the count become greater than zero or the timeout is expired
try
{
waitSuccessful = WaitUntilCountOrTimeout(millisecondsTimeout, startTime, cancellationToken);
}
catch (OperationCanceledException e) { oce = e; }
}
// Now try to acquire. We prioritize acquisition over cancellation/timeout so that we don't
// lose any counts when there are asynchronous waiters in the mix. Asynchronous waiters
// defer to synchronous waiters in priority, which means that if it's possible an asynchronous
// waiter didn't get released because a synchronous waiter was present, we need to ensure
// that synchronous waiter succeeds so that they have a chance to release.
Debug.Assert(!waitSuccessful || m_currentCount > 0,
"If the wait was successful, there should be count available.");
if (m_currentCount > 0)
{
waitSuccessful = true;
m_currentCount--;
}
else if (oce != null)
{
throw oce;
}
// Exposing wait handle which is lazily initialized if needed
if (m_waitHandle != null && m_currentCount == 0)
{
m_waitHandle.Reset();
}
}
}
finally
{
// Release the lock
if (lockTaken)
{
m_waitCount--;
m_lock.Release();
}
// Unregister the cancellation callback.
cancellationTokenRegistration.Dispose();
}
// If we had to fall back to asynchronous waiting, block on it
// here now that we've released the lock, and return its
// result when available. Otherwise, this was a synchronous
// wait, and whether we successfully acquired the semaphore is
// stored in waitSuccessful.
return((asyncWaitTask != null) ? asyncWaitTask.GetAwaiter().GetResult() : waitSuccessful);
}
private static XmlHttpRequest _doSimpleXmlHttpRequest(string url, RequestMethod method, string postData, string username, string password, int timeoutMs)
{
XmlHttpRequest xhr = GetXmlHttpRequest();
Lock l = new Lock();
l.Acquire();
Condition condition = new Condition(l);
if (_driverProcess == null)
{
throw new SystemException("XmlHttpRequestManager.Driver was not started.");
}
OnReadyStateChangeSignalHandler handler = new OnReadyStateChangeSignalHandler
{
XmlHttpRequest = xhr,
Condition = condition
};
// TODO: Use resource manager to ensure these signal senders and handlers get cleaned up
OnReadyStateChangeSignalSender signalSender = CreateOnReadyStateChangeSignalSender(handler);
try
{
xhr.OnReadyStateChange = (NativeFunction)new NativeVoidDelegate(signalSender.SendSignal);
string methodString;
if (method == RequestMethod.Get)
{
methodString = "GET";
}
else
{
methodString = "POST";
}
xhr.Open(methodString, url, true, username, password);
xhr.Send(postData);
if (timeoutMs > 0)
{
if (!condition.Await(timeoutMs))
{
xhr.OnReadyStateChange = null;
throw new XmlHttpRequestTimeoutException("Timed out waiting for " + url, xhr);
}
}
else
{
condition.Await();
}
// TODO: finally blocks are not executed if there is a return statement in the try block. fix that
}
finally
{
DestroyOnReadyStateChangeSignalSender(signalSender);
}
return xhr;
}
