/// <summary>
/// Registers a callback object. If cancellation has already occurred, the
/// callback will have been run by the time this method returns.
/// </summary>
internal CancellationTokenRegistration InternalRegister(
Action <object> callback, object stateForCallback, SynchronizationContext targetSyncContext, ExecutionContext executionContext)
{
ThrowIfDisposed();
// the CancellationToken has already checked that the token is cancelable before calling this method.
Contract.Assert(CanBeCanceled, "Cannot register for uncancelable token src");
// if not canceled, register the event handlers
// if canceled already, run the callback synchronously
// Apart from the semantics of late-enlistment, this also ensures that during ExecuteCallbackHandlers() there
// will be no mutation of the _registeredCallbacks list
if (!IsCancellationRequested)
{
int myIndex = Thread.CurrentThread.ManagedThreadId % s_nLists;
CancellationCallbackInfo callbackInfo = new CancellationCallbackInfo(callback, stateForCallback, targetSyncContext, executionContext, this);
//allocate the callback list array
if (m_registeredCallbacksLists == null)
{
SparselyPopulatedArray <CancellationCallbackInfo>[] list = new SparselyPopulatedArray <CancellationCallbackInfo> [s_nLists];
Interlocked.CompareExchange(ref m_registeredCallbacksLists, list, null);
}
//allocate the actual lists on-demand to save mem in low-use situations, and to avoid false-sharing.
if (m_registeredCallbacksLists[myIndex] == null)
{
SparselyPopulatedArray <CancellationCallbackInfo> callBackArray = new SparselyPopulatedArray <CancellationCallbackInfo>(4);
Interlocked.CompareExchange(ref (m_registeredCallbacksLists[myIndex]), callBackArray, null);
}
// Now add the registration to the list.
SparselyPopulatedArray <CancellationCallbackInfo> callbacks = m_registeredCallbacksLists[myIndex];
SparselyPopulatedArrayAddInfo <CancellationCallbackInfo> addInfo = callbacks.Add(callbackInfo);
CancellationTokenRegistration registration = new CancellationTokenRegistration(this, callbackInfo, addInfo);
if (!IsCancellationRequested)
{
return(registration);
}
//If a cancellation has since come in, we will try to undo the registration and run the callback directly here.
bool deregisterOccurred = registration.TryDeregister();
if (!deregisterOccurred)
{
// the callback execution process must have snagged the callback for execution, so
// 1. wait for the callback to complete, then
// 2. return a dummy registration.
WaitForCallbackToComplete(callbackInfo);
return(new CancellationTokenRegistration());
}
}
// If cancellation already occurred, we run the callback on this thread and return an empty registration.
callback(stateForCallback);
return(new CancellationTokenRegistration());
}
internal CancellationTokenRegistration InternalRegister(Action <object> callback, object stateForCallback, SynchronizationContext targetSyncContext, ExecutionContext executionContext)
{
this.ThrowIfDisposed();
if (!this.IsCancellationRequested)
{
int index = Thread.CurrentThread.ManagedThreadId % s_nLists;
CancellationCallbackInfo element = new CancellationCallbackInfo(callback, stateForCallback, targetSyncContext, executionContext, this);
if (this.m_registeredCallbacksLists == null)
{
SparselyPopulatedArray <CancellationCallbackInfo>[] arrayArray = new SparselyPopulatedArray <CancellationCallbackInfo> [s_nLists];
Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo>[]>(ref this.m_registeredCallbacksLists, arrayArray, null);
}
if (this.m_registeredCallbacksLists[index] == null)
{
SparselyPopulatedArray <CancellationCallbackInfo> array = new SparselyPopulatedArray <CancellationCallbackInfo>(4);
Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo> >(ref this.m_registeredCallbacksLists[index], array, null);
}
SparselyPopulatedArrayAddInfo <CancellationCallbackInfo> registrationInfo = this.m_registeredCallbacksLists[index].Add(element);
CancellationTokenRegistration registration = new CancellationTokenRegistration(this, element, registrationInfo);
if (!this.IsCancellationRequested)
{
return(registration);
}
if (!registration.TryDeregister())
{
this.WaitForCallbackToComplete(element);
return(new CancellationTokenRegistration());
}
}
callback(stateForCallback);
return(new CancellationTokenRegistration());
}
// Token: 0x06003E40 RID: 15936 RVA: 0x000E71FC File Offset: 0x000E53FC
internal CancellationTokenRegistration InternalRegister(Action <object> callback, object stateForCallback, SynchronizationContext targetSyncContext, ExecutionContext executionContext)
{
if (AppContextSwitches.ThrowExceptionIfDisposedCancellationTokenSource)
{
this.ThrowIfDisposed();
}
if (!this.IsCancellationRequested)
{
if (this.m_disposed && !AppContextSwitches.ThrowExceptionIfDisposedCancellationTokenSource)
{
return(default(CancellationTokenRegistration));
}
int num = Thread.CurrentThread.ManagedThreadId % CancellationTokenSource.s_nLists;
CancellationCallbackInfo cancellationCallbackInfo = new CancellationCallbackInfo(callback, stateForCallback, targetSyncContext, executionContext, this);
SparselyPopulatedArray <CancellationCallbackInfo>[] array = this.m_registeredCallbacksLists;
if (array == null)
{
SparselyPopulatedArray <CancellationCallbackInfo>[] array2 = new SparselyPopulatedArray <CancellationCallbackInfo> [CancellationTokenSource.s_nLists];
array = Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo>[]>(ref this.m_registeredCallbacksLists, array2, null);
if (array == null)
{
array = array2;
}
}
SparselyPopulatedArray <CancellationCallbackInfo> sparselyPopulatedArray = Volatile.Read <SparselyPopulatedArray <CancellationCallbackInfo> >(ref array[num]);
if (sparselyPopulatedArray == null)
{
SparselyPopulatedArray <CancellationCallbackInfo> value = new SparselyPopulatedArray <CancellationCallbackInfo>(4);
Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo> >(ref array[num], value, null);
sparselyPopulatedArray = array[num];
}
SparselyPopulatedArrayAddInfo <CancellationCallbackInfo> registrationInfo = sparselyPopulatedArray.Add(cancellationCallbackInfo);
CancellationTokenRegistration result = new CancellationTokenRegistration(cancellationCallbackInfo, registrationInfo);
if (!this.IsCancellationRequested)
{
return(result);
}
if (!result.TryDeregister())
{
return(result);
}
}
callback(stateForCallback);
return(default(CancellationTokenRegistration));
}
internal CancellationTokenRegistration InternalRegister(Action <object> callback, object stateForCallback, SynchronizationContext targetSyncContext, ExecutionContext executionContext)
{
if (AppContextSwitches.ThrowExceptionIfDisposedCancellationTokenSource)
{
this.ThrowIfDisposed();
}
if (!this.IsCancellationRequested)
{
if (this.m_disposed && !AppContextSwitches.ThrowExceptionIfDisposedCancellationTokenSource)
{
return(new CancellationTokenRegistration());
}
int index = Thread.CurrentThread.ManagedThreadId % CancellationTokenSource.s_nLists;
CancellationCallbackInfo cancellationCallbackInfo = new CancellationCallbackInfo(callback, stateForCallback, targetSyncContext, executionContext, this);
SparselyPopulatedArray <CancellationCallbackInfo>[] sparselyPopulatedArrayArray1 = this.m_registeredCallbacksLists;
if (sparselyPopulatedArrayArray1 == null)
{
SparselyPopulatedArray <CancellationCallbackInfo>[] sparselyPopulatedArrayArray2 = new SparselyPopulatedArray <CancellationCallbackInfo> [CancellationTokenSource.s_nLists];
sparselyPopulatedArrayArray1 = Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo>[]>(ref this.m_registeredCallbacksLists, sparselyPopulatedArrayArray2, (SparselyPopulatedArray <CancellationCallbackInfo>[])null) ?? sparselyPopulatedArrayArray2;
}
SparselyPopulatedArray <CancellationCallbackInfo> sparselyPopulatedArray1 = Volatile.Read <SparselyPopulatedArray <CancellationCallbackInfo> >(ref sparselyPopulatedArrayArray1[index]);
if (sparselyPopulatedArray1 == null)
{
SparselyPopulatedArray <CancellationCallbackInfo> sparselyPopulatedArray2 = new SparselyPopulatedArray <CancellationCallbackInfo>(4);
Interlocked.CompareExchange <SparselyPopulatedArray <CancellationCallbackInfo> >(ref sparselyPopulatedArrayArray1[index], sparselyPopulatedArray2, (SparselyPopulatedArray <CancellationCallbackInfo>)null);
sparselyPopulatedArray1 = sparselyPopulatedArrayArray1[index];
}
SparselyPopulatedArrayAddInfo <CancellationCallbackInfo> registrationInfo = sparselyPopulatedArray1.Add(cancellationCallbackInfo);
CancellationTokenRegistration tokenRegistration = new CancellationTokenRegistration(cancellationCallbackInfo, registrationInfo);
if (!this.IsCancellationRequested || !tokenRegistration.TryDeregister())
{
return(tokenRegistration);
}
}
callback(stateForCallback);
return(new CancellationTokenRegistration());
}
private void ExecuteCallbackHandlers(bool throwOnFirstException)
{
List <Exception> exceptionList = (List <Exception>)null;
SparselyPopulatedArray <CancellationCallbackInfo>[] sparselyPopulatedArrayArray = this.m_registeredCallbacksLists;
if (sparselyPopulatedArrayArray == null)
{
Interlocked.Exchange(ref this.m_state, 3);
}
else
{
try
{
for (int index = 0; index < sparselyPopulatedArrayArray.Length; ++index)
{
SparselyPopulatedArray <CancellationCallbackInfo> sparselyPopulatedArray = Volatile.Read <SparselyPopulatedArray <CancellationCallbackInfo> >(ref sparselyPopulatedArrayArray[index]);
if (sparselyPopulatedArray != null)
{
for (SparselyPopulatedArrayFragment <CancellationCallbackInfo> currArrayFragment = sparselyPopulatedArray.Tail; currArrayFragment != null; currArrayFragment = currArrayFragment.Prev)
{
for (int currArrayIndex = currArrayFragment.Length - 1; currArrayIndex >= 0; --currArrayIndex)
{
this.m_executingCallback = currArrayFragment[currArrayIndex];
if (this.m_executingCallback != null)
{
CancellationCallbackCoreWorkArguments args = new CancellationCallbackCoreWorkArguments(currArrayFragment, currArrayIndex);
try
{
if (this.m_executingCallback.TargetSyncContext != null)
{
this.m_executingCallback.TargetSyncContext.Send(new SendOrPostCallback(this.CancellationCallbackCoreWork_OnSyncContext), (object)args);
this.ThreadIDExecutingCallbacks = Thread.CurrentThread.ManagedThreadId;
}
else
{
this.CancellationCallbackCoreWork(args);
}
}
catch (Exception ex)
{
if (throwOnFirstException)
{
throw;
}
else
{
if (exceptionList == null)
{
exceptionList = new List <Exception>();
}
exceptionList.Add(ex);
}
}
}
}
}
}
}
}
finally
{
this.m_state = 3;
this.m_executingCallback = (CancellationCallbackInfo)null;
Thread.MemoryBarrier();
}
if (exceptionList != null)
{
throw new AggregateException((IEnumerable <Exception>)exceptionList);
}
}
}
/// <summary>
/// Invoke the Canceled event.
/// </summary>
/// <remarks>
/// The handlers are invoked synchronously in LIFO order.
/// </remarks>
private void ExecuteCallbackHandlers(bool throwOnFirstException)
{
Contract.Assert(IsCancellationRequested, "ExecuteCallbackHandlers should only be called after setting IsCancellationRequested->true");
Contract.Assert(ThreadIDExecutingCallbacks != -1, "ThreadIDExecutingCallbacks should have been set.");
// Design decision: call the delegates in LIFO order so that callbacks fire 'deepest first'.
// This is intended to help with nesting scenarios so that child enlisters cancel before their parents.
List <Exception> exceptionList = null;
SparselyPopulatedArray <CancellationCallbackInfo>[] callbackLists = m_registeredCallbacksLists;
// If there are no callbacks to run, we can safely exit. Any races to lazy initialize it
// will see IsCancellationRequested and will then run the callback themselves.
if (callbackLists == null)
{
Interlocked.Exchange(ref m_state, NOTIFYINGCOMPLETE);
return;
}
try
{
for (int index = 0; index < callbackLists.Length; index++)
{
SparselyPopulatedArray <CancellationCallbackInfo> list = callbackLists[index];
if (list != null)
{
SparselyPopulatedArrayFragment <CancellationCallbackInfo> currArrayFragment = list.Tail;
while (currArrayFragment != null)
{
for (int i = currArrayFragment.Length - 1; i >= 0; i--)
{
// 1a. publish the indended callback, to ensure ctr.Dipose can tell if a wait is necessary.
// 1b. transition to the target syncContext and continue there..
// On the target SyncContext.
// 2. actually remove the callback
// 3. execute the callback
// re:#2 we do the remove on the syncCtx so that we can be sure we have control of the syncCtx before
// grabbing the callback. This prevents a deadlock if ctr.Dispose() might run on the syncCtx too.
m_executingCallback = currArrayFragment[i];
if (m_executingCallback != null)
{
//Transition to the target sync context (if necessary), and continue our work there.
CancellationCallbackCoreWorkArguments args = new CancellationCallbackCoreWorkArguments(currArrayFragment, i);
// marshal exceptions: either aggregate or perform an immediate rethrow
// We assume that syncCtx.Send() has forwarded on user exceptions when appropriate.
try
{
if (m_executingCallback.TargetSyncContext != null)
{
m_executingCallback.TargetSyncContext.Send(CancellationCallbackCoreWork_OnSyncContext, args);
// CancellationCallbackCoreWork_OnSyncContext may have altered ThreadIDExecutingCallbacks, so reset it.
ThreadIDExecutingCallbacks = Thread.CurrentThread.ManagedThreadId;
}
else
{
CancellationCallbackCoreWork_OnSyncContext(args);
}
}
catch (Exception ex)
{
if (throwOnFirstException)
{
throw;
}
// Otherwise, log it and proceed.
if (exceptionList == null)
{
exceptionList = new List <Exception>();
}
exceptionList.Add(ex);
}
}
}
currArrayFragment = currArrayFragment.Prev;
}
}
}
}
finally
{
m_state = NOTIFYINGCOMPLETE;
m_executingCallback = null;
Thread.MemoryBarrier(); // for safety, prevent reorderings crossing this point and seeing inconsistent state.
}
if (exceptionList != null)
{
Contract.Assert(exceptionList.Count > 0, "Expected exception count > 0");
throw new AggregateException(exceptionList);
}
}
private void ExecuteCallbackHandlers(bool throwOnFirstException)
{
List <Exception> list = null;
SparselyPopulatedArray <CancellationCallbackInfo>[] registeredCallbacksLists = this.m_registeredCallbacksLists;
if (registeredCallbacksLists == null)
{
Interlocked.Exchange(ref this.m_state, 3);
return;
}
try
{
for (int i = 0; i < registeredCallbacksLists.Length; i++)
{
SparselyPopulatedArray <CancellationCallbackInfo> sparselyPopulatedArray = Volatile.Read <SparselyPopulatedArray <CancellationCallbackInfo> >(ref registeredCallbacksLists[i]);
if (sparselyPopulatedArray != null)
{
for (SparselyPopulatedArrayFragment <CancellationCallbackInfo> sparselyPopulatedArrayFragment = sparselyPopulatedArray.Tail; sparselyPopulatedArrayFragment != null; sparselyPopulatedArrayFragment = sparselyPopulatedArrayFragment.Prev)
{
for (int j = sparselyPopulatedArrayFragment.Length - 1; j >= 0; j--)
{
this.m_executingCallback = sparselyPopulatedArrayFragment[j];
if (this.m_executingCallback != null)
{
CancellationCallbackCoreWorkArguments cancellationCallbackCoreWorkArguments = new CancellationCallbackCoreWorkArguments(sparselyPopulatedArrayFragment, j);
try
{
if (this.m_executingCallback.TargetSyncContext != null)
{
this.m_executingCallback.TargetSyncContext.Send(new SendOrPostCallback(this.CancellationCallbackCoreWork_OnSyncContext), cancellationCallbackCoreWorkArguments);
this.ThreadIDExecutingCallbacks = Thread.CurrentThread.ManagedThreadId;
}
else
{
this.CancellationCallbackCoreWork(cancellationCallbackCoreWorkArguments);
}
}
catch (Exception item)
{
if (throwOnFirstException)
{
throw;
}
if (list == null)
{
list = new List <Exception>();
}
list.Add(item);
}
}
}
}
}
}
}
finally
{
this.m_state = 3;
this.m_executingCallback = null;
Thread.MemoryBarrier();
}
if (list != null)
{
throw new AggregateException(list);
}
}
private void ExecuteCallbackHandlers(bool throwOnFirstException)
{
List <Exception> innerExceptions = null;
SparselyPopulatedArray <CancellationCallbackInfo>[] registeredCallbacksLists = this.m_registeredCallbacksLists;
if (registeredCallbacksLists == null)
{
Interlocked.Exchange(ref this.m_state, 3);
}
else
{
try
{
for (int i = 0; i < registeredCallbacksLists.Length; i++)
{
SparselyPopulatedArray <CancellationCallbackInfo> array = registeredCallbacksLists[i];
if (array != null)
{
for (SparselyPopulatedArrayFragment <CancellationCallbackInfo> fragment = array.Tail; fragment != null; fragment = fragment.Prev)
{
for (int j = fragment.Length - 1; j >= 0; j--)
{
this.m_executingCallback = fragment[j];
if (this.m_executingCallback != null)
{
CancellationCallbackCoreWorkArguments state = new CancellationCallbackCoreWorkArguments(fragment, j);
try
{
if (this.m_executingCallback.TargetSyncContext != null)
{
this.m_executingCallback.TargetSyncContext.Send(new SendOrPostCallback(this.CancellationCallbackCoreWork_OnSyncContext), state);
this.ThreadIDExecutingCallbacks = Thread.CurrentThread.ManagedThreadId;
}
else
{
this.CancellationCallbackCoreWork_OnSyncContext(state);
}
}
catch (Exception exception)
{
if (throwOnFirstException)
{
throw;
}
if (innerExceptions == null)
{
innerExceptions = new List <Exception>();
}
innerExceptions.Add(exception);
}
}
}
}
}
}
}
finally
{
this.m_state = 3;
this.m_executingCallback = null;
Thread.MemoryBarrier();
}
if (innerExceptions != null)
{
throw new AggregateException(innerExceptions);
}
}
}
