internal Enumerator(WeakKeyDictionary <TKey, TValue> dictionary)
{
Requires.NotNull(dictionary, nameof(dictionary));
this.enumerator = dictionary.dictionary.GetEnumerator();
this.current = default(KeyValuePair <TKey, TValue>);
}
/// <summary>
/// Adds a <see cref="JoinableTask"/> instance as one that is relevant to the async operation.
/// </summary>
/// <param name="joinChild">The <see cref="JoinableTask"/> to join as a child.</param>
internal JoinRelease AddDependency(JoinableTask joinChild)
{
Requires.NotNull(joinChild, nameof(joinChild));
if (this == joinChild)
{
// Joining oneself would be pointless.
return(default(JoinRelease));
}
using (this.Factory.Context.NoMessagePumpSynchronizationContext.Apply())
{
List <AsyncManualResetEvent> eventsNeedNotify = null;
lock (this.owner.Context.SyncContextLock)
{
if (this.childOrJoinedJobs == null)
{
this.childOrJoinedJobs = new WeakKeyDictionary <JoinableTask, int>(capacity: 3);
}
int refCount;
this.childOrJoinedJobs.TryGetValue(joinChild, out refCount);
this.childOrJoinedJobs[joinChild] = ++refCount;
if (refCount == 1)
{
// This constitutes a significant change, so we should apply synchronous task tracking to the new child.
var tasksNeedNotify = this.AddDependingSynchronousTaskToChild(joinChild);
if (tasksNeedNotify.Count > 0)
{
eventsNeedNotify = new List <AsyncManualResetEvent>(tasksNeedNotify.Count);
foreach (var taskToNotify in tasksNeedNotify)
{
if (taskToNotify.SynchronousTask.pendingEventSource == null || taskToNotify.TaskHasPendingMessages == taskToNotify.SynchronousTask)
{
taskToNotify.SynchronousTask.pendingEventSource = new WeakReference <JoinableTask>(taskToNotify.TaskHasPendingMessages);
}
taskToNotify.SynchronousTask.pendingEventCount += taskToNotify.NewPendingMessagesCount;
var notifyEvent = taskToNotify.SynchronousTask.queueNeedProcessEvent;
if (notifyEvent != null)
{
eventsNeedNotify.Add(notifyEvent);
}
}
}
}
}
// We explicitly do this outside our lock.
if (eventsNeedNotify != null)
{
foreach (var queueEvent in eventsNeedNotify)
{
queueEvent.PulseAll();
}
}
return(new JoinRelease(this, joinChild));
}
}
internal KeyEnumerator(WeakKeyDictionary <TKey, TValue> dictionary)
{
Requires.NotNull(dictionary, nameof(dictionary));
// Assign a value to Current to suppress CS8618. The Current property may have a null value at times,
// but the value will never be exposed to external code provided the code only accesses Current after a
// call to MoveNext returns true.
this.Current = default !;
internal KeyEnumerable(WeakKeyDictionary <TKey, TValue> dictionary)
{
Requires.NotNull(dictionary, nameof(dictionary));
this.dictionary = dictionary;
}
internal KeyEnumerator(WeakKeyDictionary <TKey, TValue> dictionary)
{
Requires.NotNull(dictionary, nameof(dictionary));
this.enumerator = dictionary.dictionary.GetEnumerator();
}
