public Task PulseAllAsync()
{
TaskCompletionSourceWithoutInlining <EmptyStruct>?tcs = null;
lock (this.syncObject)
{
// Atomically replace the completion source with a new, uncompleted source
// while capturing the previous one so we can complete it.
// This ensures that we don't leave a gap in time where WaitAsync() will
// continue to return completed Tasks due to a Pulse method which should
// execute instantaneously.
tcs = this.taskCompletionSource;
this.taskCompletionSource = this.CreateTaskSource();
this.isSet = false;
}
// Snap the Task that is exposed to the outside so we return that one.
// Once we complete the TaskCompletionSourceWithoutInlinining's task,
// the Task property will return the inner Task.
// PulseAllAsync should return the same Task that WaitAsync callers would have observed previously.
Task result = tcs.Task;
tcs.TrySetResult(default(EmptyStruct));
return(result);
}
public Task SetAsync()
{
TaskCompletionSourceWithoutInlining <EmptyStruct>?tcs = null;
bool transitionRequired = false;
lock (this.syncObject)
{
transitionRequired = !this.isSet;
tcs = this.taskCompletionSource;
this.isSet = true;
}
// Snap the Task that is exposed to the outside so we return that one.
// Once we complete the TaskCompletionSourceWithoutInlinining's task,
// the Task property will return the inner Task.
// SetAsync should return the same Task that WaitAsync callers would have observed previously.
Task result = tcs.Task;
if (transitionRequired)
{
tcs.TrySetResult(default(EmptyStruct));
}
return(result);
}