internal static Task WhenAllCore(IList <Task> tasks)
{
bool all_completed = true;
foreach (var t in tasks)
{
if (t == null)
{
throw new ArgumentException("tasks", "the tasks argument contains a null element");
}
all_completed &= t.Status == TaskStatus.RanToCompletion;
}
if (all_completed)
{
return(TaskConstants.Finished);
}
var task = new Task(TaskActionInvoker.Empty, null, CancellationToken.None, TaskCreationOptions.None, null, TaskConstants.Finished);
task.SetupScheduler(TaskScheduler.Current);
var continuation = new WhenAllContinuation(task, tasks);
foreach (var t in tasks)
{
t.ContinueWith(continuation);
}
return(task);
}
internal static Task<TResult[]> WhenAllCore<TResult> (IList<Task<TResult>> tasks)
{
foreach (var t in tasks) {
if (t == null)
throw new ArgumentException ("tasks", "the tasks argument contains a null element");
}
var task = new Task<TResult[]> (TaskActionInvoker.Empty, null, CancellationToken.None, TaskCreationOptions.None, null, TaskConstants.Finished);
task.SetupScheduler (TaskScheduler.Current);
var continuation = new WhenAllContinuation<TResult> (task, tasks);
foreach (var t in tasks)
t.ContinueWith (continuation);
return task;
}