public static async Task Worker(FunctionToGetWorkItem getWorkItem, Action <Exception> callOnException, int maxParallel)
{
Task[] tasksInProgress = new Task[maxParallel];
int numTasksInProgress = 0;
while (true)
{
Task newTask;
if (!getWorkItem(out newTask))
{
// There are no more tasks to perform. Wait until the last one is completed.
if (numTasksInProgress > 0)
{
await Task.WhenAll(tasksInProgress.Take(numTasksInProgress));
}
return;
}
if (newTask.IsCompleted || newTask.IsCanceled)
{
continue;
}
if (newTask.IsFaulted)
{
callOnException(newTask.Exception);
continue;
}
// The task could not complete immediately, is still in progress, and needs to be awaited...
if (numTasksInProgress > 0)
{
RemoveCompletedTasks(tasksInProgress, ref numTasksInProgress, callOnException);
if (numTasksInProgress >= tasksInProgress.Length)
{
await Task.WhenAny(tasksInProgress);
RemoveCompletedTasks(tasksInProgress, ref numTasksInProgress, callOnException);
}
}
// Now add the new task
tasksInProgress[numTasksInProgress++] = newTask;
}
}
public static async Task Worker(FunctionToGetWorkItem getWorkItem, Action <Exception> callOnException, int maxParallel)
{
Task[] tasksInProgress = new Task[maxParallel];
int numTasksInProgress = 0;
while (true)
{
Task newTask;
if (!getWorkItem(out newTask))
{
if (numTasksInProgress > 0)
{
await Task.WhenAll(tasksInProgress.Take(numTasksInProgress));
}
return;
}
if (newTask.IsCompleted || newTask.IsCanceled)
{
continue;
}
if (newTask.IsFaulted)
{
callOnException(newTask.Exception);
continue;
}
if (numTasksInProgress > 0)
{
RemoveCompletedTasks(tasksInProgress, ref numTasksInProgress, callOnException);
if (numTasksInProgress >= tasksInProgress.Length)
{
await Task.WhenAny(tasksInProgress);
RemoveCompletedTasks(tasksInProgress, ref numTasksInProgress, callOnException);
}
}
tasksInProgress[numTasksInProgress++] = newTask;
}
}
