/// <summary>
/// Executes a foreach loop in which iterations may run in parallel
/// </summary>
/// <typeparam name="T">Object type that the collection wraps</typeparam>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="enumerable">An enumerable collection to iterate over</param>
/// <param name="body">Method body to run for each object in the collection</param>
public static void ForEach <T>(int threadCount, IEnumerable <T> enumerable, Action <T> body)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
IEnumerator <T> enumerator = enumerable.GetEnumerator();
Exception exception = null;
for (int i = 0; i < threadCount; i++)
{
WorkPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
T entry;
lock (enumerator)
{
if (!enumerator.MoveNext())
{
break;
}
entry = (T)enumerator.Current; // Explicit typecast for Mono's sake
}
try { body(entry); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
/// <summary>
/// Executes a for loop in which iterations may run in parallel
/// </summary>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="fromInclusive">The loop will be started at this index</param>
/// <param name="toExclusive">The loop will be terminated before this index is reached</param>
/// <param name="body">Method body to run for each iteration of the loop</param>
public static void For(int threadCount, int fromInclusive, int toExclusive, Action <int> body)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
Exception exception = null;
--fromInclusive;
for (int i = 0; i < threadCount; i++)
{
WorkPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
int currentIndex = Interlocked.Increment(ref fromInclusive);
if (currentIndex >= toExclusive)
{
break;
}
try { body(currentIndex); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
/// <summary>
/// Executes a series of tasks in parallel
/// </summary>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="actions">A series of method bodies to execute</param>
public static void Invoke(int threadCount, params Action[] actions)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
int index = -1;
Exception exception = null;
for (int i = 0; i < threadCount; i++)
{
WorkPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
int currentIndex = Interlocked.Increment(ref index);
if (currentIndex >= actions.Length)
{
break;
}
try { actions[currentIndex](); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
/// <summary>
/// Fire the events registered for this event type asynchronously
/// </summary>
/// <param name="capsEvent">Capability name</param>
/// <param name="message">Decoded event body</param>
/// <param name="simulator">Reference to the simulator that
/// generated this event</param>
internal void BeginRaiseEvent(string capsEvent, IMessage message, Simulator simulator)
{
bool specialHandler = false;
Caps.EventQueueCallback callback;
// Default handler first, if one exists
if (_EventTable.TryGetValue(String.Empty, out callback))
{
if (callback != null)
{
CapsCallbackWrapper wrapper;
wrapper.Callback = callback;
wrapper.CapsEvent = capsEvent;
wrapper.Message = message;
wrapper.Simulator = simulator;
WorkPool.QueueUserWorkItem(_ThreadPoolCallback, wrapper);
}
}
// Explicit handler next
if (_EventTable.TryGetValue(capsEvent, out callback) && callback != null)
{
CapsCallbackWrapper wrapper;
wrapper.Callback = callback;
wrapper.CapsEvent = capsEvent;
wrapper.Message = message;
wrapper.Simulator = simulator;
WorkPool.QueueUserWorkItem(_ThreadPoolCallback, wrapper);
specialHandler = true;
}
if (!specialHandler)
{
Logger.Log("Unhandled CAPS event " + capsEvent, Helpers.LogLevel.Warning, Client);
}
}
/// <summary>
/// Master Download Thread, Queues up downloads in the threadpool
/// </summary>
private void DownloadThread()
{
int slot;
while (_Running)
{
// find free slots
int pending = 0;
int active = 0;
TaskInfo nextTask = null;
lock (_Transfers)
{
foreach (KeyValuePair <UUID, TaskInfo> request in _Transfers)
{
if (request.Value.State == TextureRequestState.Pending)
{
nextTask = request.Value;
++pending;
}
else if (request.Value.State == TextureRequestState.Progress)
{
++active;
}
}
}
if (pending > 0 && active <= maxTextureRequests)
{
slot = -1;
// find available slot for reset event
lock (lockerObject)
{
for (int i = 0; i < threadpoolSlots.Length; i++)
{
if (threadpoolSlots[i] == -1)
{
// found a free slot
threadpoolSlots[i] = 1;
slot = i;
break;
}
}
}
// -1 = slot not available
if (slot != -1 && nextTask != null)
{
nextTask.State = TextureRequestState.Started;
nextTask.RequestSlot = slot;
//Logger.DebugLog(String.Format("Sending Worker thread new download request {0}", slot));
WorkPool.QueueUserWorkItem(TextureRequestDoWork, nextTask);
continue;
}
}
// Queue was empty or all download slots are inuse, let's give up some CPU time
Thread.Sleep(500);
}
Logger.Log("Texture pipeline shutting down", Helpers.LogLevel.Info);
}