UniTask/Assets/UniRx.Async/Internal/PlayerLoopRunner.cs

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2019-05-19 23:14:47 +08:00
#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
using System;
using UnityEngine;
namespace UniRx.Async.Internal
{
internal sealed class PlayerLoopRunner
{
const int InitialSize = 16;
readonly object runningAndQueueLock = new object();
readonly object arrayLock = new object();
readonly Action<Exception> unhandledExceptionCallback;
int tail = 0;
bool running = false;
IPlayerLoopItem[] loopItems = new IPlayerLoopItem[InitialSize];
MinimumQueue<IPlayerLoopItem> waitQueue = new MinimumQueue<IPlayerLoopItem>(InitialSize);
public PlayerLoopRunner()
{
this.unhandledExceptionCallback = ex => Debug.LogException(ex);
}
public void AddAction(IPlayerLoopItem item)
{
lock (runningAndQueueLock)
{
if (running)
{
waitQueue.Enqueue(item);
return;
}
}
lock (arrayLock)
{
// Ensure Capacity
if (loopItems.Length == tail)
{
Array.Resize(ref loopItems, checked(tail * 2));
}
loopItems[tail++] = item;
}
}
public void Run()
{
lock (runningAndQueueLock)
{
running = true;
}
lock (arrayLock)
{
var j = tail - 1;
// eliminate array-bound check for i
for (int i = 0; i < loopItems.Length; i++)
{
var action = loopItems[i];
if (action != null)
{
try
{
if (!action.MoveNext())
{
loopItems[i] = null;
}
else
{
continue; // next i
}
}
catch (Exception ex)
{
loopItems[i] = null;
try
{
unhandledExceptionCallback(ex);
}
catch { }
}
}
// find null, loop from tail
while (i < j)
{
var fromTail = loopItems[j];
if (fromTail != null)
{
try
{
if (!fromTail.MoveNext())
{
loopItems[j] = null;
j--;
continue; // next j
}
else
{
// swap
loopItems[i] = fromTail;
loopItems[j] = null;
j--;
goto NEXT_LOOP; // next i
}
}
catch (Exception ex)
{
loopItems[j] = null;
j--;
try
{
unhandledExceptionCallback(ex);
}
catch { }
continue; // next j
}
}
else
{
j--;
}
}
tail = i; // loop end
break; // LOOP END
NEXT_LOOP:
continue;
}
lock (runningAndQueueLock)
{
running = false;
while (waitQueue.Count != 0)
{
if (loopItems.Length == tail)
{
Array.Resize(ref loopItems, checked(tail * 2));
}
loopItems[tail++] = waitQueue.Dequeue();
}
}
}
}
}
}
#endif