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Webgl平台GC报错ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds
猜测原因： webgl平台对线程支持不完善，具体的报错我贴到最后。 我的解决方案： 用LockFreeQueue<GCAction> refQueue 替换 Queue<GCAction>refQueue 以下是LockFreeQueue的代码，供参考：
public class LockFreeQueue<T> { internal class SingleLinkNode<U> where U : T { public SingleLinkNode<U> Next; public U Item; } static private bool CAS<V>(ref V location, V comparand, V newValue) where V : class { return comparand == Interlocked.CompareExchange<V>(ref location, newValue, comparand); }
SingleLinkNode<T> head;
SingleLinkNode<T> tail;
int count;
public int Count { get { return count; } }
public bool IsEmpty { get { return count <= 0; } }
public LockFreeQueue()
{
head = new SingleLinkNode<T>();
tail = head;
count = 0;
}
public void Enqueue(T item)
{
SingleLinkNode<T> oldTail = null;
SingleLinkNode<T> oldTailNext;
SingleLinkNode<T> newNode = new SingleLinkNode<T>();
newNode.Item = item;
bool newNodeAdded = false;
while (!newNodeAdded)
{
oldTail = tail;
oldTailNext = oldTail.Next;
if (tail == oldTail)
{
if (oldTailNext == null)
newNodeAdded = CAS<SingleLinkNode<T>>(ref tail.Next, null, newNode);
else
CAS<SingleLinkNode<T>>(ref tail, oldTail, oldTailNext);
}
}
CAS<SingleLinkNode<T>>(ref tail, oldTail, newNode);
Interlocked.Increment(ref count);
}
public bool TryDequeue(out T item)
{
item = default(T);
SingleLinkNode<T> oldHead = null;
bool haveAdvancedHead = false;
while (!haveAdvancedHead)
{
oldHead = head;
SingleLinkNode<T> oldTail = tail;
SingleLinkNode<T> oldHeadNext = oldHead.Next;
if (oldHead == head)
{
if (oldHead == oldTail)
{
if (oldHeadNext == null)
{
return false;
}
CAS<SingleLinkNode<T>>(ref tail, oldTail, oldHeadNext);
}
else
{
item = oldHeadNext.Item;
haveAdvancedHead = CAS<SingleLinkNode<T>>(ref head, oldHead, oldHeadNext);
}
}
}
Interlocked.Decrement(ref count);
return true;
}
public T Dequeue()
{
T result;
if (TryDequeue(out result)) return result;
return default(T);
}
public void Clear()
{
while (Count > 0)
{
Dequeue();
}
}
}
浏览器报错信息如下：
ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds at System.Array.Copy (System.Array sourceArray, System.Int32 sourceIndex, System.Array destinationArray, System.Int32 destinationIndex, System.Int32 length) [0x00000] in <00000000000000000000000000000000>:0
(Filename: currently not available on il2cpp Line: -1)
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WebAssembly.instantiate:21431259 _luaD_precall blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21108589 _luaV_execute blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21120800 __ZL6f_callP9lua_StatePv blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21170722 dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21636298 dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28135 invoke_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:18854 _luaD_pcall blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21150513 _lua_pcall blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21405567 _Lua_lua_pcall_m97E7901117F39F04F75968DD7108B9550C46FE3D blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:15322452 _DelegateBridge_PCall_mA03E26CAF1228ACA1091839DDB065D9E28C7D3D5 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21074813 dynCall_viiiiii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21637875 dynCall_viiiiii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28395 invoke_viiiiii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:19374 _DelegateBridge___Gen_Delegate_Imp9_m759BEA6495C6F009E332C1AD0D859559BFA88313 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21078901 _DeserializationEventHandler_Invoke_mE08F6E81D9791C6A69EA7BFCF50FA33B237B35D3 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:13469886 dynCall_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21636861 dynCall_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28235 invoke_viii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:19054 _LuaWebsock_U3C_ctorU3Eb__12_0_m13E0E8609C65069BA2CCA6A2C664E556D08E240A blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:20934740 _ThreadStart_Invoke_m11B6A66E82F02C74399A7314C14C7F52393CC4B4 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:13796822 _WebSocket_DelegateOnOpenEvent_m9C6342AA07D1461D403BA1C32538B1062B945962 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:17189401 _WebSocketFactory_DelegateOnOpenEvent_mB0CF6AB6CC5075461678E3A62D23A2E55EA2D5A6 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:17190262 dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21636298 dynCall_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:28135 invoke_vii blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:18854 _ReversePInvokeWrapper_WebSocketFactory_DelegateOnOpenEvent_mB0CF6AB6CC5075461678E3A62D23A2E55EA2D5A6 blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:17190075 dynCall_vi blob:null/c587e4f0-fc76-436f-ab17-553632bb414b line 1394 > WebAssembly.instantiate:21635446 dynCall_vi blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:27985 dynCall blob:null/c587e4f0-fc76-436f-ab17-553632bb414b:579 onopen
补充： 修改的代码在LuaEnv.cs中，如下： public void Tick() { #if THREAD_SAFE || HOTFIX_ENABLE lock (luaEnvLock) { #endif var _L = L; //lock (refQueue) //{ while (refQueue.Count > 0) { GCAction gca = refQueue.Dequeue(); translator.ReleaseLuaBase(_L, gca.Reference, gca.IsDelegate); } //} #if !XLUA_GENERAL last_check_point = translator.objects.Check(last_check_point, max_check_per_tick, object_valid_checker, translator.reverseMap); #endif #if THREAD_SAFE || HOTFIX_ENABLE } #endif } LockFreeQueue<GCAction> refQueue = new LockFreeQueue<GCAction>(); internal void equeueGCAction(GCAction action) { refQueue.Enqueue(action); // lock (refQueue) // { // refQueue.Enqueue(action); // } }
lua是c写的，c支持的平台就支持。 luajit部分代码是用汇编写的，luajit写了哪个平台的就支持哪个平台。所以这个问题问luajit作者比较合适。
@cyinwind 大佬，我把你的LockFreeQueue代码拉取下来，但是报错了，请问我可以参考一下你的代码吗
解决了，我把代码改成下面的样子就没有问题了
using System.Threading;
namespace XLua
{
public class LockFreeQueue<T>
{
internal class SingleLinkNode<U> where U : T
{
public SingleLinkNode<U> Next;
public U Item;
}
static private bool CAS<T>(ref T location, T comparand, T newValue) where T : class
{
return comparand == Interlocked.CompareExchange(ref location, newValue, comparand);
}
SingleLinkNode<T> head;
SingleLinkNode<T> tail;
int count;
public int Count
{
get { return count; }
}
public bool IsEmpty
{
get { return count <= 0; }
}
public LockFreeQueue()
{
head = new SingleLinkNode<T>();
tail = head;
count = 0;
}
public void Enqueue(T item)
{
SingleLinkNode<T> oldTail = null;
SingleLinkNode<T> oldTailNext;
SingleLinkNode<T> newNode = new SingleLinkNode<T>();
newNode.Item = item;
bool newNodeAdded = false;
while (!newNodeAdded)
{
oldTail = tail;
oldTailNext = oldTail.Next;
if (tail == oldTail)
{
if (oldTailNext == null)
newNodeAdded = CAS<SingleLinkNode<T>>(ref tail.Next, null, newNode);
else
CAS<SingleLinkNode<T>>(ref tail, oldTail, oldTailNext);
}
}
CAS<SingleLinkNode<T>>(ref tail, oldTail, newNode);
Interlocked.Increment(ref count);
}
public bool TryDequeue(out T item)
{
item = default(T);
SingleLinkNode<T> oldHead = null;
bool haveAdvancedHead = false;
while (!haveAdvancedHead)
{
oldHead = head;
SingleLinkNode<T> oldTail = tail;
SingleLinkNode<T> oldHeadNext = oldHead.Next;
if (oldHead == head)
{
if (oldHead == oldTail)
{
if (oldHeadNext == null)
{
return false;
}
CAS<SingleLinkNode<T>>(ref tail, oldTail, oldHeadNext);
}
else
{
item = oldHeadNext.Item;
haveAdvancedHead = CAS<SingleLinkNode<T>>(ref head, oldHead, oldHeadNext);
}
}
}
Interlocked.Decrement(ref count);
return true;
}
public T Dequeue()
{
T result;
if (TryDequeue(out result)) return result;
return default(T);
}
public void Clear()
{
while (Count > 0)
{
Dequeue();
}
}
}
}
浏览器执行都是单线程。感觉直接加个条件编译宏，如果是WEBGL就别lock就可以了
@chexiongsheng 测试了下，不一定对。这个 issue 和多线程无关。主要是因为 GC 时调用了 Dispose，它会调用 refQueue.Enqueue，而这可能会导致 refQueue 扩容。为了满足扩容的内存需求，refQueue.Enqueue 可能会再次引起 GC，导致调用第二个 LuaBase 的 Dispose，它又再次调用 refQueue.Enqueue。也就是说 refQueue.Enqueue 可能导致 Queue.SetCapacity 的重入 （表现上像是多线程并发），因而 Destination array was not long enough。
至于重入，可能是因为 lock (refQueue) 的锁 Monitor 是个递归锁，同个线程可以重入，而不会死锁。参考 MSDN 文档
It is legal for the same thread to invoke Enter more than once without it blocking; however, an equal number of Exit calls must be invoked before other threads waiting on the object will unblock.
一种解决方案是上面大佬发的使用 CAS 实现 LockFreeQueue。
（如果有使用 tolua 的童鞋找到这个 issue）tolua 同样存在这个问题，但 tolua 是 gcList，在 tolua 要实现 LockFreeList 会相对麻烦些，因为还要支持在任意节点 RemoveAt() 的需求。如果只想简单的 fix，可以在 gcList 初始化时分配足够的 capacity，如 List<GCRef> gcList = new List<GCRef>(4096);，其中的 4096 是拍脑袋的，原则是 gcList 不扩容即可。
xLua 这个 issue 可能也可以这样绕过。
微信小游戏 webgl 也遇到类似 array.copy爆了， websocket调用过来，异步，也GC炸锅了，XLua原版，啥都没改也有问题，不是只有主线程吗，不懂，求大神指导
浏览器执行都是单线程。感觉直接加个条件编译宏，如果是WEBGL就别lock就可以了
@chexiongsheng 测试了下，不一定对。这个 issue 和多线程无关。主要是因为 GC 时调用了
Dispose，它会调用refQueue.Enqueue，而这可能会导致refQueue扩容。为了满足扩容的内存需求，refQueue.Enqueue可能会再次引起 GC，导致调用第二个LuaBase的Dispose，它又再次调用refQueue.Enqueue。也就是说refQueue.Enqueue可能导致Queue.SetCapacity的重入 （表现上像是多线程并发），因而Destination array was not long enough。至于重入，可能是因为
lock (refQueue)的锁 Monitor 是个递归锁，同个线程可以重入，而不会死锁。参考 MSDN 文档It is legal for the same thread to invoke Enter more than once without it blocking; however, an equal number of Exit calls must be invoked before other threads waiting on the object will unblock.
一种解决方案是上面大佬发的使用 CAS 实现
LockFreeQueue。（如果有使用 tolua 的童鞋找到这个 issue）tolua 同样存在这个问题，但 tolua 是 gcList，在 tolua 要实现
LockFreeList会相对麻烦些，因为还要支持在任意节点RemoveAt()的需求。如果只想简单的 fix，可以在 gcList 初始化时分配足够的 capacity，如List<GCRef> gcList = new List<GCRef>(4096);，其中的 4096 是拍脑袋的，原则是 gcList 不扩容即可。xLua 这个 issue 可能也可以这样绕过。
像webgl微信小游戏同一个主线程，不是有顺序的吗，重入，也不应该会导致这个问题出现，虽然现实中确实坑爹的出现了这个问题，无解~