[*] Harden 1920f5a8 against deadlocks under neverending pipe conditions

Include/Aurora/IO/CompletionGroup/ICompletionGroupWorkItem.hpp

@@ -13,5 +13,9 @@ namespace Aurora::IO::CompletionGroup
     {
         virtual bool HasCompletedForGCWI() = 0;
         virtual void CleanupForGCWI() = 0;
+        inline virtual bool HasNonTrivialCleanup()
+        {
+            return false;
+        }
     };
 }

Source/IO/Async/AuIOAPCLessWaitable.cpp

@@ -47,12 +47,17 @@ namespace Aurora::IO::Async
     
     bool APCLessWaitable::HasCompletedForGCWI()
     {
-        this->CheckLocal();
         return this->bHasFinished;
     }
 
+    bool APCLessWaitable::HasNonTrivialCleanup()
+    {
+        return true;
+    }
+
     void APCLessWaitable::CleanupForGCWI()
     {
+        this->CheckLocal();
         AuResetMember(this->pCompletionGroup);
     }
 

Source/IO/Async/AuIOAPCLessWaitable.hpp

@@ -39,6 +39,7 @@ namespace Aurora::IO::Async
 
         virtual bool HasCompletedForGCWI() override;
         virtual void CleanupForGCWI() override;
+        virtual bool HasNonTrivialCleanup() override;
 
         bool HasBeenSignaled();
 

Source/IO/CompletionGroup/CompletionGroup.cpp

@@ -65,7 +65,7 @@ namespace Aurora::IO::CompletionGroup
 
     void CompletionGroup::DoIOTick(bool bManual)
     {
-        AuList<AuSPtr<ICompletionGroupWorkItem>> removedItems;
+        AuList<AuPair<AuSPtr<ICompletionGroupWorkItem>, bool>> removedItems;
 
         {
             AU_DEBUG_MEMCRUNCH;
@@ -82,11 +82,19 @@ namespace Aurora::IO::CompletionGroup
 
                     this->uTriggered++;
 
-                    that->CleanupForGCWI();
 
-                    if (this->pCallbacks)
+                    if (that->HasNonTrivialCleanup())
                     {
-                        removedItems.push_back(that);
+                        removedItems.push_back(AuMakePair(that, true));
+                    }
+                    else if (this->pCallbacks)
+                    {
+                        removedItems.push_back(AuMakePair(that, false));
+                        that->CleanupForGCWI();
+                    }
+                    else
+                    {
+                        that->CleanupForGCWI();
                     }
                 }
                 else
@@ -95,10 +103,10 @@ namespace Aurora::IO::CompletionGroup
                 }
             }
         }
-
+     
-        if (auto pCallbacks = this->pCallbacks)
+        for (const auto &[pRemoved, bNonTrivial] : removedItems)
         {
-            for (const auto &pRemoved : removedItems)
+            if (auto pCallbacks = this->pCallbacks)
             {
                 try
                 {
@@ -109,6 +117,11 @@ namespace Aurora::IO::CompletionGroup
                     SysPushErrorCatch();
                 }
             }
+
+            if (bNonTrivial)
+            {
+                pRemoved->CleanupForGCWI();
+            }
         }
 
         {