Fix crash in animations system when assets gets loading/unloaded while async jobs are active

#2974

Source/Engine/Content/Assets/AnimationGraphFunction.cpp

@@ -4,6 +4,7 @@
 #include "Engine/Core/Log.h"
 #include "Engine/Core/Types/DataContainer.h"
 #include "Engine/Serialization/MemoryReadStream.h"
+#include "Engine/Animations/Animations.h"
 #include "Engine/Content/Factories/BinaryAssetFactory.h"
 #include "Engine/Threading/Threading.h"
 
@@ -16,6 +17,8 @@ AnimationGraphFunction::AnimationGraphFunction(const SpawnParams& params, const
 
 Asset::LoadResult AnimationGraphFunction::load()
 {
+    ConcurrentSystemLocker::WriteScope systemScope(Animations::SystemLocker);
+
     // Get graph data from chunk
     const auto surfaceChunk = GetChunk(0);
     if (!surfaceChunk || !surfaceChunk->IsLoaded())
@@ -41,6 +44,7 @@ Asset::LoadResult AnimationGraphFunction::load()
 
 void AnimationGraphFunction::unload(bool isReloading)
 {
+    ConcurrentSystemLocker::WriteScope systemScope(Animations::SystemLocker);
     GraphData.Release();
     Inputs.Clear();
     Outputs.Clear();
@@ -65,6 +69,7 @@ BytesContainer AnimationGraphFunction::LoadSurface() const
 
 void AnimationGraphFunction::GetSignature(Array<StringView, FixedAllocation<32>>& types, Array<StringView, FixedAllocation<32>>& names)
 {
+    ScopeLock lock(Locker);
     types.Resize(32);
     names.Resize(32);
     for (int32 i = 0, j = 0; i < Inputs.Count(); i++)
@@ -96,7 +101,7 @@ bool AnimationGraphFunction::SaveSurface(const BytesContainer& data)
         LOG(Error, "Asset loading failed. Cannot save it.");
         return true;
     }
-
+    ConcurrentSystemLocker::WriteScope systemScope(Animations::SystemLocker);
     ScopeLock lock(Locker);
 
     // Set Visject Surface data
@@ -120,6 +125,7 @@ bool AnimationGraphFunction::SaveSurface(const BytesContainer& data)
 
 void AnimationGraphFunction::ProcessGraphForSignature(AnimGraphBase* graph, bool canUseOutputs)
 {
+    ScopeLock lock(Locker);
     for (int32 i = 0; i < graph->Nodes.Count(); i++)
     {
         auto& node = graph->Nodes[i];