Add error log when adding/removign actors during rendering or when ConcurrentSystemLocker deadlocks

Source/Engine/Threading/ConcurrentSystemLocker.cpp

@@ -2,6 +2,9 @@
 
 #include "ConcurrentSystemLocker.h"
 #include "Engine/Platform/Platform.h"
+#if !BUILD_RELEASE
+#include "Engine/Core/Log.h"
+#endif
 
 ConcurrentSystemLocker::ConcurrentSystemLocker()
 {
@@ -12,7 +15,25 @@ void ConcurrentSystemLocker::Begin(bool write, bool exclusively)
 {
     volatile int64* thisCounter = &_counters[write];
     volatile int64* otherCounter = &_counters[!write];
+
+#if !BUILD_RELEASE
+    int32 retries = 0;
+    double startTime = Platform::GetTimeSeconds();
+#endif
 RETRY:
+#if !BUILD_RELEASE
+    retries++;
+    if (retries > 1000)
+    {
+        double endTime = Platform::GetTimeSeconds();
+        if (endTime - startTime > 0.5f)
+        {
+            LOG(Error, "Deadlock detected in ConcurrentSystemLocker! Thread 0x{0:x} waits for {1} ms...", Platform::GetCurrentThreadID(), (int32)((endTime - startTime) * 1000.0));
+            retries = 0;
+        }
+    }
+#endif
+
     // Check if we can enter (cannot read while someone else is writing and vice versa)
     if (Platform::AtomicRead(otherCounter) != 0)
     {
@@ -47,3 +68,8 @@ void ConcurrentSystemLocker::End(bool write)
     // Mark that we left this section
     Platform::InterlockedDecrement(&_counters[write]);
 }
+
+bool ConcurrentSystemLocker::HasLock(bool write) const
+{
+    return Platform::AtomicRead(&_counters[write]) != 0;
+}