On Windows, warn if a thread was terminated with its QThread still in running state.

I hope this catches if the data cache serializer is killed in the middle of a save.

src/blackmisc/worker.cpp

@@ -12,8 +12,46 @@
 
 #include <future>
 
+#ifdef Q_OS_WIN32
+#include <windows.h>
+#endif
+
 namespace BlackMisc
 {
+    void CRegularThread::run()
+    {
+#ifdef Q_OS_WIN32
+        m_handle = GetCurrentThread();
+        QThread::run();
+        m_handle = nullptr;
+#else
+        QThread::run();
+#endif
+    }
+
+    CRegularThread::~CRegularThread()
+    {
+#ifdef Q_OS_WIN32
+        auto handle = m_handle.load();
+        if (handle)
+        {
+            auto status = WaitForSingleObject(handle, 0);
+            if (isRunning())
+            {
+                switch (status)
+                {
+                default:
+                case WAIT_FAILED: qWarning() << "Thread" << objectName() << "unspecified error"; break;
+                case WAIT_OBJECT_0: qWarning() << "Thread" << objectName() << "unsafely terminated by program shutdown"; break;
+                case WAIT_TIMEOUT: break;
+                }
+            }
+        }
+#endif
+        quit();
+        wait();
+    }
+
     CWorker *CWorker::fromTaskImpl(QObject *owner, const QString &name, int typeId, std::function<CVariant()> task)
     {
         auto *thread = new CRegularThread(owner);

src/blackmisc/worker.h

@@ -32,6 +32,7 @@
 #include <algorithm>
 #include <functional>
 #include <type_traits>
+#include <atomic>
 
 namespace BlackMisc
 {
@@ -96,11 +97,14 @@ namespace BlackMisc
         CRegularThread(QObject *parent = nullptr) : QThread(parent) {}
 
         //! Destructor
-        ~CRegularThread()
-        {
-            quit();
-            wait();
-        }
+        ~CRegularThread();
+
+    protected:
+        //! \copydoc QThread::run
+        virtual void run() override;
+
+    private:
+        std::atomic<void *> m_handle { nullptr };
     };
 
     /*!