Merge pull request #12791 from alalek:win32_dllmain_detect_termination

modules/core/src/ocl.cpp

@@ -4779,6 +4779,10 @@ public:
 
     void deallocate_(UMatData* u) const
     {
+#ifdef _WIN32
+        if (cv::__termination)  // process is not in consistent state (after ExitProcess call) and terminating
+            return;             // avoid any OpenCL calls
+#endif
         if(u->tempUMat())
         {
             CV_Assert(u->origdata);

modules/core/src/precomp.hpp

@@ -308,8 +308,9 @@ TLSData<CoreTLSData>& getCoreTlsData();
 #define CL_RUNTIME_EXPORT
 #endif
 
-extern bool __termination; // skip some cleanups, because process is terminating
-                           // (for example, if ExitProcess() was already called)
+extern CV_EXPORTS
+bool __termination;  // skip some cleanups, because process is terminating
+                     // (for example, if ExitProcess() was already called)
 
 cv::Mutex& getInitializationMutex();