- bugfix for unit selection segfault on game exit

- added thread hardening to try to ensure we never try to delete a thread more than once.

source/shared_lib/include/platform/common/base_thread.h

@@ -15,6 +15,7 @@
 #include "leak_dumper.h"
 #include "thread.h"
 #include <string>
+#include <map>
 
 using namespace Shared::Platform;
 using namespace std;
@@ -41,6 +42,10 @@ protected:
 	Mutex mutexExecutingTask;
 	bool executingTask;
 
+	void *ptr;
+	static Mutex mutexMasterThreadList;
+	static std::map<void *,int> masterThreadList;
+
 	bool quit;
 	bool running;
 	string uniqueID;
@@ -90,6 +95,8 @@ public:
     T * getGenericData() { return genericData; }
     template <typename T>
     void setGenericData(T *value) { genericData = value; }
+
+    static bool isThreadDeleted(void *ptr);
 };
 
 class RunningStatusSafeWrapper {