Add minetest.get_mapgen_object to API

src/jthread/jthread.h

@@ -47,6 +47,7 @@ public:
 	virtual void *Thread() = 0;
 	bool IsRunning();
 	void *GetReturnValue();
+	bool IsSameThread();
 protected:
 	void ThreadStarted();
 private:

src/jthread/pthread/jthread.cpp

@@ -148,6 +148,11 @@ void *JThread::GetReturnValue()
 	return val;
 }
 
+bool JThread::IsSameThread()
+{
+	return pthread_equal(pthread_self(), threadid);
+}
+
 void *JThread::TheThread(void *param)
 {
 	JThread *jthread;

src/jthread/win32/jthread.cpp

@@ -141,6 +141,11 @@ void *JThread::GetReturnValue()
 	return val;
 }
 
+bool JThread::IsSameThread()
+{
+	return GetCurrentThreadId() == threadid;
+}
+
 #ifndef _WIN32_WCE
 UINT __stdcall JThread::TheThread(void *param)
 #else