//export createCallback
func createCallback(pid *C.pthread_t) {
	//runtime.LockOSThread()
	//defer runtime.UnlockOSThread()

	_gstate := C.start_thread()
	defer C.end_thread(_gstate)

	_func, _ok := callbacks.Get(pid)
	defer callbacks.Delete(pid)

	if !_ok {
		panic(fmt.Errorf("failed to found thread callback for `%v`", pid))
	}

	_func()
}
//export createThreadCallback
func createThreadCallback(pid *C.pthread_t) {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	_gstate := C.start_thread()

	_cb, _r, _w, _ok := callbacks.Get(pid)
	defer callbacks.Delete(pid)

	if !_ok {
		panic(fmt.Errorf("failed to found thread callback for `%v`", pid))
	}

	// TODO: add special headers for WSGI.
	_environ := GenerateEnviron(_r)

	_response := C.run_wsgi_application(_environ)

	// parse header
	for i := 0; i < int(C.PyList_Size(_response.headers)); i++ {
		_h := C.PyList_GetItem(_response.headers, C.Py_ssize_t(i))
		_k := C.PyTuple_GetItem(_h, C.Py_ssize_t(0))
		_v := C.PyTuple_GetItem(_h, C.Py_ssize_t(1))
		_w.Header().Set(
			PyString_AsString(_k),
			PyString_AsString(_v),
		)
	}

	_body := C.GoString(_response.body)

	if len(_body) < 1 {
		panic(fmt.Errorf("failed to import python wsgi module."))
	}
	C.end_thread(_gstate)

	// write body
	_w.WriteHeader(int(_response.status))
	_w.Write([]byte(_body))

	_cb()
}