How to release a session?

[rscguo]

I can't release the session....

Ort::Env* env = new Ort::Env(ORT_LOGGING_LEVEL_ERROR, "ort");
Ort::Session* module(nullptr);

int load_model() {
	Ort::SessionOptions session_options;
	session_options.SetIntraOpNumThreads(1);
	module = new Ort::Session(*env,"xxx.onnx", session_options);
}

int free_model() {
    module->GetModelMetadata().release();
    module->release();
    module = NULL;
    delete module;
}

void signal_handler(int sig) {
    std::cout << "Interrupt signal (" << sig << ") received." << std::endl;
    exit(sig);  
}

void wait_loop() {
    signal(SIGINT, signal_handler);  
    while (true) {
        std::cin.get();
        load_model();
        free_model();
    }
}

int main(int argc, const char* argv[]) {
	wait_loop();
}