Preventing thread from calling std::terminate() on detach after handled exception

问题

I have my own thread class that is intended to help safely manage exceptions. It looks like this: (skipped other constructors and mutexes for simplicity)

class ExceptThread
    : public std::thread {
public:
    template<typename Func, typename... Args>
    ExceptThread(Func&& f, Args&&... args)
        : std::thread([] (Args&&... args) {
        try {
            return f(args...);
        } catch(...) {
            exc = std::current_exception();
        }
    }, args...) { }
    // skipped other constructors etc.
    //...    
    void check() { 
        if(exc) { 
            std::exception_ptr tmp = exc; 
            exc = nullptr; 
            std::rethrow_exception(tmp); 
        } 
    }

private:
    std::exception_ptr exc;
};

This class means to be used like:

ExceptThread et([] { std::this_thread::sleep_for(5s); throw std::runtime_error("Ugly exception"); });

try {
    while(/*...*/) {
        // main loop
        et.check();
    }
} catch(std::exception& e) {
    // do sth
}

Problem:

When thread throws exception it gets catched in catch(...) and saved to exc, everything is fine. But when execution goes further std::terminate is called just like exception wasn't caught. I also tried to pause the child thread (e.g Sleep(INFINITE)) after catching an exception but std::terminate() gets called while detaching the thread in std::thread::~thread() during stack unwinding in main thread. How can I prevent system of doing this?

Platform: MSVC

Similar: How can I propagate exceptions between threads?

回答1:

You have to explicitly join a thread before destructing it, this is to help to prevent potential deadlocks/crashes when you forget to interrupt a thread before destroying it (in every implementation I've used this is stated in the std::terminate message).

来源：https://stackoverflow.com/questions/49119062/preventing-thread-from-calling-stdterminate-on-detach-after-handled-exceptio