Fix bug with ~Event() calling a virtual method

This solves a crash when an exception is thrown
on the main thread (in test() for example, when
setting json storage to xz but without liblzma
support enabled).
Thi also makes the program quit gracefully when
SIGINT is received.
It seems to also fix the problem with exceptions
thrown in worker threads.

src/eventia/event.cpp

@@ -19,6 +19,13 @@
 #include "eventia.hpp"
 #include "private/context.hpp"
 #include <cassert>
+#if !defined(NDEBUG)
+#	ifdef __GNUG__
+#		include <cstdlib>
+#		include <memory>
+#		include <cxxabi.h>
+#	endif
+#endif
 
 namespace eve {
 
@@ -32,18 +39,36 @@ Event::Event (const Context& ctx) :
 
 Event::~Event() noexcept {
 	m_eventia->unregister_stop_callback(m_cb_id);
-	on_loop_stopping_local();
 }
 
 void Event::on_loop_stopping_local() noexcept {
-	if (not m_was_stopped) {
-		m_was_stopped = true;
 	this->on_loop_stopping();
-	}
 }
 
 void Event::set_exception (std::exception_ptr ptr) {
 	m_eventia->set_exception(ptr);
 }
 
+#if !defined(NDEBUG)
+std::string Event::demangle (const char* name) {
+	//see:
+	//https://stackoverflow.com/questions/281818/unmangling-the-result-of-stdtype-infoname
+
+#ifdef __GNUG__
+	int status = -4; // some arbitrary value to eliminate the compiler warning
+
+	// enable c++11 by passing the flag -std=c++11 to g++
+	std::unique_ptr<char, void(*)(void*)> res {
+		abi::__cxa_demangle(name, NULL, NULL, &status),
+		std::free
+	};
+
+	return (status==0) ? res.get() : name ;
+#else
+	// does nothing if not g++
+    return name;
+#endif
+}
+#endif
+
 } //namespace eve

src/eventia/event.hpp

@@ -18,6 +18,10 @@
 #pragma once
 
 #include <exception>
+#if !defined(NDEBUG)
+#	include <iostream>
+#	include <typeinfo>
+#endif
 
 namespace eve {
 
@@ -32,12 +36,34 @@ protected:
 	virtual void on_loop_stopping() noexcept = 0;
 	void set_exception (std::exception_ptr ptr);
 
+	template <typename EV> void stop_ifn(EV& eve);
+
 private:
 	void on_loop_stopping_local() noexcept;
+#if !defined(NDEBUG)
+	static std::string demangle(const char* name);
+#endif
 
 	unsigned int m_cb_id;
 	Eventia* m_eventia;
 	bool m_was_stopped;
 };
 
+template <typename EV>
+inline void Event::stop_ifn (EV& eve) {
+#if !defined(NDEBUG)
+	const bool was_stopped = m_was_stopped;
+#endif
+
+	if (not m_was_stopped) {
+		m_was_stopped = true;
+		eve.stop();
+	}
+
+#if !defined(NDEBUG)
+	std::cout << "Event stopped: " << demangle(typeid(EV).name()) <<
+		" (was already stopped: " << std::boolalpha << was_stopped << ")\n";
+#endif
+}
+
 } //namespace eve

src/eventia/eventia.cpp

@@ -76,6 +76,7 @@ Eventia::Eventia() :
 
 Eventia::~Eventia() noexcept {
 	try {
+		this->stop();
 		this->wait();
 	}
 	catch (std::runtime_error& err) {
@@ -104,9 +105,14 @@ void Eventia::do_nothing() {
 }
 
 void Eventia::stop() {
+#if !defined(NDEBUG)
+	std::cout << "Stopping Eventia (" << m_local->stop_cbs.size() << " observers)...\n";
+#endif
 	for (auto& stop_cb : m_local->stop_cbs) {
 		stop_cb.second();
 	}
+	m_local->async.send();
+	m_local->async.stop();
 	m_local->loop.break_loop(ev::ALL);
 }
 

src/eventia/signal.cpp

@@ -59,17 +59,16 @@ Signal::Signal (int sig, const Context& ctx) :
 	}
 }
 
-Signal::~Signal() noexcept = default;
+Signal::~Signal() noexcept {
+	Signal::on_loop_stopping();
+}
 
 void Signal::on_signal_ev() {
 	this->on_signal();
 }
 
 void Signal::on_loop_stopping() noexcept {
-#if !defined(NDEBUG)
+	stop_ifn(m_local->signal);
-	std::cout << "Signal::on_loop_stopping()\n";
-#endif
-	m_local->signal.stop();
 }
 
 } //namespace eve

src/eventia/timer.cpp

@@ -60,7 +60,9 @@ Timer::Timer (double delay, const Context& ctx) :
 	this->set_timer(delay);
 }
 
-Timer::~Timer() noexcept = default;
+Timer::~Timer() noexcept {
+	Timer::on_loop_stopping();
+}
 
 void Timer::on_timer_ev() {
 	double& elapsed = m_local->elapsed;
@@ -92,10 +94,7 @@ void Timer::set_timer (double delay) {
 }
 
 void Timer::on_loop_stopping() noexcept {
-#if !defined(NDEBUG)
+	this->stop_ifn(m_local->timer);
-	std::cout << "Timer::on_loop_stopping()\n";
-#endif
-	m_local->timer.stop();
 }
 
 } //namespace eve