# Called immediatly on receiving an unsafe signal (should be redefed by subclasses)
	#
	# Should be used for `sigkill` and `sigstop` since they cannot be caught,
	# blocked or ignored.
	#
	# You should consider this methods as being fragile. It should be implemented in C
	# and you should not do too much callbacks to Nit.
	#
	#     class MyReceiver
	#         super SignalHandler
	#
	#         redef fun receive_signal_unsafe(signal) do print "received unsafely {signal}"
	#     end
	#
	#     var r = new MyReceiver
	#     r.handle_signal(sigsegv, false) # `r.receive_signal_unsafe` will be invoked on sigsegv
	fun receive_signal_unsafe(signal: Int) do end