force an interrupt when no cycles were seen

kw11-l.cpp

@@ -62,13 +62,22 @@ void kw11_l::reset()
 	lf_csr = 0;
 }
 
+void kw11_l::do_interrupt()
+{
+	set_lf_crs_b7();
+
+	if (get_lf_crs() & 64)
+		b->getCpu()->queue_interrupt(6, 0100);
+}
+
 void kw11_l::operator()()
 {
 	set_thread_name("kek:kw-11l");
 
 	TRACE("Starting KW11-L thread");
 
-	uint64_t prev_cycle_count = b->getCpu()->get_instructions_executed_count();
+	uint64_t prev_cycle_count          = b->getCpu()->get_instructions_executed_count();
+	uint64_t interval_prev_cycle_count = prev_cycle_count;
 
 	while(!stop_flag) {
 		if (*cnsl->get_running_flag()) {
@@ -77,14 +86,13 @@ void kw11_l::operator()()
 			uint64_t current_cycle_count = b->getCpu()->get_instructions_executed_count();
 			uint32_t took_ms = b->getCpu()->get_effective_run_time(current_cycle_count - prev_cycle_count);
 
-			if (took_ms >= 1000 / 50) {
-				set_lf_crs_b7();
-
-				if (get_lf_crs() & 64)
-					b->getCpu()->queue_interrupt(6, 0100);
+			if (took_ms >= 1000 / 50 || current_cycle_count - interval_prev_cycle_count == 0) {
+				do_interrupt();
 
 				prev_cycle_count = current_cycle_count;
 			}
+
+			interval_prev_cycle_count = current_cycle_count;
 		}
 		else {
 			myusleep(1000000 / 10);  // 10 Hz

kw11-l.h

@@ -28,6 +28,8 @@ class kw11_l
 	uint8_t  get_lf_crs();
 	void     set_lf_crs_b7();
 
+	void     do_interrupt();
+
 public:
 	kw11_l(bus *const b);
 	virtual ~kw11_l();