qt: switch to polling for status bar updating

src/include/86box/machine_status.h

@@ -0,0 +1,32 @@
+#ifndef EMU_MACHINE_STATUS_H
+#define EMU_MACHINE_STATUS_H
+
+typedef struct {
+    atomic_bool_t empty;
+    atomic_bool_t active;
+} dev_status_empty_active_t;
+
+typedef struct {
+    atomic_bool_t active;
+} dev_status_active_t;
+
+typedef struct {
+    atomic_bool_t empty;
+} dev_status_empty_t;
+
+typedef struct {
+    dev_status_empty_active_t fdd[FDD_NUM];
+    dev_status_empty_active_t cdrom[CDROM_NUM];
+    dev_status_empty_active_t zip[ZIP_NUM];
+    dev_status_empty_active_t mo[MO_NUM];
+    dev_status_empty_active_t cassette;
+    dev_status_active_t hdd[HDD_BUS_USB];
+    dev_status_active_t net;
+    dev_status_empty_t cartridge[2];
+} machine_status_t;
+
+extern machine_status_t machine_status;
+
+extern void machine_status_init();
+
+#endif /*EMU_MACHINE_STATUS_H*/