Refactor classic interface to run within its own thread

* previously this classic interface acted as an oldschool modal dialog (which worked fine with the X11 renderer
      where we actively pumped the event loop)

src/interface.c

@@ -16,6 +16,8 @@
 
 #include "common.h"
 
+bool in_interface = false;
+
 static struct stat statbuf;
 static int altdrive;
 
@@ -1539,3 +1541,74 @@ void c_interface_keyboard_layout()
     c_interface_exit(ch);
 }
 
+/* -------------------------------------------------------------------------
+    c_interface_begin()
+   ------------------------------------------------------------------------- */
+
+static void *interface_thread(void *current_key)
+{
+    pthread_mutex_lock(&interface_mutex);
+#ifdef AUDIO_ENABLED
+    SoundSystemPause();
+#endif
+    in_interface = true;
+
+    switch ((int)current_key) {
+#ifdef INTERFACE_CLASSIC
+    case kF1:
+        c_interface_select_diskette( 0 );
+        break;
+
+    case kF2:
+        c_interface_select_diskette( 1 );
+        break;
+#endif
+
+    case kPAUSE:
+        while (c_mygetch(1) == -1)
+        {
+            struct timespec ts = { .tv_sec=0, .tv_nsec=1 };
+            nanosleep(&ts, NULL);
+        }
+        break;
+
+#ifdef INTERFACE_CLASSIC
+    case kF5:
+        c_interface_keyboard_layout();
+        break;
+
+#ifdef DEBUGGER
+    case kF7:
+        c_interface_debugging();
+        break;
+#endif
+
+    case kF8:
+        c_interface_credits();
+        break;
+
+    case kF10:
+        c_interface_parameters();
+        break;
+#endif
+
+    default:
+        break;
+    }
+
+#ifdef AUDIO_ENABLED
+    SoundSystemUnpause();
+#endif
+    c_joystick_reset();
+    pthread_mutex_unlock(&interface_mutex);
+    in_interface = false;
+
+    return NULL;
+}
+
+void c_interface_begin(int current_key)
+{
+    pthread_t t = 0;
+    pthread_create(&t, NULL, (void *) &interface_thread, (void *)current_key);
+}
+

src/interface.h

@@ -21,6 +21,9 @@
 
 #define MOUSETEXT_BEGIN 0x90
 
+extern bool in_interface;
+
+void c_interface_begin(int current_key);
 void c_interface_print(int x, int y, const int cs, const char *s);
 void c_interface_print_submenu_centered(char *submenu, const int xlen, const int ylen);
 void c_load_interface_font();

src/keys.c

@@ -33,7 +33,6 @@ extern int raw_js_y;
 static int next_key = -1;
 static int last_scancode = -1;
 bool caps_lock = false;              /* is enabled */
-static bool in_interface = false;
 
 /* ----------------------------------------------------
     //e Keymap. Mapping scancodes to Apple //e US Keyboard
@@ -234,8 +233,11 @@ void c_keys_handle_input(int scancode, int pressed)
 
     // key input consumption
 
-    if ((next_key >= 0) && !in_interface)
+    if ((next_key >= 0)
-    {
+#ifdef INTERFACE_CLASSIC
+            && !in_interface
+#endif
+       ) {
         do {
             int current_key = next_key;
             next_key = -1;
@@ -262,67 +264,12 @@ void c_keys_handle_input(int scancode, int pressed)
                 break;
             }
 
-            if ( !(c_keys_is_interface_key(current_key) || (current_key == kPAUSE)) )
-            {
-                break;
-            }
-
-            pthread_mutex_lock(&interface_mutex);
-#ifdef AUDIO_ENABLED
-            SoundSystemPause();
-#endif
-            in_interface = true;
-
-            switch (current_key)
-            {
 #ifdef INTERFACE_CLASSIC
-            case kF1:
+            if ( c_keys_is_interface_key(current_key) || (current_key == kPAUSE) )
-                c_interface_select_diskette( 0 );
+            {
-                break;
+                c_interface_begin(current_key);
-
-            case kF2:
-                c_interface_select_diskette( 1 );
-                break;
-#endif
-
-            case kPAUSE:
-                while (c_mygetch(1) == -1)
-                {
-                    struct timespec ts = { .tv_sec=0, .tv_nsec=1 };
-                    nanosleep(&ts, NULL);
-                }
-                break;
-
-#ifdef INTERFACE_CLASSIC
-            case kF5:
-                c_interface_keyboard_layout();
-                break;
-
-#ifdef DEBUGGER
-            case kF7:
-                c_interface_debugging();
-                break;
-#endif
-
-            case kF8:
-                c_interface_credits();
-                break;
-
-            case kF10:
-                c_interface_parameters();
-                break;
-#endif
-
-            default:
-                break;
             }
-
-#ifdef AUDIO_ENABLED
-            SoundSystemUnpause();
 #endif
-            c_joystick_reset();
-            pthread_mutex_unlock(&interface_mutex);
-            in_interface = false;
 
         } while(0);
     }