Fix simulator crashing on MacOS

Event handling must happen on the main
thread for MacOS.

Not sure if button_queue_wait is the
best place for doing the SDL event
polling, but seems to work ok.

Change-Id: If928282df84bdd74e24a48afd7dbc4c4bfcc49e2

apps/tagcache.c

@@ -5176,11 +5176,13 @@ static void tagcache_thread(void)
      * the changes first in foreground. */
     if (db_file_exists(TAGCACHE_FILE_TEMP))
     {
+#if !(defined(__APPLE__) && (CONFIG_PLATFORM & PLATFORM_SDL))
         static const char *lines[] = {ID2P(LANG_TAGCACHE_BUSY),
                                       ID2P(LANG_TAGCACHE_UPDATE)};
         static const struct text_message message = {lines, 2};
 
         if (gui_syncyesno_run_w_tmo(HZ * 5, YESNO_YES, &message, NULL, NULL) == YESNO_YES)
+#endif
         {
             allocate_tempbuf();
             commit();

firmware/drivers/button_queue.c

@@ -22,6 +22,9 @@
 #include "system.h"
 #include "kernel.h"
 #include "button.h"
+#ifdef HAVE_SDL
+#include "button-sdl.h"
+#endif
 
 static struct event_queue button_queue SHAREDBSS_ATTR;
 static intptr_t button_data; /* data value from last message dequeued */
@@ -92,7 +95,29 @@ static void button_queue_wait(struct queue_event *evp, int timeout)
 #else /* ndef HAVE_ADJUSTABLE_CPU_FREQ */
 static inline void button_queue_wait(struct queue_event *evp, int timeout)
 {
+#if defined(__APPLE__) && (CONFIG_PLATFORM & PLATFORM_SDL)
+    unsigned long initial_tick = current_tick;
+    unsigned long curr_tick, remaining;
+    while(true)
+    {
+        handle_sdl_events();
+        queue_wait_w_tmo(&button_queue, evp, TIMEOUT_NOBLOCK);
+        if (evp->id != SYS_TIMEOUT || timeout == TIMEOUT_NOBLOCK)
+            return;
+        else if (timeout == TIMEOUT_BLOCK)
+            sleep(HZ/60);
+        else
+        {
+            curr_tick = current_tick;
+            if (!TIME_AFTER(initial_tick + timeout, curr_tick))
+                return;
+            remaining = ((initial_tick + timeout) - curr_tick);
+            sleep(remaining < HZ/60 ? remaining : HZ/60);
+        }
+    }
+#else
     queue_wait_w_tmo(&button_queue, evp, timeout);
+#endif
 }
 #endif /* HAVE_ADJUSTABLE_CPU_FREQ */
 

firmware/target/hosted/sdl/button-sdl.c

@@ -307,6 +307,15 @@ static bool event_handler(SDL_Event *event)
     return false;
 }
 
+#ifdef __APPLE__
+void handle_sdl_events(void)
+{
+    SDL_Event event;
+    while(SDL_PollEvent(&event))
+        event_handler(&event);
+}
+#endif
+
 void gui_message_loop(void)
 {
     SDL_Event event;

firmware/target/hosted/sdl/button-sdl.h

@@ -28,6 +28,10 @@
 
 extern int sdl_app_has_input_focus;
 
+#ifdef __APPLE__
+void handle_sdl_events(void);
+#endif
+
 bool button_hold(void);
 #undef button_init_device
 void button_init_device(void);

firmware/target/hosted/sdl/system-sdl.c

@@ -138,6 +138,7 @@ static void sdl_window_setup(void)
     }
 }
 
+#ifndef __APPLE__ /* MacOS requires events to be handled on main thread */
 /*
  * This thread will read the buttons in an interrupt like fashion, and
  * also initializes SDL_INIT_VIDEO and the surfaces
@@ -205,6 +206,7 @@ static int sdl_event_thread(void * param)
 #endif
     return 0;
 }
+#endif
 
 static bool quitting;
 
@@ -270,11 +272,13 @@ void system_init(void)
     sdl_window_setup();
 #endif
 
+#ifndef __APPLE__ /* MacOS requires events to be handled on main thread */
     s = SDL_CreateSemaphore(0); /* 0-count so it blocks */
     evt_thread = SDL_CreateThread(sdl_event_thread, NULL, s);
     SDL_SemWait(s);
     /* cleanup */
     SDL_DestroySemaphore(s);
+#endif
 }