Allow sims to shut down normally from panic code.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19718 a1c6a512-1295-4272-9138-f99709370657

uisimulator/common/stubs.c

@@ -342,12 +342,12 @@ void touchpad_set_sensitivity(int level)
 
 void system_exception_wait(void)
 {
-    while(1);
+    thread_sdl_exception_wait();
 }
 
 void system_reboot(void)
 {
-    while(1);
+    thread_sdl_exception_wait();
 }
 
 /* assure an unused place to direct virtual pointers to */

uisimulator/sdl/thread-sdl.c

@@ -64,15 +64,18 @@ extern long start_tick;
 void thread_sdl_shutdown(void)
 {
     int i;
-    /* Take control */
-    SDL_LockMutex(m);
 
     /* Tell all threads jump back to their start routines, unlock and exit
        gracefully - we'll check each one in turn for it's status. Threads
        _could_ terminate via remove_thread or multiple threads could exit
        on each unlock but that is safe. */
+
+    /* Do this before trying to acquire lock */
     threads_exit = true;
 
+    /* Take control */
+    SDL_LockMutex(m);
+
     for (i = 0; i < MAXTHREADS; i++)
     {
         struct thread_entry *thread = &threads[i];
@@ -200,6 +203,16 @@ bool thread_sdl_init(void *param)
     return true;
 }
 
+void thread_sdl_exception_wait(void)
+{
+    while (1)
+    {
+        SDL_Delay(HZ/10);
+        if (threads_exit)
+            thread_exit();
+    }
+}
+
 /* A way to yield and leave the threading system for extended periods */
 void thread_sdl_thread_lock(void *me)
 {

uisimulator/sdl/thread-sdl.h

@@ -27,6 +27,7 @@
 extern SDL_Thread *gui_thread;   /* The "main" thread */
 void thread_sdl_thread_lock(void *me);
 void * thread_sdl_thread_unlock(void);
+void thread_sdl_exception_wait(void);
 bool thread_sdl_init(void *param); /* Init the sim threading API - thread created calls app_main */
 void thread_sdl_shutdown(void); /* Shut down all kernel threads gracefully */
 void thread_sdl_lock(void); /* Sync with SDL threads */