Ensure save states are correctly flushed to disk when quitting RetroArch (fixes broken save states when exiting RetroArch - without first closing content - with 'Auto Save State' enabled)

content.h

@@ -51,6 +51,9 @@ bool content_load_state(const char* path, bool load_to_backup_buffer, bool autol
 /* Save a state from memory to disk. */
 bool content_save_state(const char *path, bool save_to_disk, bool autosave);
 
+/* Returns true if a save state task is in progress */
+bool content_save_state_in_progress(void);
+
 /* Copy a save state. */
 bool content_rename_state(const char *origin, const char *dest);
 

retroarch.c

@@ -7771,6 +7771,7 @@ bool command_event(enum event_command cmd, void *data)
 
             command_event_runtime_log_deinit();
             command_event_save_auto_state();
+
 #ifdef HAVE_CONFIGFILE
             if (p_rarch->runloop_overrides_active)
                command_event_disable_overrides();
@@ -28956,6 +28957,13 @@ bool retroarch_main_quit(void)
    if (!p_rarch->runloop_shutdown_initiated)
    {
       command_event_save_auto_state();
+
+      /* If any save states are in progress, wait
+       * until all tasks are complete (otherwise
+       * save state file may be truncated) */
+      if (content_save_state_in_progress())
+         task_queue_wait(NULL, NULL);
+
 #ifdef HAVE_CONFIGFILE
       if (p_rarch->runloop_overrides_active)
          command_event_disable_overrides();

tasks/task_save.c

@@ -1352,6 +1352,31 @@ bool content_save_state(const char *path, bool save_to_disk, bool autosave)
    return true;
 }
 
+static bool task_save_state_finder(retro_task_t *task, void *user_data)
+{
+   if (!task)
+      return false;
+
+   if (task->handler == task_save_handler)
+      return true;
+
+   return false;
+}
+
+/* Returns true if a save state task is in progress */
+bool content_save_state_in_progress(void)
+{
+   task_finder_data_t find_data;
+
+   find_data.func     = task_save_state_finder;
+   find_data.userdata = NULL;
+
+   if (task_queue_find(&find_data))
+      return true;
+
+   return false;
+}
+
 /**
  * content_load_state:
  * @path      : path that state will be loaded from.