validate dispatch loop

include/aws/io/private/event_loop_impl.h

@@ -118,15 +118,6 @@ typedef struct aws_event_loop *(aws_new_event_loop_fn)(struct aws_allocator *all
                                                        const struct aws_event_loop_options *options,
                                                        void *new_loop_user_data);
 
-/**
- * @internal - Don't use outside of testing.
- *
- * Return the default event loop type. If the return value is `AWS_ELT_PLATFORM_DEFAULT`, the function failed to
- * retrieve the default type value.
- * If `aws_event_loop_override_default_type` has been called, return the override default type.
- */
-enum aws_event_loop_type aws_event_loop_get_default_type(void);
-
 struct aws_event_loop_group {
     struct aws_allocator *allocator;
     struct aws_array_list event_loops;
@@ -161,6 +152,16 @@ AWS_IO_API
 struct _OVERLAPPED *aws_overlapped_to_windows_overlapped(struct aws_overlapped *overlapped);
 #endif /* AWS_ENABLE_IO_COMPLETION_PORTS */
 
+/**
+ * @internal - Don't use outside of testing.
+ *
+ * Return the default event loop type. If the return value is `AWS_ELT_PLATFORM_DEFAULT`, the function failed to
+ * retrieve the default type value.
+ * If `aws_event_loop_override_default_type` has been called, return the override default type.
+ */
+AWS_IO_API
+enum aws_event_loop_type aws_event_loop_get_default_type(void);
+
 /**
  * Associates an aws_io_handle with the event loop's I/O Completion Port.
  *

source/darwin/dispatch_queue_event_loop.c

@@ -436,7 +436,7 @@ static void s_run_iteration(void *context) {
  */
 static void s_try_schedule_new_iteration(struct dispatch_loop_context *dispatch_loop_context, uint64_t timestamp) {
     struct dispatch_loop *dispatch_loop = dispatch_loop_context->io_dispatch_loop;
-    if (dispatch_loop->synced_data.suspended)
+    if (!dispatch_loop || dispatch_loop->synced_data.suspended)
         return;
     if (!s_should_schedule_iteration(&dispatch_loop->synced_data.scheduling_state.scheduled_services, timestamp)) {
         return;

tests/event_loop_test.c

@@ -179,9 +179,6 @@ static int s_test_event_loop_canceled_tasks_run_in_el_thread(struct aws_allocato
     }
     ASSERT_INT_EQUALS(AWS_TASK_STATUS_CANCELED, task2_args.status);
 
-    // DEBUG: test sleep 
-    aws_thread_current_sleep(3);
-
     return AWS_OP_SUCCESS;
 }