Avoid rescheduling threads.

ioquatix · ioquatix · commit 5268b41d9f63 · 2022-01-01T15:55:05.000+13:00
diff --git a/thread.c b/thread.c
@@ -1824,7 +1824,7 @@ rb_thread_io_blocking_region(rb_io_t *fptr, rb_blocking_function_t *func, void *
         BLOCKING_REGION(blocking_node.thread, {
             val = func(data1);
             saved_errno = errno;
-        }, ubf_select, blocking_node.thread, FALSE);
+        }, NULL /* ubf_select */, blocking_node.thread, FALSE);
     }
     EC_POP_TAG();
 
@@ -2589,12 +2589,13 @@ rb_notify_io_close(struct rb_io_t *fptr)
     int count = 0;
 
     while (true) {
-        struct rb_io_blocking_node *blocking_node = list_top(&fptr->blocking_list, struct rb_io_blocking_node, list);
+        struct rb_io_blocking_node *blocking_node = list_pop(&fptr->blocking_list, struct rb_io_blocking_node, list);
         if (blocking_node == NULL) break;
 
         rb_threadptr_pending_interrupt_enque(blocking_node->thread, error);
+
+        // This operation is slow:
         rb_threadptr_interrupt(blocking_node->thread);
-        rb_thread_schedule();
 
         count += 1;
     }
