From e2849c6788e3611256119fa7c86e2b79f658fa70 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Mon, 11 Sep 2023 16:43:29 -0400
Subject: [PATCH] add fence to io thread

---
 src/threading.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/threading.c b/src/threading.c
index 12df923e790a8..a82b2bcd6ac44 100644
--- a/src/threading.c
+++ b/src/threading.c
@@ -709,13 +709,15 @@ void jl_utility_io_threadfun(void *arg)
     jl_ptls_t ptls = jl_current_task->ptls;
     int8_t gc_state  = jl_gc_safe_enter(ptls);
     while (1) {
+        jl_fence(); // [^store_buffering_2]
         if (jl_atomic_load_relaxed(&jl_uv_n_waiters) == 0)
+        {
             if (JL_UV_TRYLOCK_NOGC())
             {
                 jl_process_events_locked();
                 JL_UV_UNLOCK_NOGC();
             }
-        // TODO: jl_fence(); // [^store_buffering_2]
+        }
     }
     jl_gc_safe_leave(ptls, gc_state);
     return;