From bd51feac474c3d08868a70dd7f262d37780a5370 Mon Sep 17 00:00:00 2001
From: "M.Amin Rayej" <m.amin.rayej@gmail.com>
Date: Sun, 17 Mar 2024 14:57:31 +0330
Subject: [PATCH] readme: fix running loom tests guide (#6408)

---
 CONTRIBUTING.md                                  | 4 +++-
 tokio/src/runtime/tests/loom_multi_thread_alt.rs | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 623efd133..240b08be6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -184,9 +184,11 @@ it, `rustfmt` will update your files locally instead.
 You can run loom tests with
 ```
 cd tokio # tokio crate in workspace
-LOOM_MAX_PREEMPTIONS=1 RUSTFLAGS="--cfg loom" \
+LOOM_MAX_PREEMPTIONS=1 LOOM_MAX_BRANCHES=10000 RUSTFLAGS="--cfg loom -C debug_assertions" \
     cargo test --lib --release --features full -- --test-threads=1 --nocapture
 ```
+Additionally, you can also add `--cfg tokio_unstable` to the `RUSTFLAGS` environment variable to
+run loom tests that test unstable features. 
 
 You can run miri tests with
 ```
diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt.rs b/tokio/src/runtime/tests/loom_multi_thread_alt.rs
index 1b9c3b477..c8d140e09 100644
--- a/tokio/src/runtime/tests/loom_multi_thread_alt.rs
+++ b/tokio/src/runtime/tests/loom_multi_thread_alt.rs
@@ -1,3 +1,5 @@
+#![cfg(tokio_unstable)]
+
 mod queue;
 mod shutdown;
 mod yield_now;