From f8a2f31ae48fbcf8b71684851b3652007a7094d7 Mon Sep 17 00:00:00 2001
From: ShE3py <52315535+she3py@users.noreply.github.com>
Date: Sun, 20 Aug 2023 21:50:45 +0200
Subject: [PATCH] Add data race test to `std::env::{get, set}`

---
 library/std/tests/env.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/library/std/tests/env.rs b/library/std/tests/env.rs
index 96b4f372b8b10..a1ca85c2145f5 100644
--- a/library/std/tests/env.rs
+++ b/library/std/tests/env.rs
@@ -5,6 +5,7 @@ use rand::distributions::{Alphanumeric, DistString};
 
 mod common;
 use common::test_rng;
+use std::thread;
 
 #[track_caller]
 fn make_rand_name() -> OsString {
@@ -140,3 +141,22 @@ fn env_home_dir() {
         }
     }
 }
+
+#[test] // miri shouldn't detect any data race in this fn
+#[cfg_attr(any(not(miri), target_os = "emscripten"), ignore)]
+fn test_env_get_set_multithreaded() {
+    let getter = thread::spawn(|| {
+        for _ in 0..100 {
+            let _ = var_os("foo");
+        }
+    });
+
+    let setter = thread::spawn(|| {
+        for _ in 0..100 {
+            set_var("foo", "bar");
+        }
+    });
+
+    let _ = getter.join();
+    let _ = setter.join();
+}