From 57c9f5a8a8021a6bfe2750c350a7cef3d7a31d5e Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Mon, 4 Aug 2025 19:07:44 +0300
Subject: [PATCH] LibC: lock mutex when pthread_cond_timedwait times out

---
 userspace/libraries/LibC/pthread.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/userspace/libraries/LibC/pthread.cpp b/userspace/libraries/LibC/pthread.cpp
index 48f7fe85..c60b758b 100644
--- a/userspace/libraries/LibC/pthread.cpp
+++ b/userspace/libraries/LibC/pthread.cpp
@@ -1164,7 +1164,10 @@ int pthread_cond_timedwait(pthread_cond_t* __restrict cond, pthread_mutex_t* __r
 	while (BAN::atomic_load(block.signaled) == 0)
 	{
 		if (has_timed_out(abstime, cond->attr.clock))
+		{
+			pthread_mutex_lock(mutex);
 			return ETIMEDOUT;
+		}
 		sched_yield();
 	}