From f9451915b9a7e91e796ba1f1e37e9dfc569608f5 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Mon, 16 Jun 2025 15:07:58 +0300
Subject: [PATCH] LibC: Use `pause` in pthread spinlock locking

---
 userspace/libraries/LibC/pthread.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/userspace/libraries/LibC/pthread.cpp b/userspace/libraries/LibC/pthread.cpp
index 3b32feba..0b8732f9 100644
--- a/userspace/libraries/LibC/pthread.cpp
+++ b/userspace/libraries/LibC/pthread.cpp
@@ -648,7 +648,11 @@ int pthread_spin_lock(pthread_spinlock_t* lock)
 
 	pthread_t expected = 0;
 	while (!BAN::atomic_compare_exchange(*lock, expected, tid, BAN::MemoryOrder::memory_order_acquire))
+	{
+		__builtin_ia32_pause();
 		expected = 0;
+	}
+
 	return 0;
 }