From e28b31ec9665f2ec92cf3e1f72fd43b85e3d980c Mon Sep 17 00:00:00 2001
From: Stuart Carnie <stuart.carnie@gmail.com>
Date: Sat, 20 Jan 2024 14:44:46 +1100
Subject: [PATCH] Use `os_unfair_lock` on Apple platforms

---
 core/os/spin_lock.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/core/os/spin_lock.h b/core/os/spin_lock.h
index 93ea782b60e3..d386cd589052 100644
--- a/core/os/spin_lock.h
+++ b/core/os/spin_lock.h
@@ -33,6 +33,25 @@
 
 #include "core/typedefs.h"
 
+#if defined(__APPLE__)
+
+#include <os/lock.h>
+
+class SpinLock {
+	mutable os_unfair_lock _lock = OS_UNFAIR_LOCK_INIT;
+
+public:
+	_ALWAYS_INLINE_ void lock() const {
+		os_unfair_lock_lock(&_lock);
+	}
+
+	_ALWAYS_INLINE_ void unlock() const {
+		os_unfair_lock_unlock(&_lock);
+	}
+};
+
+#else
+
 #include <atomic>
 
 class SpinLock {
@@ -49,4 +68,6 @@ class SpinLock {
 	}
 };
 
+#endif // __APPLE__
+
 #endif // SPIN_LOCK_H