From 4809dc8ec28b8573b250a112b9a7dae4cde10e86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?kleines=20Filmr=C3=B6llchen?= <filmroellchen@serenityos.org>
Date: Thu, 18 Aug 2022 21:44:31 +0200
Subject: [PATCH] AK: Add Singleton special-case constructor for
 SpinlockProtected

This will allow Singletons of that class to still be created when
SpinlockProtected can't be constructed without a lock rank argument
anymore.
---
 AK/Singleton.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/AK/Singleton.h b/AK/Singleton.h
index 3e67dea1304..a0c6fa32902 100644
--- a/AK/Singleton.h
+++ b/AK/Singleton.h
@@ -12,6 +12,7 @@
 #ifdef KERNEL
 #    include <Kernel/Arch/Processor.h>
 #    include <Kernel/Arch/ScopedCritical.h>
+#    include <Kernel/Locking/SpinlockProtected.h>
 #else
 #    include <sched.h>
 #endif
@@ -30,6 +31,18 @@ struct SingletonInstanceCreator {
     }
 };
 
+#ifdef KERNEL
+
+// FIXME: Find a nice way of injecting the lock rank into the singleton.
+template<typename T>
+struct SingletonInstanceCreator<Kernel::SpinlockProtected<T>> {
+    static Kernel::SpinlockProtected<T>* create()
+    {
+        return new Kernel::SpinlockProtected<T> { Kernel::LockRank::None };
+    }
+};
+#endif
+
 template<typename T, T* (*InitFunction)() = SingletonInstanceCreator<T>::create>
 class Singleton {
     AK_MAKE_NONCOPYABLE(Singleton);