core: hle: kernel: Implement KLightLock.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/core/hle/kernel/k_light_lock.h b/src/core/hle/kernel/k_light_lock.h
new file mode 100644
index 000000000..f4c45f76a
--- /dev/null
+++ b/src/core/hle/kernel/k_light_lock.h
@@ -0,0 +1,41 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+
+#include "common/common_types.h"
+#include "core/hle/kernel/k_scoped_lock.h"
+
+namespace Kernel {
+
+class KernelCore;
+
+class KLightLock {
+public:
+    explicit KLightLock(KernelCore& kernel_) : kernel{kernel_} {}
+
+    void Lock();
+
+    void Unlock();
+
+    void LockSlowPath(uintptr_t owner, uintptr_t cur_thread);
+
+    void UnlockSlowPath(uintptr_t cur_thread);
+
+    bool IsLocked() const {
+        return tag != 0;
+    }
+
+    bool IsLockedByCurrentThread() const;
+
+private:
+    std::atomic<uintptr_t> tag{};
+    KernelCore& kernel;
+};
+
+using KScopedLightLock = KScopedLock<KLightLock>;
+
+} // namespace Kernel