From 118faa538004b903ea09836f7f860096545aa61a Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Thu, 1 May 2025 12:16:30 -0700
Subject: [PATCH] FHU: Add a non-block thread local ringbuffer

I keep rewriting this thing when I want to see some history on
something. Throw it in a FHU utility so I can stop wasting my time.
---
 FEXHeaderUtils/FEXHeaderUtils/RingBuffer.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 FEXHeaderUtils/FEXHeaderUtils/RingBuffer.h

diff --git a/FEXHeaderUtils/FEXHeaderUtils/RingBuffer.h b/FEXHeaderUtils/FEXHeaderUtils/RingBuffer.h
new file mode 100644
index 000000000..2e171ea6f
--- /dev/null
+++ b/FEXHeaderUtils/FEXHeaderUtils/RingBuffer.h
@@ -0,0 +1,21 @@
+#pragma once
+#include <bit>
+#include <cstddef>
+
+namespace FHU {
+// This is a fast thread-local non-blocking ring-buffer.
+// Very useful for debugging purposes to see the history of something.
+template<typename T, size_t Elements>
+requires (std::has_single_bit(Elements) && std::is_trivially_copyable_v<T>)
+class [[deprecated("Not for production use")]] NonBlockRingBuffer final {
+public:
+  void emplace(T Val) {
+    Ring[Current] = Val;
+    Current = (Current + 1) & (Elements - 1);
+  }
+
+private:
+  T Ring[Elements] {};
+  size_t Current {};
+};
+} // namespace FHU