From cee712105850ac3385cd0091a923438167433f9f Mon Sep 17 00:00:00 2001
From: TSR Berry <20988865+TSRBerry@users.noreply.github.com>
Date: Sat, 8 Apr 2023 01:22:00 +0200
Subject: Move solution and projects to src

---
 src/Ryujinx.Common/Pools/ObjectPool.cs        | 75 +++++++++++++++++++++++++++
 src/Ryujinx.Common/Pools/SharedPools.cs       | 17 ++++++
 src/Ryujinx.Common/Pools/ThreadStaticArray.cs | 20 +++++++
 3 files changed, 112 insertions(+)
 create mode 100644 src/Ryujinx.Common/Pools/ObjectPool.cs
 create mode 100644 src/Ryujinx.Common/Pools/SharedPools.cs
 create mode 100644 src/Ryujinx.Common/Pools/ThreadStaticArray.cs

(limited to 'src/Ryujinx.Common/Pools')

diff --git a/src/Ryujinx.Common/Pools/ObjectPool.cs b/src/Ryujinx.Common/Pools/ObjectPool.cs
new file mode 100644
index 00000000..e0bf5df6
--- /dev/null
+++ b/src/Ryujinx.Common/Pools/ObjectPool.cs
@@ -0,0 +1,75 @@
+using System;
+using System.Threading;
+
+namespace Ryujinx.Common
+{
+    public class ObjectPool<T>
+        where T : class
+    {
+        private T _firstItem;
+        private readonly T[] _items;
+
+        private readonly Func<T> _factory;
+
+        public ObjectPool(Func<T> factory, int size)
+        {
+            _items   = new T[size - 1];
+            _factory = factory;
+        }
+
+        public T Allocate()
+        {
+            T instance = _firstItem;
+
+            if (instance == null || instance != Interlocked.CompareExchange(ref _firstItem, null, instance))
+            {
+                instance = AllocateInternal();
+            }
+
+            return instance;
+        }
+
+        private T AllocateInternal()
+        {
+            T[] items = _items;
+
+            for (int i = 0; i < items.Length; i++)
+            {
+                T instance = items[i];
+
+                if (instance != null && instance == Interlocked.CompareExchange(ref items[i], null, instance))
+                {
+                    return instance;
+                }
+            }
+
+            return _factory();
+        }
+
+        public void Release(T obj)
+        {
+            if (_firstItem == null)
+            {
+                _firstItem = obj;
+            }
+            else
+            {
+                ReleaseInternal(obj);
+            }
+        }
+
+        private void ReleaseInternal(T obj)
+        {
+            T[] items = _items;
+
+            for (int i = 0; i < items.Length; i++)
+            {
+                if (items[i] == null)
+                {
+                    items[i] = obj;
+                    break;
+                }
+            }
+        }
+    }
+}
diff --git a/src/Ryujinx.Common/Pools/SharedPools.cs b/src/Ryujinx.Common/Pools/SharedPools.cs
new file mode 100644
index 00000000..b4860b85
--- /dev/null
+++ b/src/Ryujinx.Common/Pools/SharedPools.cs
@@ -0,0 +1,17 @@
+namespace Ryujinx.Common
+{
+    public static class SharedPools
+    {
+        private static class DefaultPool<T>
+            where T : class, new()
+        {
+            public static readonly ObjectPool<T> Instance = new ObjectPool<T>(() => new T(), 20);
+        }
+
+        public static ObjectPool<T> Default<T>()
+            where T : class, new()
+        {
+            return DefaultPool<T>.Instance;
+        }
+    }
+}
diff --git a/src/Ryujinx.Common/Pools/ThreadStaticArray.cs b/src/Ryujinx.Common/Pools/ThreadStaticArray.cs
new file mode 100644
index 00000000..21434a02
--- /dev/null
+++ b/src/Ryujinx.Common/Pools/ThreadStaticArray.cs
@@ -0,0 +1,20 @@
+using System;
+
+namespace Ryujinx.Common.Pools
+{
+    public static class ThreadStaticArray<T>
+    {
+        [ThreadStatic]
+        private static T[] _array;
+
+        public static ref T[] Get()
+        {
+            if (_array == null)
+            {
+                _array = new T[1];
+            }
+
+            return ref _array;
+        }
+    }
+}
-- 
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