From e9c47b2dea45097a2761ebf2b3695adc456e8f26 Mon Sep 17 00:00:00 2001
From: Shad Storhaug <shad@shadstorhaug.com>
Date: Sun, 14 May 2023 23:04:14 +0700
Subject: [PATCH] Lucene.Net.Store.OutputStreamDataOutput: Allow double-dispose
 calls and guard against usage after Dispose(). See #265.

---
 src/Lucene.Net/Store/OutputStreamDataOutput.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Lucene.Net/Store/OutputStreamDataOutput.cs b/src/Lucene.Net/Store/OutputStreamDataOutput.cs
index f635a2b366..7a96de6a83 100644
--- a/src/Lucene.Net/Store/OutputStreamDataOutput.cs
+++ b/src/Lucene.Net/Store/OutputStreamDataOutput.cs
@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Threading;
 
 namespace Lucene.Net.Store
 {
@@ -26,6 +27,7 @@ namespace Lucene.Net.Store
     public class OutputStreamDataOutput : DataOutput, IDisposable
     {
         private readonly Stream _os;
+        private int disposed = 0; // LUCENENET specific - allow double-dispose
 
         public OutputStreamDataOutput(Stream os)
         {
@@ -60,6 +62,8 @@ public void Dispose()
         // LUCENENET specific - implemented proper dispose pattern
         protected virtual void Dispose(bool disposing)
         {
+            if (0 != Interlocked.CompareExchange(ref this.disposed, 1, 0)) return; // LUCENENET specific - allow double-dispose
+
             if (disposing)
             {
                 _os.Dispose();