From f84556b4ebee098ae90d1093fa062b799b9463d6 Mon Sep 17 00:00:00 2001
From: Daniel Grunwald <daniel@danielgrunwald.de>
Date: Mon, 2 May 2011 20:24:26 +0200
Subject: [PATCH] Thread-safety fix for Cecil when resetting a method body to
 save memory.

---
 Mono.Cecil/Mono.Cecil/MethodDefinition.cs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Mono.Cecil/Mono.Cecil/MethodDefinition.cs b/Mono.Cecil/Mono.Cecil/MethodDefinition.cs
index 81a0f1b73..dd9d77e96 100644
--- a/Mono.Cecil/Mono.Cecil/MethodDefinition.cs
+++ b/Mono.Cecil/Mono.Cecil/MethodDefinition.cs
@@ -133,8 +133,9 @@ namespace Mono.Cecil {
 
 		public MethodBody Body {
 			get {
-				if (body != null)
-					return body;
+				MethodBody localBody = this.body;
+				if (localBody != null)
+					return localBody;
 
 				if (!HasBody)
 					return null;
@@ -144,7 +145,12 @@ namespace Mono.Cecil {
 
 				return body = new MethodBody (this);
 			}
-			set { body = value; }
+			set { 
+				// we reset Body to null in ILSpy to save memory; so we need that operation to be thread-safe
+				lock (Module.SyncRoot) {
+					body = value;
+				}
+			}
 		}
 
 		public bool HasPInvokeInfo {