From: Filip Navara <filip.navara@gmail.com>
Date: Tue, 25 Dec 2018 04:55:30 +0000 (+0100)
Subject: Makes CultureInfo.get_Parent thread safe. (dotnet/coreclr#21671)
X-Git-Tag: submit/tizen/20210909.063632~11030^2~2997
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b7a25839816aae6bffaf36b08b5cee2e10fd49e9;p=platform%2Fupstream%2Fdotnet%2Fruntime.git

Makes CultureInfo.get_Parent thread safe. (dotnet/coreclr#21671)



Commit migrated from https://github.com/dotnet/coreclr/commit/6d94edc9a794569cd8cf8b300c017b5451f36fd7
---

diff --git a/src/coreclr/src/System.Private.CoreLib/src/System/Globalization/CultureInfo.cs b/src/coreclr/src/System.Private.CoreLib/src/System/Globalization/CultureInfo.cs
index f0da4bf..84d7ac2 100644
--- a/src/coreclr/src/System.Private.CoreLib/src/System/Globalization/CultureInfo.cs
+++ b/src/coreclr/src/System.Private.CoreLib/src/System/Globalization/CultureInfo.cs
@@ -495,23 +495,26 @@ namespace System.Globalization
             {
                 if (null == _parent)
                 {
+                    CultureInfo culture = null;
                     string parentName = _cultureData.SPARENT;
 
                     if (string.IsNullOrEmpty(parentName))
                     {
-                        _parent = InvariantCulture;
+                        culture = InvariantCulture;
                     }
                     else
                     {
-                        _parent = CreateCultureInfoNoThrow(parentName, _cultureData.UseUserOverride);
-                        if (_parent == null)
+                        culture = CreateCultureInfoNoThrow(parentName, _cultureData.UseUserOverride);
+                        if (culture == null)
                         {
                             // For whatever reason our IPARENT or SPARENT wasn't correct, so use invariant
                             // We can't allow ourselves to fail.  In case of custom cultures the parent of the
                             // current custom culture isn't installed.
-                            _parent = InvariantCulture;
+                            culture = InvariantCulture;
                         }
                     }
+
+                    Interlocked.CompareExchange<CultureInfo>(ref _parent, culture, null);
                 }
                 return _parent;
             }