fix namespace locking problem when using with FastCGI servers

modules/namespaces.pl

@@ -55,6 +55,8 @@ our ($NamespacesMain, $NamespacesSelf, $NamespaceCurrent,
      $NamespaceRoot, $NamespaceSlashing, @NamespaceParameters,
      %Namespaces, $NamespacesRootDataDir);
 
+our ($OriginalSiteName, $OriginalInterWikiMoniker, $OriginalDataDir, $OriginalScriptName, $OriginalFullUrl, $OriginalStaticDir, $OriginalStaticUrl, $OriginalWikiDescription);
+
 $NamespacesMain = 'Main'; # to get back to the main namespace
 $NamespacesSelf = 'Self'; # for your own namespace
 $NamespaceCurrent = '';   # the current namespace, if any
@@ -104,6 +106,23 @@ sub GetNamespace {
 }
 
 sub NamespacesInitVariables {
+  $OriginalSiteName //= $SiteName;
+  $SiteName = $OriginalSiteName;
+  $OriginalInterWikiMoniker //= $InterWikiMoniker;
+  $InterWikiMoniker = $OriginalInterWikiMoniker;
+  $OriginalDataDir //= $DataDir;
+  $DataDir = $OriginalDataDir;
+  $OriginalScriptName //= $ScriptName;
+  $ScriptName = $OriginalScriptName;
+  $OriginalFullUrl //= $FullUrl;
+  $FullUrl = $OriginalFullUrl;
+  $OriginalStaticDir //= $StaticDir;
+  $StaticDir = $OriginalStaticDir;
+  $OriginalStaticUrl //= $StaticUrl;
+  $StaticUrl = $OriginalStaticUrl;
+  $OriginalWikiDescription //= $WikiDescription;
+  $WikiDescription = $OriginalWikiDescription;
+
   %Namespaces = ();
   # Do this before changing the $DataDir and $ScriptName
   if ($UsePathInfo) {
@@ -129,6 +148,7 @@ sub NamespacesInitVariables {
     $SiteName   .= ' ' . NormalToFree($NamespaceCurrent);
     $InterWikiMoniker = $NamespaceCurrent;
     $DataDir    .= '/' . $NamespaceCurrent;
+  }
   $PageDir     = "$DataDir/page";
   $KeepDir     = "$DataDir/keep";
   $RefererDir  = "$DataDir/referer";
@@ -143,6 +163,9 @@ sub NamespacesInitVariables {
   # $ConfigFile -- shared
   # $ModuleDir -- shared
   # $NearDir -- shared
+  if ($ns
+      and $ns ne $NamespacesMain
+      and $ns ne $NamespacesSelf) {
     $ScriptName .= '/' . UrlEncode($NamespaceCurrent);
     $FullUrl .= '/' . UrlEncode($NamespaceCurrent);
     $StaticDir .= '/' . $NamespaceCurrent; # from static-copy.pl