From b12b9fa91e3be0d4d157f144f4b20202cdb72917 Mon Sep 17 00:00:00 2001
From: Alexander Gavrilov <angavrilov@gmail.com>
Date: Thu, 23 Aug 2012 19:51:55 +0400
Subject: [PATCH] Suspend DF around loading and unloading plugins.

This is necessary to improve safety of vtable interposing.
---
 library/Core.cpp          | 1 +
 library/PluginManager.cpp | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/library/Core.cpp b/library/Core.cpp
index 71c92afea..a61fef4e9 100644
--- a/library/Core.cpp
+++ b/library/Core.cpp
@@ -1225,6 +1225,7 @@ int Core::Shutdown ( void )
     if(errorstate)
         return true;
     errorstate = 1;
+    CoreSuspendClaimer suspend;
     if(plug_mgr)
     {
         delete plug_mgr;
diff --git a/library/PluginManager.cpp b/library/PluginManager.cpp
index 3c015b2a7..d8b9ff27d 100644
--- a/library/PluginManager.cpp
+++ b/library/PluginManager.cpp
@@ -195,6 +195,9 @@ bool Plugin::load(color_ostream &con)
     {
         return true;
     }
+    // enter suspend
+    CoreSuspender suspend;
+    // open the library, etc
     DFLibrary * plug = OpenPlugin(filename.c_str());
     if(!plug)
     {
@@ -270,6 +273,8 @@ bool Plugin::unload(color_ostream &con)
         }
         // wait for all calls to finish
         access->wait();
+        // enter suspend
+        CoreSuspender suspend;
         // notify plugin about shutdown, if it has a shutdown function
         command_result cr = CR_OK;
         if(plugin_shutdown)