From 8b2e02b71df6548ee5cb1e753deec63680b9145d Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Sun, 7 Mar 2021 04:25:22 +0000
Subject: [PATCH] Ensure global Mutex is initialized before Registry

A Registry instance may be accessed before the global mutex, e.g. here:

https://github.com/openscenegraph/OpenSceneGraph/blob/e77f50371ce6ab05ee0c523fc7a4604ad639e047/src/osgText/Font.cpp#L49

This leads to the Mutex being destroyed before the Registry is destroyed.

This causes a crash at exit, as described in #1048.

Fixes #1048.
---
 include/osgDB/Registry | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/osgDB/Registry b/include/osgDB/Registry
index 2829ca61d..2b317ea91 100644
--- a/include/osgDB/Registry
+++ b/include/osgDB/Registry
@@ -50,7 +50,8 @@ namespace osgDB {
     The RegisterReaderWriterProxy can be used to automatically
     register at runtime a reader/writer with the Registry.
 */
-class OSGDB_EXPORT Registry : public osg::Referenced
+class OSGDB_EXPORT Registry : osg::depends_on<OpenThreads::Mutex*, osg::Referenced::getGlobalReferencedMutex>,
+                              public osg::Referenced
 {
     public: