From 3ba6ce887bf4c7bf25777a47eb640bbdf09e0c62 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 24 May 2005 10:37:18 +0000
Subject: [PATCH] Added re-entrent mutex to serialize access to OpenFlight
 plugin to prevent any multi-threaded issues.

---
 src/osgPlugins/flt/ReaderWriterFLT.cpp | 3 +++
 src/osgPlugins/flt/ReaderWriterFLT.h   | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/osgPlugins/flt/ReaderWriterFLT.cpp b/src/osgPlugins/flt/ReaderWriterFLT.cpp
index 69296d585..3e8436c34 100644
--- a/src/osgPlugins/flt/ReaderWriterFLT.cpp
+++ b/src/osgPlugins/flt/ReaderWriterFLT.cpp
@@ -25,6 +25,9 @@ osgDB::ReaderWriter::ReadResult ReaderWriterFLT::readObject(const std::string& f
 
 osgDB::ReaderWriter::ReadResult ReaderWriterFLT::readNode(const std::string& file, const osgDB::ReaderWriter::Options* options) const
 {
+    // serialize all access to the OpenFlight plugin as its not thread safe by itself.
+    OpenThreads::ScopedLock<osgDB::ReentrantMutex> lock(_serializerMutex);
+
     std::string ext = osgDB::getLowerCaseFileExtension(file);
     if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;
 
diff --git a/src/osgPlugins/flt/ReaderWriterFLT.h b/src/osgPlugins/flt/ReaderWriterFLT.h
index 01f3cde57..4c61ec49f 100644
--- a/src/osgPlugins/flt/ReaderWriterFLT.h
+++ b/src/osgPlugins/flt/ReaderWriterFLT.h
@@ -1,4 +1,3 @@
-
 //
 // OpenFlightŪ loader for Open Scene Graph
 //
@@ -39,6 +38,7 @@
 
 #include <osgDB/Registry>
 #include <osgDB/FileNameUtils>
+#include <osgDB/ReentrantMutex>
 
 
 namespace flt {
@@ -56,6 +56,10 @@ public:
 
     virtual ReadResult readObject(const std::string& fileName, const osgDB::ReaderWriter::Options*) const;
     virtual ReadResult readNode(const std::string& fileName, const osgDB::ReaderWriter::Options*) const;
+
+protected:
+
+    mutable osgDB::ReentrantMutex _serializerMutex;
 };