From 5f8bb1a790e48650f65f34523efc133a140b6609 Mon Sep 17 00:00:00 2001
From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Sun, 14 Oct 2007 23:28:40 +0000
Subject: [PATCH] Put mutexes around the reference counts for the shared_object
 class.  Maybe this will help prevent crashes.

git-svn-id: http://svn.voria.com/code@931 1f10aa63-cdf2-0310-b900-c93c546f37ac
---
 ETL/trunk/ETL/_handle.h | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/ETL/trunk/ETL/_handle.h b/ETL/trunk/ETL/_handle.h
index 83a9ab5..6a46f85 100644
--- a/ETL/trunk/ETL/_handle.h
+++ b/ETL/trunk/ETL/_handle.h
@@ -31,7 +31,13 @@
 
 /* === H E A D E R S ======================================================= */
 
+// include the next line in an attempt to increase stability
+#define ETL_LOCK_REFCOUNTS
+
 #include <cassert>
+#ifdef ETL_LOCK_REFCOUNTS
+#include <glibmm/thread.h>
+#endif
 
 /* === M A C R O S ========================================================= */
 
@@ -66,6 +72,9 @@ class shared_object
 {
 private:
 	mutable int refcount;
+#ifdef ETL_LOCK_REFCOUNTS
+	mutable Glib::Mutex mutex;
+#endif
 
 protected:
 	shared_object():refcount(0) { }
@@ -78,11 +87,19 @@ protected:
 
 public:
 	void ref()const
-		{ assert(refcount>=0); refcount++; }
+	{
+#ifdef ETL_LOCK_REFCOUNTS
+		Glib::Mutex::Lock lock(mutex);
+#endif
+		assert(refcount>=0); refcount++;
+	}
 
 	//! Returns \c false if object needs to be deleted
 	bool unref()const
 	{
+#ifdef ETL_LOCK_REFCOUNTS
+		Glib::Mutex::Lock lock(mutex);
+#endif
 		assert(refcount>0);
 
 		refcount--;
@@ -90,6 +107,9 @@ public:
 		if(refcount==0) {
 #ifdef ETL_SELF_DELETING_SHARED_OBJECT
 			refcount=-666;
+#ifdef ETL_LOCK_REFCOUNTS
+			lock.release();
+#endif
 			delete this;
 #endif
 			return false;
@@ -99,7 +119,12 @@ public:
 	}
 
 	int count()const
-		{ return refcount; }
+	{ 
+#ifdef ETL_LOCK_REFCOUNTS
+		Glib::Mutex::Lock lock(mutex);
+#endif
+		return refcount;
+	}
 }; // END of class shared_object
 
 // ========================================================================
-- 
2.7.4