From c13cf0d69094bd586df16bb5cf1aa306f8923307 Mon Sep 17 00:00:00 2001
From: José Fonseca <jrfonseca@tungstengraphics.com>
Date: Tue, 11 Nov 2008 23:27:27 +0900
Subject: gallium: Make handle_table reentrant.

Ensure that the object has consistent state also when calling the destroy
callback. Namely, ensure the object passed to the callback is removed from
the table prior to calling the destroy callback to avoid a infinite loop or
double free.
---
 src/gallium/auxiliary/util/u_handle_table.c | 34 ++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_handle_table.c b/src/gallium/auxiliary/util/u_handle_table.c
index 2c40011923..2d15932ce3 100644
--- a/src/gallium/auxiliary/util/u_handle_table.c
+++ b/src/gallium/auxiliary/util/u_handle_table.c
@@ -124,6 +124,28 @@ handle_table_resize(struct handle_table *ht,
 }
 
 
+static INLINE void
+handle_table_clear(struct handle_table *ht, 
+                   unsigned index)
+{
+   void *object;
+   
+   /* The order here is important so that the object being destroyed is not
+    * present in the table when seen by the destroy callback, because the 
+    * destroy callback may directly or indirectly call the other functions in 
+    * this module.
+    */
+
+   object = ht->objects[index];
+   if(object) {
+      ht->objects[index] = NULL;
+      
+      if(ht->destroy)
+         ht->destroy(object);
+   }   
+}
+
+
 unsigned
 handle_table_add(struct handle_table *ht, 
                  void *object)
@@ -184,9 +206,8 @@ handle_table_set(struct handle_table *ht,
    if(!handle_table_resize(ht, index))
       return 0;
 
-   if(ht->objects[index] && ht->destroy)
-      ht->destroy(ht->objects[index]);
-      
+   handle_table_clear(ht, index);
+
    ht->objects[index] = object;
    
    return handle;
@@ -227,10 +248,8 @@ handle_table_remove(struct handle_table *ht,
    if(!object)
       return;
    
-   if(ht->destroy)
-      ht->destroy(object);
+   handle_table_clear(ht, index);
 
-   ht->objects[index] = NULL;
    if(index < ht->filled)
       ht->filled = index;
 }
@@ -266,8 +285,7 @@ handle_table_destroy(struct handle_table *ht)
 
    if(ht->destroy)
       for(index = 0; index < ht->size; ++index)
-	 if(ht->objects[index])
-	    ht->destroy(ht->objects[index]);
+         handle_table_clear(ht, index);
    
    FREE(ht->objects);
    FREE(ht);
-- 
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