g_hash_table_new_full(): create hash tables with a ref count of 1.

Tue Nov 22 14:04:26 2005  Tim Janik  <timj@imendio.com>

        * glib/ghash.h:
        * glib/ghash.c:
        g_hash_table_new_full(): create hash tables with a ref count of 1.
        g_hash_table_ref(): atomically ref_count+=1
        g_hash_table_unref(): atomically ref_count-=1, destroys hash table
        when refcount reaches 0.
        g_hash_table_destroy(): just destroy keys and values, unref by 1.
        g_hash_table_insert():
        g_hash_table_replace(): assert ref_count>0.

        * glib/gatomic.h:
        * glib/gatomic.c: added 'volatile' qualifier to all atomic pointer and
        integer pointers.

ChangeLog

@@ -1,3 +1,19 @@
+Tue Nov 22 14:04:26 2005  Tim Janik  <timj@imendio.com>
+
+	* glib/ghash.h: 
+	* glib/ghash.c: 
+	g_hash_table_new_full(): create hash tables with a ref count of 1.
+	g_hash_table_ref(): atomically ref_count+=1
+	g_hash_table_unref(): atomically ref_count-=1, destroys hash table
+	when refcount reaches 0.
+	g_hash_table_destroy(): just destroy keys and values, unref by 1.
+	g_hash_table_insert(): 
+	g_hash_table_replace(): assert ref_count>0.
+
+	* glib/gatomic.h: 
+	* glib/gatomic.c: added 'volatile' qualifier to all atomic pointer and
+	integer pointers.
+
 2005-11-20  Behdad Esfahbod  <behdad@gnome.org>
 
 	* glib/guniprop.c (g_unichar_get_mirror_char): Remove unused

ChangeLog.pre-2-10

@@ -1,3 +1,19 @@
+Tue Nov 22 14:04:26 2005  Tim Janik  <timj@imendio.com>
+
+	* glib/ghash.h: 
+	* glib/ghash.c: 
+	g_hash_table_new_full(): create hash tables with a ref count of 1.
+	g_hash_table_ref(): atomically ref_count+=1
+	g_hash_table_unref(): atomically ref_count-=1, destroys hash table
+	when refcount reaches 0.
+	g_hash_table_destroy(): just destroy keys and values, unref by 1.
+	g_hash_table_insert(): 
+	g_hash_table_replace(): assert ref_count>0.
+
+	* glib/gatomic.h: 
+	* glib/gatomic.c: added 'volatile' qualifier to all atomic pointer and
+	integer pointers.
+
 2005-11-20  Behdad Esfahbod  <behdad@gnome.org>
 
 	* glib/guniprop.c (g_unichar_get_mirror_char): Remove unused

ChangeLog.pre-2-12

@@ -1,3 +1,19 @@
+Tue Nov 22 14:04:26 2005  Tim Janik  <timj@imendio.com>
+
+	* glib/ghash.h: 
+	* glib/ghash.c: 
+	g_hash_table_new_full(): create hash tables with a ref count of 1.
+	g_hash_table_ref(): atomically ref_count+=1
+	g_hash_table_unref(): atomically ref_count-=1, destroys hash table
+	when refcount reaches 0.
+	g_hash_table_destroy(): just destroy keys and values, unref by 1.
+	g_hash_table_insert(): 
+	g_hash_table_replace(): assert ref_count>0.
+
+	* glib/gatomic.h: 
+	* glib/gatomic.c: added 'volatile' qualifier to all atomic pointer and
+	integer pointers.
+
 2005-11-20  Behdad Esfahbod  <behdad@gnome.org>
 
 	* glib/guniprop.c (g_unichar_get_mirror_char): Remove unused

glib/gatomic.c

@@ -31,7 +31,7 @@
 /* Adapted from CVS version 1.10 of glibc's sysdeps/i386/i486/bits/atomic.h 
  */
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic, 
 			       gint           val)
 {
   gint result;
@@ -43,7 +43,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
 }
  
 void
-g_atomic_int_add (gint *atomic, 
+g_atomic_int_add (volatile gint *atomic, 
 		  gint           val)
 {
   __asm__ __volatile__ ("lock; addl %1,%0"
@@ -52,7 +52,7 @@ g_atomic_int_add (gint *atomic,
 }
 
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic, 
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -70,7 +70,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
  * arguments and calling the former function */
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -98,7 +98,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 
 #  if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -111,7 +111,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 }
 #  elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -157,7 +157,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
   })
 #  if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -183,7 +183,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 }
 #  elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -215,7 +215,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 /* Adapted from CVS version 1.9 of glibc's sysdeps/x86_64/bits/atomic.h 
  */
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic,
 			       gint           val)
 {
   gint result;
@@ -227,7 +227,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
 }
  
 void
-g_atomic_int_add (gint *atomic, 
+g_atomic_int_add (volatile gint *atomic, 
 		  gint           val)
 {
   __asm__ __volatile__ ("lock; addl %1,%0"
@@ -236,7 +236,7 @@ g_atomic_int_add (gint *atomic,
 }
 
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic, 
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -250,7 +250,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -272,7 +272,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 /* Non-optimizing compile bails on the following two asm statements
  * for reasons unknown to the author */
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic, 
 			       gint           val)
 {
   gint result, temp;
@@ -288,7 +288,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
  
 /* The same as above, to save a function call repeated here */
 void
-g_atomic_int_add (gint *atomic, 
+g_atomic_int_add (volatile gint *atomic, 
 		  gint           val)
 {
   gint result, temp;  
@@ -302,7 +302,7 @@ g_atomic_int_add (gint *atomic,
 }
 #   else /* !__OPTIMIZE__ */
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic, 
 			       gint           val)
 {
   gint result;
@@ -314,7 +314,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
 }
  
 void
-g_atomic_int_add (gint *atomic, 
+g_atomic_int_add (volatile gint *atomic,
 		  gint           val)
 {
   gint result;
@@ -326,7 +326,7 @@ g_atomic_int_add (gint *atomic,
 
 #   if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic, 
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -345,7 +345,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -364,7 +364,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 }
 #   elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic,
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -384,7 +384,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -411,7 +411,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 /* Adapted from CVS version 1.8 of glibc's sysdeps/ia64/bits/atomic.h
  */
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic,
 			       gint           val)
 {
   return __sync_fetch_and_add_si (atomic, val);
@@ -425,7 +425,7 @@ g_atomic_int_add (gint *atomic,
 }
 
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic,
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -433,7 +433,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic,
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -456,7 +456,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 
 #  if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic,
 				       gpointer           oldval,
 				       gpointer           newval)
 {
@@ -468,7 +468,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 }
 #  elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic,
 				       gpointer           oldval,
 				       gpointer           newval)
 {
@@ -496,21 +496,21 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 #ifdef DEFINE_WITH_WIN32_INTERLOCKED
 # include <windows.h>
 gint32   
-g_atomic_int_exchange_and_add (gint32   *atomic, 
+g_atomic_int_exchange_and_add (volatile gint32 *atomic,
 			       gint32           val)
 {
   return InterlockedExchangeAdd (atomic, val);
 }
 
 void     
-g_atomic_int_add (gint32   *atomic, 
+g_atomic_int_add (volatile gint32 *atomic, 
 		  gint32           val)
 {
   InterlockedExchangeAdd (atomic, val);
 }
 
 gboolean 
-g_atomic_int_compare_and_exchange (gint32   *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint32 *atomic,
 				   gint32           oldval,
 				   gint32           newval)
 {
@@ -520,7 +520,7 @@ g_atomic_int_compare_and_exchange (gint32   *atomic,
 }
 
 gboolean 
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic,
 				       gpointer           oldval,
 				       gpointer           newval)
 {
@@ -537,7 +537,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 static GMutex *g_atomic_mutex; 
 
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic, 
 			       gint           val)
 {
   gint result;
@@ -552,7 +552,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
 
 
 void
-g_atomic_int_add (gint *atomic,
+g_atomic_int_add (volatile gint *atomic,
 		  gint           val)
 {
   g_mutex_lock (g_atomic_mutex);
@@ -561,7 +561,7 @@ g_atomic_int_add (gint *atomic,
 }
 
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic, 
 				   gint           oldval, 
 				   gint           newval)
 {
@@ -581,7 +581,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gboolean
-g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
@@ -602,7 +602,7 @@ g_atomic_pointer_compare_and_exchange (gpointer *atomic,
 
 #ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 gint
-g_atomic_int_get (gint *atomic)
+g_atomic_int_get (volatile gint *atomic)
 {
   gint result;
 
@@ -614,7 +614,7 @@ g_atomic_int_get (gint *atomic)
 }
 
 gpointer
-g_atomic_pointer_get (gpointer *atomic)
+g_atomic_pointer_get (volatile gpointer *atomic)
 {
   gpointer result;
 
@@ -627,7 +627,7 @@ g_atomic_pointer_get (gpointer *atomic)
 #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */   
 #elif defined (G_ATOMIC_OP_MEMORY_BARRIER_NEEDED)
 gint
-g_atomic_int_get (gint *atomic)
+g_atomic_int_get (volatile gint *atomic)
 {
   gint result = *atomic;
 
@@ -637,7 +637,7 @@ g_atomic_int_get (gint *atomic)
 }
 
 gpointer
-g_atomic_pointer_get (gpointer *atomic)
+g_atomic_pointer_get (volatile gpointer *atomic)
 {
   gpointer result = *atomic;
 
@@ -649,7 +649,7 @@ g_atomic_pointer_get (gpointer *atomic)
 
 #ifdef ATOMIC_INT_CMP_XCHG
 gboolean
-g_atomic_int_compare_and_exchange (gint *atomic, 
+g_atomic_int_compare_and_exchange (volatile gint *atomic,
 				   gint           oldval,
 				   gint           newval)
 {
@@ -657,7 +657,7 @@ g_atomic_int_compare_and_exchange (gint *atomic,
 }
 
 gint
-g_atomic_int_exchange_and_add (gint *atomic, 
+g_atomic_int_exchange_and_add (volatile gint *atomic,
 			       gint           val)
 {
   gint result;
@@ -669,7 +669,7 @@ g_atomic_int_exchange_and_add (gint *atomic,
 }
  
 void
-g_atomic_int_add (gint *atomic, 
+g_atomic_int_add (volatile gint *atomic,
 		  gint           val)
 {
   gint result;
@@ -689,13 +689,13 @@ _g_atomic_thread_init (void)
 
 #ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 gint
-(g_atomic_int_get) (gint *atomic)
+(g_atomic_int_get) (volatile gint *atomic)
 {
   return g_atomic_int_get (atomic);
 }
 
 gpointer
-(g_atomic_pointer_get) (gpointer *atomic)
+(g_atomic_pointer_get) (volatile gpointer *atomic)
 {
   return g_atomic_pointer_get (atomic);
 }

glib/gatomic.h

@@ -34,19 +34,19 @@
 
 G_BEGIN_DECLS
  
-gint     g_atomic_int_exchange_and_add         (gint     *atomic, 
+gint     g_atomic_int_exchange_and_add         (volatile gint	   *atomic,
 						gint      	    val);
-void     g_atomic_int_add                      (gint     *atomic, 
+void     g_atomic_int_add                      (volatile gint	   *atomic,
 						gint      	    val);
-gboolean g_atomic_int_compare_and_exchange     (gint     *atomic, 
+gboolean g_atomic_int_compare_and_exchange     (volatile gint	   *atomic,
 						gint      	    oldval,
 						gint      	   newval);
-gboolean g_atomic_pointer_compare_and_exchange (gpointer *atomic, 
+gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
 						gpointer  	   oldval, 
 						gpointer  	   newval);
 
-gint     g_atomic_int_get                      (gint     *atomic);
+gint     g_atomic_int_get                      (volatile gint  	  *atomic);
-gpointer g_atomic_pointer_get                  (gpointer *atomic);
+gpointer g_atomic_pointer_get                  (volatile gpointer *atomic);
 
 #ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 # define g_atomic_int_get(atomic) (*(atomic))

glib/ghash.c

@@ -54,6 +54,7 @@ struct _GHashTable
   GHashNode      **nodes;
   GHashFunc        hash_func;
   GEqualFunc       key_equal_func;
+  volatile guint   ref_count;
   GDestroyNotify   key_destroy_func;
   GDestroyNotify   value_destroy_func;
 };
@@ -98,7 +99,7 @@ static guint g_hash_table_foreach_remove_or_steal (GHashTable     *hash_table,
  *   directly in a similar fashion to g_direct_equal(), but without the
  *   overhead of a function call.
  *
- * Creates a new #GHashTable.
+ * Creates a new #GHashTable with a reference count of 1.
  * 
  * Return value: a new #GHashTable.
  **/
@@ -121,9 +122,9 @@ g_hash_table_new (GHashFunc    hash_func,
  *   value used when removing the entry from the #GHashTable or %NULL if 
  *   you don't want to supply such a function.
  * 
- * Creates a new #GHashTable like g_hash_table_new() and allows to specify
+ * Creates a new #GHashTable like g_hash_table_new() with a reference count
- * functions to free the memory allocated for the key and value that get 
+ * of 1 and allows to specify functions to free the memory allocated for the
- * called when removing the entry from the #GHashTable.
+ * key and value that get called when removing the entry from the #GHashTable.
  * 
  * Return value: a new #GHashTable.
  **/
@@ -134,32 +135,77 @@ g_hash_table_new_full (GHashFunc       hash_func,
 		       GDestroyNotify  value_destroy_func)
 {
   GHashTable *hash_table;
-  guint i;
   
   hash_table = g_slice_new (GHashTable);
   hash_table->size               = HASH_TABLE_MIN_SIZE;
   hash_table->nnodes             = 0;
   hash_table->hash_func          = hash_func ? hash_func : g_direct_hash;
   hash_table->key_equal_func     = key_equal_func;
+  hash_table->ref_count          = 1;
   hash_table->key_destroy_func   = key_destroy_func;
   hash_table->value_destroy_func = value_destroy_func;
-  hash_table->nodes              = g_new (GHashNode*, hash_table->size);
+  hash_table->nodes              = g_new0 (GHashNode*, hash_table->size);
-  
-  for (i = 0; i < hash_table->size; i++)
-    hash_table->nodes[i] = NULL;
   
   return hash_table;
 }
 
+
+/**
+ * g_hash_table_ref:
+ * @hash_table: a valid #GHashTable.
+ * 
+ * Atomically increments the reference count of @hash_table by one.
+ * This function is MT-safe and may be called from any thread.
+ * 
+ * Return value: the passed in #GHashTable.
+ **/
+GHashTable*
+g_hash_table_ref (GHashTable *hash_table)
+{
+  g_return_val_if_fail (hash_table != NULL, NULL);
+  g_return_val_if_fail (hash_table->ref_count > 0, hash_table);
+
+  g_atomic_int_add (&hash_table->ref_count, 1);
+  return hash_table;
+}
+
+/**
+ * g_hash_table_unref:
+ * @hash_table: a valid #GHashTable.
+ * 
+ * Atomically decrements the reference count of @hash_table by one.
+ * If the reference count drops to 0, all keys and values will be
+ * destroyed, and all memory allocated by the hash table is released.
+ * This function is MT-safe and may be called from any thread.
+ **/
+void
+g_hash_table_unref (GHashTable *hash_table)
+{
+  g_return_if_fail (hash_table != NULL);
+  g_return_if_fail (hash_table->ref_count > 0);
+
+  if (g_atomic_int_exchange_and_add (&hash_table->ref_count, -1) - 1 == 0)
+    {
+      guint i;
+      for (i = 0; i < hash_table->size; i++)
+        g_hash_nodes_destroy (hash_table->nodes[i], 
+                              hash_table->key_destroy_func,
+                              hash_table->value_destroy_func);
+      g_free (hash_table->nodes);
+      g_slice_free (GHashTable, hash_table);
+    }
+}
+
 /**
  * g_hash_table_destroy:
  * @hash_table: a #GHashTable.
  * 
- * Destroys the #GHashTable. If keys and/or values are dynamically 
+ * Destroys all keys and values in the #GHashTable and decrements it's
- * allocated, you should either free them first or create the #GHashTable
+ * reference count by 1. If keys and/or values are dynamically allocated,
- * using g_hash_table_new_full(). In the latter case the destroy functions 
+ * you should either free them first or create the #GHashTable with destroy
- * you supplied will be called on all keys and values before destroying 
+ * notifiers using g_hash_table_new_full(). In the latter case the destroy
- * the #GHashTable.
+ * functions you supplied will be called on all keys and values during the
+ * destruction phase.
  **/
 void
 g_hash_table_destroy (GHashTable *hash_table)
@@ -167,14 +213,19 @@ g_hash_table_destroy (GHashTable *hash_table)
   guint i;
   
   g_return_if_fail (hash_table != NULL);
+  g_return_if_fail (hash_table->ref_count > 0);
   
   for (i = 0; i < hash_table->size; i++)
+    {
       g_hash_nodes_destroy (hash_table->nodes[i], 
                             hash_table->key_destroy_func,
                             hash_table->value_destroy_func);
+      hash_table->nodes[i] = NULL;
+    }
+  hash_table->nnodes = 0;
+  hash_table->size = HASH_TABLE_MIN_SIZE;
 
-  g_free (hash_table->nodes);
+  g_hash_table_unref (hash_table);
-  g_slice_free (GHashTable, hash_table);
 }
 
 static inline GHashNode**
@@ -286,6 +337,7 @@ g_hash_table_insert (GHashTable *hash_table,
   GHashNode **node;
   
   g_return_if_fail (hash_table != NULL);
+  g_return_if_fail (hash_table->ref_count > 0);
   
   node = g_hash_table_lookup_node (hash_table, key);
   
@@ -334,6 +386,7 @@ g_hash_table_replace (GHashTable *hash_table,
   GHashNode **node;
   
   g_return_if_fail (hash_table != NULL);
+  g_return_if_fail (hash_table->ref_count > 0);
   
   node = g_hash_table_lookup_node (hash_table, key);
   
@@ -686,5 +739,6 @@ g_hash_nodes_destroy (GHashNode *hash_node,
     }
 }
 
+
 #define __G_HASH_C__
 #include "galiasdef.c"

glib/ghash.h

@@ -76,6 +76,10 @@ guint	    g_hash_table_foreach_steal	   (GHashTable	   *hash_table,
 					    gpointer	    user_data);
 guint	    g_hash_table_size		   (GHashTable	   *hash_table);
 
+/* keeping hash tables alive */
+GHashTable* g_hash_table_ref   		   (GHashTable 	   *hash_table);
+void        g_hash_table_unref             (GHashTable     *hash_table);
+
 #ifndef G_DISABLE_DEPRECATED
 
 /* The following two functions are deprecated and will be removed in

glib/glib.symbols

@@ -287,6 +287,8 @@ g_mkstemp_utf8
 #if IN_HEADER(__G_HASH_H__)
 #if IN_FILE(__G_HASH_C__)
 g_hash_table_destroy
+g_hash_table_unref
+g_hash_table_ref
 g_hash_table_find
 g_hash_table_foreach
 g_hash_table_foreach_remove