fix preallocation logic, support DISABLE_MEM_POOLS properly, group value

Sun Aug 12 02:07:10 2001  Tim Janik  <timj@gtk.org>

        * gvaluearray.[hc]: fix preallocation logic, support DISABLE_MEM_POOLS
        properly, group value allocations.
        (g_value_array_new): fix semantic of n_prealloced argument, so it's
        really just about preallocation space.

1 files changed, 54 insertions, 11 deletions

diff --git a/gobject/gvaluearray.c b/gobject/gvaluearray.c
index 30bc6b9e6..44685482e 100644
--- a/gobject/gvaluearray.c
+++ b/gobject/gvaluearray.c
@@ -25,6 +25,11 @@
 #include	<string.h>
 #include	<stdlib.h>	/* qsort() */
 
+#ifdef	DISABLE_MEM_POOLS
+#  define	GROUP_N_VALUES	(1)	/* power of 2 !! */
+#else
+#  define	GROUP_N_VALUES	(8)	/* power of 2 !! */
+#endif
 
 
 /* --- functions --- */
@@ -38,14 +43,49 @@ g_value_array_get_nth (GValueArray *value_array,
   return value_array->values + index;
 }
 
+static inline void
+value_array_grow (GValueArray *value_array,
+		  guint        n_values,
+		  gboolean     zero_init)
+{
+  g_return_if_fail (n_values >= value_array->n_values);
+
+  value_array->n_values = n_values;
+  if (value_array->n_values > value_array->n_prealloced)
+    {
+      guint i = value_array->n_prealloced;
+
+      value_array->n_prealloced = (value_array->n_values + GROUP_N_VALUES - 1) & ~(GROUP_N_VALUES - 1);
+      value_array->values = g_renew (GValue, value_array->values, value_array->n_prealloced);
+      if (!zero_init)
+	i = value_array->n_values;
+      memset (value_array->values + i, 0,
+	      (value_array->n_prealloced - i) * sizeof (value_array->values[0]));
+    }
+}
+
+static inline void
+value_array_shrink (GValueArray *value_array)
+{
+#ifdef  DISABLE_MEM_POOLS
+  if (value_array->n_prealloced >= value_array->n_values + GROUP_N_VALUES)
+    {
+      value_array->n_prealloced = (value_array->n_values + GROUP_N_VALUES - 1) & ~(GROUP_N_VALUES - 1);
+      value_array->values = g_renew (GValue, value_array->values, value_array->n_prealloced);
+    }
+#endif
+}
+
 GValueArray*
 g_value_array_new (guint n_prealloced)
 {
-  GValueArray *value_array = g_new0 (GValueArray, 1);
+  GValueArray *value_array = g_new (GValueArray, 1);
 
-  value_array->n_values = n_prealloced;
-  value_array->values = g_renew (GValue, value_array->values, value_array->n_values);
-  memset (value_array->values, 0, value_array->n_values * sizeof (value_array->values[0]));
+  value_array->n_values = 0;
+  value_array->n_prealloced = 0;
+  value_array->values = NULL;
+  value_array_grow (value_array, n_prealloced, TRUE);
+  value_array->n_values = 0;
 
   return value_array;
 }
@@ -76,10 +116,11 @@ g_value_array_copy (const GValueArray *value_array)
 
   g_return_val_if_fail (value_array != NULL, NULL);
 
-  new_array = g_new0 (GValueArray, 1);
-  new_array->n_values = value_array->n_values;
-  new_array->values = g_renew (GValue, new_array->values, new_array->n_values);
-  memset (new_array->values, 0, new_array->n_values * sizeof (new_array->values[0]));
+  new_array = g_new (GValueArray, 1);
+  new_array->n_values = 0;
+  new_array->values = NULL;
+  new_array->n_prealloced = 0;
+  value_array_grow (new_array, value_array->n_values, TRUE);
   for (i = 0; i < new_array->n_values; i++)
     if (G_VALUE_TYPE (value_array->values + i) != 0)
       {
@@ -121,8 +162,8 @@ g_value_array_insert (GValueArray  *value_array,
 
   /* we support NULL for "value" as a shortcut for an unset value */
 
-  i = value_array->n_values++;
-  value_array->values = g_renew (GValue, value_array->values, value_array->n_values);
+  i = value_array->n_values;
+  value_array_grow (value_array, value_array->n_values + 1, FALSE);
   if (index + 1 < value_array->n_values)
     g_memmove (value_array->values + index + 1, value_array->values + index,
 	       (i - index) * sizeof (value_array->values[0]));
@@ -148,7 +189,9 @@ g_value_array_remove (GValueArray *value_array,
   if (index < value_array->n_values)
     g_memmove (value_array->values + index, value_array->values + index + 1,
 	       (value_array->n_values - index) * sizeof (value_array->values[0]));
-  value_array->values = g_renew (GValue, value_array->values, value_array->n_values);
+  value_array_shrink (value_array);
+  if (value_array->n_prealloced > value_array->n_values)
+    memset (value_array->values + value_array->n_values, 0, sizeof (value_array->values[0]));
 
   return value_array;
 }