[glib] Add a method to get the pspec name quark

[Matthias Clasen <matthiasc src gnome org>]

commit 41c0d15a6d680738e80a59e89c1058a97ca922ea
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 7 20:54:01 2015 -0400

    Add a method to get the pspec name quark
    
    This lets us avoid the quark lookup in the hot
    property change notification path.

 docs/reference/gobject/gobject-sections.txt |    1 +
 gobject/gparam.c                            |   34 ++++++++++++++++++++++++--
 gobject/gparam.h                            |    3 ++
 3 files changed, 35 insertions(+), 3 deletions(-)
---
diff --git a/docs/reference/gobject/gobject-sections.txt b/docs/reference/gobject/gobject-sections.txt
index ad31c23..b9f26c9 100644
--- a/docs/reference/gobject/gobject-sections.txt
+++ b/docs/reference/gobject/gobject-sections.txt
@@ -513,6 +513,7 @@ g_param_value_validate
 g_param_value_convert
 g_param_values_cmp
 g_param_spec_get_name
+g_param_spec_get_name_quark
 g_param_spec_get_nick
 g_param_spec_get_blurb
 g_param_spec_get_qdata
diff --git a/gobject/gparam.c b/gobject/gparam.c
index ec86766..681e1bf 100644
--- a/gobject/gparam.c
+++ b/gobject/gparam.c
@@ -81,6 +81,7 @@ static gchar* value_param_lcopy_value         (const GValue   *value,
 typedef struct
 {
   GValue default_value;
+  GQuark name_quark;
 } GParamSpecPrivate;
 
 static gint g_param_private_offset;
@@ -426,6 +427,7 @@ g_param_spec_internal (GType        param_type,
                       GParamFlags  flags)
 {
   GParamSpec *pspec;
+  GParamSpecPrivate *priv;
   
   g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
   g_return_val_if_fail (name != NULL, NULL);
@@ -454,6 +456,9 @@ g_param_spec_internal (GType        param_type,
         }
     }
 
+  priv = g_param_spec_get_private (pspec);
+  priv->name_quark = g_quark_from_string (pspec->name);
+
   if (flags & G_PARAM_STATIC_NICK)
     pspec->_nick = (gchar*) nick;
   else
@@ -1520,11 +1525,11 @@ g_value_dup_param (const GValue *value)
 
 /**
  * g_param_spec_get_default_value:
- * @param: a #GParamSpec
+ * @pspec: a #GParamSpec
  *
- * Gets the default value of @param as a pointer to a #GValue.
+ * Gets the default value of @pspec as a pointer to a #GValue.
  *
- * The #GValue will remain value for the life of @param.
+ * The #GValue will remain value for the life of @pspec.
  *
  * Returns: a pointer to a #GValue which must not be modified
  *
@@ -1564,3 +1569,26 @@ g_param_spec_get_default_value (GParamSpec *pspec)
 
   return &priv->default_value;
 }
+
+/**
+ * g_param_spec_get_name_quark:
+ * @param: a #GParamSpec
+ *
+ * Gets the GQuark for the name.
+ *
+ * Returns: the GQuark for @pspec->name.
+ *
+ * Since: 2.38
+ */
+GQuark
+g_param_spec_get_name_quark (GParamSpec *pspec)
+{
+  GParamSpecPrivate *priv = g_param_spec_get_private (pspec);
+
+  /* Return the quark that we've stashed away at creation time.
+   * This lets us avoid a lock and a hash table lookup when
+   * dispatching property change notification.
+   */
+
+  return priv->name_quark;
+}
diff --git a/gobject/gparam.h b/gobject/gparam.h
index 88b18fd..612624c 100644
--- a/gobject/gparam.h
+++ b/gobject/gparam.h
@@ -343,6 +343,9 @@ void           g_value_set_param_take_ownership (GValue        *value,
 GLIB_AVAILABLE_IN_2_36
 const GValue *  g_param_spec_get_default_value  (GParamSpec     *param);
 
+GLIB_AVAILABLE_IN_2_46
+GQuark          g_param_spec_get_name_quark     (GParamSpec     *param);
+
 /* --- convenience functions --- */
 typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo;
 /**