[PATCH V2 1/5] bluetooth: Add reference count for bluetooth utils

[Zhenhua Zhang]

Add bluetooth_ref()/bluetooth_unref() to support reference count in
bluetooth utils.
---
 plugins/bluetooth.c |   62 +++++++++++++++++++++++++++++++++++++--------------
 1 files changed, 45 insertions(+), 17 deletions(-)

diff --git a/plugins/bluetooth.c b/plugins/bluetooth.c
index 5a85eaa..10cc49d 100644
--- a/plugins/bluetooth.c
+++ b/plugins/bluetooth.c
@@ -39,6 +39,7 @@
 static DBusConnection *connection;
 static GHashTable *uuid_hash = NULL;
 static GHashTable *adapter_address_hash = NULL;
+static gint ref_count;
 
 void bluetooth_create_path(const char *dev_addr, const char *adapter_addr,
                                char *buf, int size)
@@ -503,13 +504,10 @@ static guint adapter_added_watch;
 static guint adapter_removed_watch;
 static guint property_watch;
 
-int bluetooth_register_uuid(const char *uuid, struct bluetooth_profile 
*profile)
+static int bluetooth_init()
 {
        int err;
 
-       if (uuid_hash)
-               goto done;
-
        connection = ofono_dbus_get_connection();
 
        bluetooth_watch = g_dbus_add_service_watch(connection, BLUEZ_SERVICE,
@@ -542,13 +540,6 @@ int bluetooth_register_uuid(const char *uuid, struct 
bluetooth_profile *profile)
        adapter_address_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
                                                g_free, g_free);
 
-done:
-       g_hash_table_insert(uuid_hash, g_strdup(uuid), profile);
-
-       bluetooth_send_with_reply("/", BLUEZ_MANAGER_INTERFACE, "GetProperties",
-                               manager_properties_cb, NULL, NULL, -1,
-                               DBUS_TYPE_INVALID);
-
        return 0;
 
 remove:
@@ -556,14 +547,27 @@ remove:
        g_dbus_remove_watch(connection, adapter_added_watch);
        g_dbus_remove_watch(connection, adapter_removed_watch);
        g_dbus_remove_watch(connection, property_watch);
+
        return err;
 }
 
-void bluetooth_unregister_uuid(const char *uuid)
+static int bluetooth_ref()
 {
-       g_hash_table_remove(uuid_hash, uuid);
+       g_atomic_int_inc(&ref_count);
+
+       if (ref_count > 1)
+               return 0;
+
+       return bluetooth_init();
+}
+
+static void bluetooth_unref()
+{
+       gboolean is_zero;
+
+       is_zero = g_atomic_int_dec_and_test(&ref_count);
 
-       if (g_hash_table_size(uuid_hash))
+       if (is_zero == FALSE)
                return;
 
        g_dbus_remove_watch(connection, bluetooth_watch);
@@ -571,9 +575,33 @@ void bluetooth_unregister_uuid(const char *uuid)
        g_dbus_remove_watch(connection, adapter_removed_watch);
        g_dbus_remove_watch(connection, property_watch);
 
-       g_hash_table_destroy(uuid_hash);
-       g_hash_table_destroy(adapter_address_hash);
-       uuid_hash = NULL;
+       if (uuid_hash)
+               g_hash_table_destroy(uuid_hash);
+
+       if (adapter_address_hash)
+               g_hash_table_destroy(adapter_address_hash);
+}
+
+int bluetooth_register_uuid(const char *uuid, struct bluetooth_profile 
*profile)
+{
+       int err = bluetooth_ref();
+
+       if (err != 0)
+               return err;
+
+       g_hash_table_insert(uuid_hash, g_strdup(uuid), profile);
+
+       bluetooth_send_with_reply("/", BLUEZ_MANAGER_INTERFACE, "GetProperties",
+                               manager_properties_cb, NULL, NULL, -1,
+                               DBUS_TYPE_INVALID);
+       return 0;
+}
+
+void bluetooth_unregister_uuid(const char *uuid)
+{
+       g_hash_table_remove(uuid_hash, uuid);
+
+       bluetooth_unref();
 }
 
 OFONO_PLUGIN_DEFINE(bluetooth, "Bluetooth Utils Plugins", VERSION,
-- 
1.7.0.4

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