Changeset 12f9f0d0 in mainline for uspace/srv/loc/loc.c

Timestamp:

2011-08-17T13:39:53Z (14 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e280857

Parents:

45058baa

Message:

Notifications on changes in loc categories. Limitations:

• cannot specify single category to watch
• max one task can register notifications with loc service
• max one user callback function can be registered with C library

Remove devman tests as they are not applicable anymore.

File:

• uspace/srv/loc/loc.c (modified) (4 diffs)

uspace/srv/loc/loc.c

@@ -84 +84 @@
 /** Service directory ogranized by categories (yellow pages) */
 static categ_dir_t cdir;
+
+static FIBRIL_MUTEX_INITIALIZE(callback_sess_mutex);
+static async_sess_t *callback_sess = NULL;
 
 service_id_t loc_create_id(void)
@@ -728 +731 @@
  *
  */
+static void loc_callback_create(ipc_callid_t iid, ipc_call_t *icall)
+{
+        async_sess_t *cb_sess = async_callback_receive(EXCHANGE_SERIALIZE);
+        if (cb_sess == NULL) {
+                async_answer_0(iid, ENOMEM);
+                return;
+        }
+        
+        fibril_mutex_lock(&callback_sess_mutex);
+        if (callback_sess != NULL) {
+                fibril_mutex_unlock(&callback_sess_mutex);
+                async_answer_0(iid, EEXIST);
+                return;
+        }
+        
+        callback_sess = cb_sess;
+        fibril_mutex_unlock(&callback_sess_mutex);
+        
+        async_answer_0(iid, EOK);
+}
+
+void loc_category_change_event(void)
+{
+        fibril_mutex_lock(&callback_sess_mutex);
+
+        if (callback_sess != NULL) {
+                async_exch_t *exch = async_exchange_begin(callback_sess);
+                async_msg_0(exch, LOC_EVENT_CAT_CHANGE);
+                async_exchange_end(exch);
+        }
+
+        fibril_mutex_unlock(&callback_sess_mutex);
+}
+
+/** Find ID for category specified by name.
+ *
+ * On success, answer will contain EOK int retval and service ID in arg1.
+ * On failure, error code will be sent in retval.
+ *
+ */
 static void loc_category_get_id(ipc_callid_t iid, ipc_call_t *icall)
 {
@@ -1129 +1172 @@
 
         async_answer_0(iid, retval);
+
+        loc_category_change_event();
 }
 
@@ -1243 +1288 @@
                 case LOC_NAMESPACE_GET_ID:
                         loc_namespace_get_id(callid, &call);
+                        break;
+                case LOC_CALLBACK_CREATE:
+                        loc_callback_create(callid, &call);
                         break;
                 case LOC_CATEGORY_GET_ID: