Changeset 12f9f0d0 in mainline for uspace/lib/c/generic/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/lib/c/generic/loc.c (modified) (4 diffs)

uspace/lib/c/generic/loc.c

@@ -45 +45 @@
 static FIBRIL_MUTEX_INITIALIZE(loc_consumer_mutex);
 
+static FIBRIL_MUTEX_INITIALIZE(loc_callback_mutex);
+static bool loc_callback_created = false;
+
 static async_sess_t *loc_supp_block_sess = NULL;
 static async_sess_t *loc_cons_block_sess = NULL;
@@ -51 +54 @@
 static async_sess_t *loc_consumer_sess = NULL;
 
+static loc_cat_change_cb_t cat_change_cb = NULL;
+
+static void loc_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+        loc_cat_change_cb_t cb_fun;
+        
+        while (true) {
+                ipc_call_t call;
+                ipc_callid_t callid = async_get_call(&call);
+                
+                if (!IPC_GET_IMETHOD(call)) {
+                        /* TODO: Handle hangup */
+                        return;
+                }
+                
+                int retval;
+                
+                switch (IPC_GET_IMETHOD(call)) {
+                case LOC_EVENT_CAT_CHANGE:
+                        fibril_mutex_lock(&loc_callback_mutex);
+                        cb_fun = cat_change_cb;
+                        if (cb_fun != NULL) {
+                                (*cb_fun)();
+                        }
+                        fibril_mutex_unlock(&loc_callback_mutex);
+                        retval = 0;
+                        break;
+                default:
+                        retval = ENOTSUP;
+                }
+                
+                async_answer_0(callid, retval);
+        }
+}
+
+
 static void clone_session(fibril_mutex_t *mtx, async_sess_t *src,
     async_sess_t **dst)
@@ -60 +99 @@
         
         fibril_mutex_unlock(mtx);
+}
+
+static int loc_callback_create(void)
+{
+        async_exch_t *exch;
+        sysarg_t retval;
+        int rc = EOK;
+
+        fibril_mutex_lock(&loc_callback_mutex);
+        
+        if (!loc_callback_created) {
+                exch = loc_exchange_begin_blocking(LOC_PORT_CONSUMER);
+                
+                ipc_call_t answer;
+                aid_t req = async_send_0(exch, LOC_CALLBACK_CREATE, &answer);
+                async_connect_to_me(exch, 0, 0, 0, loc_cb_conn, NULL);
+                loc_exchange_end(exch);
+                
+                async_wait_for(req, &retval);
+                if (rc != EOK)
+                        goto done;
+                
+                if (retval != EOK) {
+                        rc = retval;
+                        goto done;
+                }
+                
+                loc_callback_created = true;
+        }
+        
+        rc = EOK;
+done:
+        fibril_mutex_unlock(&loc_callback_mutex);
+        return rc;
 }
 
@@ -749 +822 @@
             data, count);
 }
+
+int loc_register_cat_change_cb(loc_cat_change_cb_t cb_fun)
+{
+        if (loc_callback_create() != EOK)
+                return EIO;
+
+        cat_change_cb = cb_fun;
+        return EOK;
+}