Changeset 6f7cd5d in mainline for uspace/srv/hid/remcons/remcons.c

Timestamp:

2012-01-09T18:05:37Z (13 years ago)

Author:

Vojtech Horky <vojtechhorky@…>

Branches:

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

Children:

3806317

Parents:

5576358

Message:

remcons: safer wrt. fibrils

File:

• uspace/srv/hid/remcons/remcons.c (modified) (6 diffs)

uspace/srv/hid/remcons/remcons.c

@@ -74 +74 @@
         size_t socket_buffer_len;
         size_t socket_buffer_pos;
+
+        /* Destruction CV with guard. */
+        int refcount;
+        fibril_condvar_t refcount_cv;
+        fibril_mutex_t refcount_mutex;
 } client_t;
 
@@ -103 +108 @@
         client->socket_buffer_pos = 0;
 
+        fibril_condvar_initialize(&client->refcount_cv);
+        fibril_mutex_initialize(&client->refcount_mutex);
+        client->refcount = 0;
+
 
         fibril_mutex_lock(&clients_guard);
@@ -154 +163 @@
 }
 
-static void client_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
-{
-        /* Find the client. */
-        client_t *client = client_find(IPC_GET_ARG1(*icall));
-        if (client == NULL) {
-                async_answer_0(iid, ENOENT);
-                return;
-        }
-
-        printf("New client for service %s.\n", client->service_name);
-
-        /* Accept the connection */
-        async_answer_0(iid, EOK);
-
-        /*
-         * Force character mode.
-         * IAC WILL ECHO IAC WILL SUPPRESS_GO_AHEAD IAC WONT LINEMODE
-         * http://stackoverflow.com/questions/273261/force-telnet-client-into-character-mode
-         */
-        const char force_char_mode[] = {255, 251, 1, 255, 251, 3, 255, 252, 34};
-        send(client->socket, (void *)force_char_mode, sizeof(force_char_mode), 0);
-
+static void client_connection_message_loop(client_t *client)
+{
         while (true) {
                 ipc_call_t call;
@@ -302 +291 @@
 }
 
+static void client_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+        /* Find the client. */
+        client_t *client = client_find(IPC_GET_ARG1(*icall));
+        if (client == NULL) {
+                async_answer_0(iid, ENOENT);
+                return;
+        }
+
+        printf("New client for service %s.\n", client->service_name);
+
+        /* Accept the connection, increment reference. */
+        async_answer_0(iid, EOK);
+        fibril_mutex_lock(&client->refcount_mutex);
+        client->refcount++;
+        fibril_mutex_unlock(&client->refcount_mutex);
+
+        /*
+         * Force character mode.
+         * IAC WILL ECHO IAC WILL SUPPRESS_GO_AHEAD IAC WONT LINEMODE
+         * http://stackoverflow.com/questions/273261/force-telnet-client-into-character-mode
+         */
+        const char force_char_mode[] = {255, 251, 1, 255, 251, 3, 255, 252, 34};
+        send(client->socket, (void *)force_char_mode, sizeof(force_char_mode), 0);
+
+        client_connection_message_loop(client);
+
+        /* Announce client disconnection. */
+        fibril_mutex_lock(&client->refcount_mutex);
+        client->refcount--;
+        fibril_condvar_signal(&client->refcount_cv);
+        fibril_mutex_unlock(&client->refcount_mutex);
+}
+
 
 static int network_client_fibril(void *arg)
@@ -327 +350 @@
                 return EOK;
         }
+        fibril_mutex_lock(&client->refcount_mutex);
+        client->refcount++;
+        fibril_mutex_unlock(&client->refcount_mutex);
 
         task_exit_t task_exit;
@@ -334 +360 @@
 
         closesocket(client->socket);
+        rc = loc_service_unregister(client->service_id);
+        if (rc != EOK) {
+                fprintf(stderr, "Warning: failed to unregister %s: %s\n", client->service_name, str_error(rc));
+        }
+
+        /* Wait for all clients to exit. */
+        fibril_mutex_lock(&client->refcount_mutex);
+        /* Drop our reference. */
+        client->refcount--;
+        while (client->refcount > 0) {
+                fibril_condvar_wait(&client->refcount_cv, &client->refcount_mutex);
+        }
+        fibril_mutex_unlock(&client->refcount_mutex);
 
         client_destroy(client);