X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Flive.c;h=562a7fa522017ae4126d2d7b76847fbed9f81dc6;hb=d77dded285b058e4242c8a3d2233f80e725ceefc;hp=beb67b2a5654ed54cc5ef36a75408c2d6b667364;hpb=178a055717baca3641cecbb45fe3c0d5d3286a3a;p=lttng-tools.git

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index beb67b2a5..562a7fa52 100644
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -326,42 +326,12 @@ error_unlock:
 	return ret;
 }
 
-/*
- * Write to writable pipe used to notify a thread.
- */
-static
-int notify_thread_pipe(int wpipe)
-{
-	ssize_t ret;
-
-	ret = lttng_write(wpipe, "!", 1);
-	if (ret < 1) {
-		PERROR("write poll pipe");
-	}
-
-	return (int) ret;
-}
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static
-int stop_threads(void)
+int relayd_live_stop(void)
 {
-	int ret, retval = 0;
-
-	/* Stopping all threads */
-	DBG("Terminating all live threads");
-	ret = notify_thread_pipe(thread_quit_pipe[1]);
-	if (ret < 0) {
-		ERR("write error on thread quit pipe");
-		retval = -1;
-	}
-
-	/* Dispatch thread */
+	/* Stop dispatch thread */
 	CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
 	futex_nto1_wake(&viewer_conn_queue.futex);
-	return retval;
+	return 0;
 }
 
 /*
@@ -518,6 +488,11 @@ restart:
 			revents = LTTNG_POLL_GETEV(&events, i);
 			pollfd = LTTNG_POLL_GETFD(&events, i);
 
+			if (!revents) {
+				/* No activity for this FD (poll implementation). */
+				continue;
+			}
+
 			/* Thread quit pipe has been closed. Killing thread. */
 			ret = check_thread_quit_pipe(pollfd, revents);
 			if (ret) {
@@ -593,8 +568,8 @@ error_sock_control:
 	}
 	health_unregister(health_relayd);
 	DBG("Live viewer listener thread cleanup complete");
-	if (stop_threads()) {
-		ERR("Error stopping live threads");
+	if (lttng_relay_stop_threads()) {
+		ERR("Error stopping threads");
 	}
 	return NULL;
 }
@@ -672,8 +647,8 @@ error_testpoint:
 	}
 	health_unregister(health_relayd);
 	DBG("Live viewer dispatch thread dying");
-	if (stop_threads()) {
-		ERR("Error stopping live threads");
+	if (lttng_relay_stop_threads()) {
+		ERR("Error stopping threads");
 	}
 	return NULL;
 }
@@ -737,7 +712,12 @@ int viewer_connect(struct relay_connection *conn)
 	reply.major = htobe32(reply.major);
 	reply.minor = htobe32(reply.minor);
 	if (conn->type == RELAY_VIEWER_COMMAND) {
-		reply.viewer_session_id = htobe64(++last_relay_viewer_session_id);
+		/*
+		 * Increment outside of htobe64 macro, because can be used more than once
+		 * within the macro, and thus the operation may be undefined.
+		 */
+		last_relay_viewer_session_id++;
+		reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
 	}
 
 	health_code_update();
@@ -1883,13 +1863,13 @@ void *thread_worker(void *data)
 {
 	int ret, err = -1;
 	uint32_t nb_fd;
-	struct relay_connection *conn;
 	struct lttng_poll_event events;
 	struct lttng_ht *relay_connections_ht;
 	struct lttng_ht_iter iter;
 	struct lttng_viewer_cmd recv_hdr;
 	struct relay_local_data *relay_ctx = (struct relay_local_data *) data;
 	struct lttng_ht *sessions_ht = relay_ctx->sessions_ht;
+	struct relay_connection *destroy_conn;
 
 	DBG("[thread] Live viewer relay worker started");
 
@@ -1952,6 +1932,11 @@ restart:
 
 			health_code_update();
 
+			if (!revents) {
+				/* No activity for this FD (poll implementation). */
+				continue;
+			}
+
 			/* Thread quit pipe has been closed. Killing thread. */
 			ret = check_thread_quit_pipe(pollfd, revents);
 			if (ret) {
@@ -1965,6 +1950,8 @@ restart:
 					ERR("Relay live pipe error");
 					goto error;
 				} else if (revents & LPOLLIN) {
+					struct relay_connection *conn;
+
 					ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn));
 					if (ret < 0) {
 						goto error;
@@ -1980,6 +1967,8 @@ restart:
 					DBG("Connection socket %d added", conn->sock->fd);
 				}
 			} else {
+				struct relay_connection *conn;
+
 				rcu_read_lock();
 				conn = connection_find_by_sock(relay_connections_ht, pollfd);
 				/* If not found, there is a synchronization issue. */
@@ -2017,10 +2006,11 @@ error:
 
 	/* Cleanup reamaining connection object. */
 	rcu_read_lock();
-	cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, conn,
+	cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter,
+			destroy_conn,
 			sock_n.node) {
 		health_code_update();
-		destroy_connection(relay_connections_ht, conn);
+		destroy_connection(relay_connections_ht, destroy_conn);
 	}
 	rcu_read_unlock();
 error_poll_create:
@@ -2038,8 +2028,8 @@ error_testpoint:
 		ERR("Health error occurred in %s", __func__);
 	}
 	health_unregister(health_relayd);
-	if (stop_threads()) {
-		ERR("Error stopping live threads");
+	if (lttng_relay_stop_threads()) {
+		ERR("Error stopping threads");
 	}
 	rcu_unregister_thread();
 	return NULL;
@@ -2054,11 +2044,6 @@ static int create_conn_pipe(void)
 	return utils_create_pipe_cloexec(live_conn_pipe);
 }
 
-int relayd_live_stop(void)
-{
-	return stop_threads();
-}
-
 int relayd_live_join(void)
 {
 	int ret, retval = 0;
@@ -2127,7 +2112,10 @@ int relayd_live_create(struct lttng_uri *uri,
 	cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
 
 	/* Set up max poll set size */
-	lttng_poll_set_max_size();
+	if (lttng_poll_set_max_size()) {
+		retval = -1;
+		goto exit_init_data;
+	}
 
 	/* Setup the dispatcher thread */
 	ret = pthread_create(&live_dispatcher_thread, NULL,
@@ -2164,13 +2152,11 @@ int relayd_live_create(struct lttng_uri *uri,
 	 */
 	return retval;
 
+	/*
+	 * Join on the live_listener_thread should anything be added after
+	 * the live_listener thread's creation.
+	 */
 
-	ret = pthread_join(live_listener_thread, &status);
-	if (ret) {
-		errno = ret;
-		PERROR("pthread_join live listener");
-		retval = -1;
-	}
 exit_listener_thread:
 
 	ret = pthread_join(live_worker_thread, &status);