X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=src%2Fcommon%2Fconsumer%2Fconsumer.c;h=73ccbf6bd3b316e4606dd2acaeb628819099a3f7;hb=2afa177e790cc3223abe9f1a591536017270e0ab;hp=e379171ae3df53ff46dbfb5ec6347aac687e396c;hpb=3dad2c0ff117979532095b6bd83f59bf32a519d7;p=lttng-tools.git

diff --git a/src/common/consumer/consumer.c b/src/common/consumer/consumer.c
index e379171ae..73ccbf6bd 100644
--- a/src/common/consumer/consumer.c
+++ b/src/common/consumer/consumer.c
@@ -67,13 +67,16 @@ struct consumer_channel_msg {
 	uint64_t key;				/* del */
 };
 
+/* Flag used to temporarily pause data consumption from testpoints. */
+int data_consumption_paused;
+
 /*
  * Flag to inform the polling thread to quit when all fd hung up. Updated by
  * the consumer_thread_receive_fds when it notices that all fds has hung up.
  * Also updated by the signal handler (consumer_should_exit()). Read by the
  * polling threads.
  */
-volatile int consumer_quit;
+int consumer_quit;
 
 /*
  * Global hash table containing respectively metadata and data streams. The
@@ -368,6 +371,9 @@ void consumer_del_channel(struct lttng_consumer_channel *channel)
 	if (channel->live_timer_enabled == 1) {
 		consumer_timer_live_stop(channel);
 	}
+	if (channel->monitor_timer_enabled == 1) {
+		consumer_timer_monitor_stop(channel);
+	}
 
 	switch (consumer_data.type) {
 	case LTTNG_CONSUMER_KERNEL:
@@ -1071,7 +1077,7 @@ int consumer_add_channel(struct lttng_consumer_channel *channel,
  */
 static int update_poll_array(struct lttng_consumer_local_data *ctx,
 		struct pollfd **pollfd, struct lttng_consumer_stream **local_stream,
-		struct lttng_ht *ht)
+		struct lttng_ht *ht, int *nb_inactive_fd)
 {
 	int i = 0;
 	struct lttng_ht_iter iter;
@@ -1083,6 +1089,7 @@ static int update_poll_array(struct lttng_consumer_local_data *ctx,
 	assert(local_stream);
 
 	DBG("Updating poll fd array");
+	*nb_inactive_fd = 0;
 	rcu_read_lock();
 	cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
 		/*
@@ -1093,9 +1100,14 @@ static int update_poll_array(struct lttng_consumer_local_data *ctx,
 		 * just after the check. However, this is OK since the stream(s) will
 		 * be deleted once the thread is notified that the end point state has
 		 * changed where this function will be called back again.
+		 *
+		 * We track the number of inactive FDs because they still need to be
+		 * closed by the polling thread after a wakeup on the data_pipe or
+		 * metadata_pipe.
 		 */
 		if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM ||
 				stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) {
+			(*nb_inactive_fd)++;
 			continue;
 		}
 		/*
@@ -1221,7 +1233,7 @@ void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
 {
 	ssize_t ret;
 
-	consumer_quit = 1;
+	CMM_STORE_SHARED(consumer_quit, 1);
 	ret = lttng_write(ctx->consumer_should_quit[1], "4", 1);
 	if (ret < 1) {
 		PERROR("write consumer quit");
@@ -1348,6 +1360,8 @@ struct lttng_consumer_local_data *lttng_consumer_create(
 		goto error_metadata_pipe;
 	}
 
+	ctx->channel_monitor_pipe = -1;
+
 	return ctx;
 
 error_metadata_pipe:
@@ -2449,6 +2463,8 @@ void *consumer_thread_data_poll(void *data)
 	struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL;
 	/* local view of consumer_data.fds_count */
 	int nb_fd = 0;
+	/* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */
+	int nb_inactive_fd = 0;
 	struct lttng_consumer_local_data *ctx = data;
 	ssize_t len;
 
@@ -2505,7 +2521,7 @@ void *consumer_thread_data_poll(void *data)
 				goto end;
 			}
 			ret = update_poll_array(ctx, &pollfd, local_stream,
-					data_ht);
+					data_ht, &nb_inactive_fd);
 			if (ret < 0) {
 				ERR("Error in allocating pollfd or local_outfds");
 				lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
@@ -2518,13 +2534,17 @@ void *consumer_thread_data_poll(void *data)
 		pthread_mutex_unlock(&consumer_data.lock);
 
 		/* No FDs and consumer_quit, consumer_cleanup the thread */
-		if (nb_fd == 0 && consumer_quit == 1) {
+		if (nb_fd == 0 && nb_inactive_fd == 0 &&
+				CMM_LOAD_SHARED(consumer_quit) == 1) {
 			err = 0;	/* All is OK */
 			goto end;
 		}
 		/* poll on the array of fds */
 	restart:
 		DBG("polling on %d fd", nb_fd + 2);
+		if (testpoint(consumerd_thread_data_poll)) {
+			goto end;
+		}
 		health_poll_entry();
 		num_rdy = poll(pollfd, nb_fd + 2, -1);
 		health_poll_exit();
@@ -2544,6 +2564,12 @@ void *consumer_thread_data_poll(void *data)
 			goto end;
 		}
 
+		if (caa_unlikely(data_consumption_paused)) {
+			DBG("Data consumption paused, sleeping...");
+			sleep(1);
+			goto restart;
+		}
+
 		/*
 		 * If the consumer_data_pipe triggered poll go directly to the
 		 * beginning of the loop to update the array. We want to prioritize
@@ -3186,7 +3212,7 @@ void *consumer_thread_sessiond_poll(void *data)
 			err = 0;
 			goto end;
 		}
-		if (consumer_quit) {
+		if (CMM_LOAD_SHARED(consumer_quit)) {
 			DBG("consumer_thread_receive_fds received quit from signal");
 			err = 0;	/* All is OK */
 			goto end;
@@ -3211,7 +3237,7 @@ end:
 	 * when all fds have hung up, the polling thread
 	 * can exit cleanly
 	 */
-	consumer_quit = 1;
+	CMM_STORE_SHARED(consumer_quit, 1);
 
 	/*
 	 * Notify the data poll thread to poll back again and test the
@@ -3343,7 +3369,7 @@ error:
  * This will create a relayd socket pair and add it to the relayd hash table.
  * The caller MUST acquire a RCU read side lock before calling it.
  */
-int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
+ void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 		struct lttng_consumer_local_data *ctx, int sock,
 		struct pollfd *consumer_sockpoll,
 		struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id,
@@ -3365,7 +3391,6 @@ int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 		/* Not found. Allocate one. */
 		relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
 		if (relayd == NULL) {
-			ret = -ENOMEM;
 			ret_code = LTTCOMM_CONSUMERD_ENOMEM;
 			goto error;
 		} else {
@@ -3398,14 +3423,12 @@ int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 	if (ret) {
 		/* Needing to exit in the middle of a command: error. */
 		lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
-		ret = -EINTR;
 		goto error_nosignal;
 	}
 
 	/* Get relayd socket from session daemon */
 	ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
 	if (ret != sizeof(fd)) {
-		ret = -1;
 		fd = -1;	/* Just in case it gets set with an invalid value. */
 
 		/*
@@ -3479,7 +3502,6 @@ int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 		break;
 	default:
 		ERR("Unknown relayd socket type (%d)", sock_type);
-		ret = -1;
 		ret_code = LTTCOMM_CONSUMERD_FATAL;
 		goto error;
 	}
@@ -3503,7 +3525,7 @@ int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
 	add_relayd(relayd);
 
 	/* All good! */
-	return 0;
+	return;
 
 error:
 	if (consumer_send_status_msg(sock, ret_code) < 0) {
@@ -3521,8 +3543,6 @@ error_nosignal:
 	if (relayd_created) {
 		free(relayd);
 	}
-
-	return ret;
 }
 
 /*