X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fconsumer.c;h=8d897e5df1e20e20c67ddbc6ed8f99af7e7de2aa;hb=0b5fb04901c0ac733559b406d40c340ea821fcf0;hp=0f0e60ad839a9beab57168634a8d7220a86fae62;hpb=3cc2f24a5cdabfbcb1022c0798f6b4845f72b498;p=lttng-tools.git

diff --git a/src/common/consumer.c b/src/common/consumer.c
index 0f0e60ad8..8d897e5df 100644
--- a/src/common/consumer.c
+++ b/src/common/consumer.c
@@ -281,6 +281,11 @@ void consumer_del_stream(struct lttng_consumer_stream *stream,
 	iter.iter.node = &stream->node.node;
 	ret = lttng_ht_del(ht, &iter);
 	assert(!ret);
+
+	/* Remove node session id from the consumer_data stream ht */
+	iter.iter.node = &stream->node_session_id.node;
+	ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
+	assert(!ret);
 	rcu_read_unlock();
 
 	assert(consumer_data.stream_count > 0);
@@ -364,6 +369,7 @@ struct lttng_consumer_stream *consumer_allocate_stream(
 		gid_t gid,
 		int net_index,
 		int metadata_flag,
+		uint64_t session_id,
 		int *alloc_ret)
 {
 	struct lttng_consumer_stream *stream;
@@ -399,8 +405,10 @@ struct lttng_consumer_stream *consumer_allocate_stream(
 	stream->gid = gid;
 	stream->net_seq_idx = net_index;
 	stream->metadata_flag = metadata_flag;
+	stream->session_id = session_id;
 	strncpy(stream->path_name, path_name, sizeof(stream->path_name));
 	stream->path_name[sizeof(stream->path_name) - 1] = '\0';
+	pthread_mutex_init(&stream->lock, NULL);
 
 	/*
 	 * Index differently the metadata node because the thread is using an
@@ -413,6 +421,9 @@ struct lttng_consumer_stream *consumer_allocate_stream(
 		lttng_ht_node_init_ulong(&stream->node, stream->key);
 	}
 
+	/* Init session id node with the stream session id */
+	lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id);
+
 	/*
 	 * The cpu number is needed before using any ustctl_* actions. Ignored for
 	 * the kernel so the value does not matter.
@@ -422,10 +433,10 @@ struct lttng_consumer_stream *consumer_allocate_stream(
 	pthread_mutex_unlock(&consumer_data.lock);
 
 	DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu,"
-			" out_fd %d, net_seq_idx %d)", stream->path_name, stream->key,
-			stream->shm_fd, stream->wait_fd,
+			" out_fd %d, net_seq_idx %d, session_id %" PRIu64,
+			stream->path_name, stream->key, stream->shm_fd, stream->wait_fd,
 			(unsigned long long) stream->mmap_len, stream->out_fd,
-			stream->net_seq_idx);
+			stream->net_seq_idx, stream->session_id);
 	return stream;
 
 error:
@@ -456,6 +467,13 @@ static int consumer_add_stream(struct lttng_consumer_stream *stream,
 
 	lttng_ht_add_unique_ulong(ht, &stream->node);
 
+	/*
+	 * Add stream to the stream_list_ht of the consumer data. No need to steal
+	 * the key since the HT does not use it and we allow to add redundant keys
+	 * into this table.
+	 */
+	lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
+
 	/* Check and cleanup relayd */
 	relayd = consumer_find_relayd(stream->net_seq_idx);
 	if (relayd != NULL) {
@@ -1151,6 +1169,8 @@ ssize_t lttng_consumer_on_read_subbuffer_mmap(
 	/* RCU lock for the relayd pointer */
 	rcu_read_lock();
 
+	pthread_mutex_lock(&stream->lock);
+
 	/* Flag that the current stream if set for network streaming. */
 	if (stream->net_seq_idx != -1) {
 		relayd = consumer_find_relayd(stream->net_seq_idx);
@@ -1246,6 +1266,7 @@ ssize_t lttng_consumer_on_read_subbuffer_mmap(
 	lttng_consumer_sync_trace_file(stream, orig_offset);
 
 end:
+	pthread_mutex_unlock(&stream->lock);
 	/* Unlock only if ctrl socket used */
 	if (relayd && stream->metadata_flag) {
 		pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
@@ -1289,6 +1310,8 @@ ssize_t lttng_consumer_on_read_subbuffer_splice(
 	/* RCU lock for the relayd pointer */
 	rcu_read_lock();
 
+	pthread_mutex_lock(&stream->lock);
+
 	/* Flag that the current stream if set for network streaming. */
 	if (stream->net_seq_idx != -1) {
 		relayd = consumer_find_relayd(stream->net_seq_idx);
@@ -1428,6 +1451,7 @@ splice_error:
 	}
 
 end:
+	pthread_mutex_unlock(&stream->lock);
 	if (relayd && stream->metadata_flag) {
 		pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
 	}
@@ -1600,6 +1624,11 @@ void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
 	iter.iter.node = &stream->node.node;
 	ret = lttng_ht_del(ht, &iter);
 	assert(!ret);
+
+	/* Remove node session id from the consumer_data stream ht */
+	iter.iter.node = &stream->node_session_id.node;
+	ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
+	assert(!ret);
 	rcu_read_unlock();
 
 	if (stream->out_fd >= 0) {
@@ -1718,6 +1747,14 @@ static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream,
 	consumer_steal_stream_key(stream->key, ht);
 
 	lttng_ht_add_unique_ulong(ht, &stream->node);
+
+	/*
+	 * Add stream to the stream_list_ht of the consumer data. No need to steal
+	 * the key since the HT does not use it and we allow to add redundant keys
+	 * into this table.
+	 */
+	lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
+
 	rcu_read_unlock();
 
 	pthread_mutex_unlock(&consumer_data.lock);
@@ -2308,6 +2345,7 @@ void lttng_consumer_init(void)
 {
 	consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 	consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+	consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 
 	metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 	assert(metadata_ht);
@@ -2406,3 +2444,89 @@ int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
 error:
 	return ret;
 }
+
+/*
+ * Check if for a given session id there is still data needed to be extract
+ * from the buffers.
+ *
+ * Return 1 if data is in fact available to be read or else 0.
+ */
+int consumer_data_available(uint64_t id)
+{
+	int ret;
+	struct lttng_ht_iter iter;
+	struct lttng_ht *ht;
+	struct lttng_consumer_stream *stream;
+	struct consumer_relayd_sock_pair *relayd;
+	int (*data_available)(struct lttng_consumer_stream *);
+
+	DBG("Consumer data available command on session id %" PRIu64, id);
+
+	pthread_mutex_lock(&consumer_data.lock);
+
+	switch (consumer_data.type) {
+	case LTTNG_CONSUMER_KERNEL:
+		data_available = lttng_kconsumer_data_available;
+		break;
+	case LTTNG_CONSUMER32_UST:
+	case LTTNG_CONSUMER64_UST:
+		data_available = lttng_ustconsumer_data_available;
+		break;
+	default:
+		ERR("Unknown consumer data type");
+		assert(0);
+	}
+
+	rcu_read_lock();
+
+	/* Ease our life a bit */
+	ht = consumer_data.stream_list_ht;
+
+	cds_lfht_for_each_entry_duplicate(ht->ht,
+			ht->hash_fct((void *)((unsigned long) id), 0x42UL),
+			ht->match_fct, (void *)((unsigned long) id),
+			&iter.iter, stream, node_session_id.node) {
+		/* Check the stream for data. */
+		ret = data_available(stream);
+		if (ret == 0) {
+			goto data_not_available;
+		}
+
+		if (stream->net_seq_idx != -1) {
+			relayd = consumer_find_relayd(stream->net_seq_idx);
+			assert(relayd);
+
+			pthread_mutex_lock(&stream->lock);
+			pthread_mutex_lock(&relayd->ctrl_sock_mutex);
+			if (stream->metadata_flag) {
+				ret = relayd_quiescent_control(&relayd->control_sock);
+			} else {
+				ret = relayd_data_available(&relayd->control_sock,
+						stream->relayd_stream_id, stream->next_net_seq_num);
+			}
+			pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+			pthread_mutex_unlock(&stream->lock);
+			if (ret == 0) {
+				goto data_not_available;
+			}
+		}
+	}
+
+	/*
+	 * Finding _no_ node in the hash table means that the stream(s) have been
+	 * removed thus data is guaranteed to be available for analysis from the
+	 * trace files. This is *only* true for local consumer and not network
+	 * streaming.
+	 */
+
+	/* Data is available to be read by a viewer. */
+	pthread_mutex_unlock(&consumer_data.lock);
+	rcu_read_unlock();
+	return 1;
+
+data_not_available:
+	/* Data is still being extracted from buffers. */
+	pthread_mutex_unlock(&consumer_data.lock);
+	rcu_read_unlock();
+	return 0;
+}