free(stream);
}
+static
+void consumer_free_metadata_stream(struct rcu_head *head)
+{
+ struct lttng_ht_node_ulong *node =
+ caa_container_of(head, struct lttng_ht_node_ulong, head);
+ struct lttng_consumer_stream *stream =
+ caa_container_of(node, struct lttng_consumer_stream, waitfd_node);
+
+ free(stream);
+}
+
/*
* RCU protected relayd socket pair free.
*/
* Remove a stream from the global list protected by a mutex. This
* function is also responsible for freeing its data structures.
*/
-void consumer_del_stream(struct lttng_consumer_stream *stream)
+void consumer_del_stream(struct lttng_consumer_stream *stream,
+ struct lttng_ht *ht)
{
int ret;
struct lttng_ht_iter iter;
assert(stream);
+ if (ht == NULL) {
+ /* Means the stream was allocated but not successfully added */
+ goto free_stream;
+ }
+
pthread_mutex_lock(&consumer_data.lock);
switch (consumer_data.type) {
rcu_read_lock();
iter.iter.node = &stream->node.node;
- ret = lttng_ht_del(consumer_data.stream_ht, &iter);
+ ret = lttng_ht_del(ht, &iter);
assert(!ret);
rcu_read_unlock();
free_chan = stream->chan;
}
- call_rcu(&stream->node.head, consumer_free_stream);
end:
consumer_data.need_update = 1;
pthread_mutex_unlock(&consumer_data.lock);
if (free_chan) {
consumer_del_channel(free_chan);
}
+
+free_stream:
+ call_rcu(&stream->node.head, consumer_free_stream);
}
struct lttng_consumer_stream *consumer_allocate_stream(
int *alloc_ret)
{
struct lttng_consumer_stream *stream;
- int ret;
stream = zmalloc(sizeof(*stream));
if (stream == NULL) {
ERR("Unable to find channel for stream %d", stream_key);
goto error;
}
- stream->chan->refcount++;
+
stream->key = stream_key;
stream->shm_fd = shm_fd;
stream->wait_fd = wait_fd;
stream->metadata_flag = metadata_flag;
strncpy(stream->path_name, path_name, sizeof(stream->path_name));
stream->path_name[sizeof(stream->path_name) - 1] = '\0';
- lttng_ht_node_init_ulong(&stream->node, stream->key);
lttng_ht_node_init_ulong(&stream->waitfd_node, stream->wait_fd);
-
- switch (consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- stream->cpu = stream->chan->cpucount++;
- ret = lttng_ustconsumer_allocate_stream(stream);
- if (ret) {
- *alloc_ret = -EINVAL;
- goto error;
- }
- break;
- default:
- ERR("Unknown consumer_data type");
- *alloc_ret = -EINVAL;
- goto error;
- }
-
- /*
- * When nb_init_streams reaches 0, we don't need to trigger any action in
- * terms of destroying the associated channel, because the action that
- * causes the count to become 0 also causes a stream to be added. The
- * channel deletion will thus be triggered by the following removal of this
- * stream.
- */
- if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
- uatomic_dec(&stream->chan->nb_init_streams);
- }
+ lttng_ht_node_init_ulong(&stream->node, stream->key);
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,
int consumer_add_stream(struct lttng_consumer_stream *stream)
{
int ret = 0;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter iter;
struct consumer_relayd_sock_pair *relayd;
- pthread_mutex_lock(&consumer_data.lock);
- /* Steal stream identifier, for UST */
- consumer_steal_stream_key(stream->key, consumer_data.stream_ht);
+ assert(stream);
+ DBG3("Adding consumer stream %d", stream->key);
+
+ pthread_mutex_lock(&consumer_data.lock);
rcu_read_lock();
- lttng_ht_lookup(consumer_data.stream_ht,
- (void *)((unsigned long) stream->key), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node != NULL) {
- rcu_read_unlock();
- /* Stream already exist. Ignore the insertion */
- goto end;
+
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ stream->cpu = stream->chan->cpucount++;
+ ret = lttng_ustconsumer_add_stream(stream);
+ if (ret) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /* Steal stream identifier only for UST */
+ consumer_steal_stream_key(stream->key, consumer_data.stream_ht);
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ assert(0);
+ ret = -ENOSYS;
+ goto error;
}
lttng_ht_add_unique_ulong(consumer_data.stream_ht, &stream->node);
if (relayd != NULL) {
uatomic_inc(&relayd->refcount);
}
- rcu_read_unlock();
- /* Update consumer data */
+ /* Update channel refcount once added without error(s). */
+ uatomic_inc(&stream->chan->refcount);
+
+ /*
+ * When nb_init_streams reaches 0, we don't need to trigger any action in
+ * terms of destroying the associated channel, because the action that
+ * causes the count to become 0 also causes a stream to be added. The
+ * channel deletion will thus be triggered by the following removal of this
+ * stream.
+ */
+ if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
+ uatomic_dec(&stream->chan->nb_init_streams);
+ }
+
+ /* Update consumer data once the node is inserted. */
consumer_data.stream_count++;
consumer_data.need_update = 1;
-end:
+error:
+ rcu_read_unlock();
pthread_mutex_unlock(&consumer_data.lock);
return ret;
node) {
struct lttng_consumer_stream *stream =
caa_container_of(node, struct lttng_consumer_stream, node);
- consumer_del_stream(stream);
+ consumer_del_stream(stream, consumer_data.stream_ht);
}
cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node,
/*
* Iterate over all streams of the hashtable and free them properly.
+ *
+ * XXX: Should not be only for metadata stream or else use an other name.
*/
static void destroy_stream_ht(struct lttng_ht *ht)
{
}
rcu_read_lock();
- cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
+ cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, waitfd_node.node) {
ret = lttng_ht_del(ht, &iter);
assert(!ret);
- call_rcu(&stream->node.head, consumer_free_stream);
+ call_rcu(&stream->waitfd_node.head, consumer_free_metadata_stream);
}
rcu_read_unlock();
/*
* Clean up a metadata stream and free its memory.
*/
-static void consumer_del_metadata_stream(struct lttng_consumer_stream *stream)
+void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
+ struct lttng_ht *ht)
{
int ret;
+ struct lttng_ht_iter iter;
+ struct lttng_consumer_channel *free_chan = NULL;
struct consumer_relayd_sock_pair *relayd;
assert(stream);
*/
assert(stream->metadata_flag);
+ DBG3("Consumer delete metadata stream %d", stream->wait_fd);
+
+ if (ht == NULL) {
+ /* Means the stream was allocated but not successfully added */
+ goto free_stream;
+ }
+
+ rcu_read_lock();
+ iter.iter.node = &stream->waitfd_node.node;
+ ret = lttng_ht_del(ht, &iter);
+ assert(!ret);
+ rcu_read_unlock();
+
pthread_mutex_lock(&consumer_data.lock);
switch (consumer_data.type) {
case LTTNG_CONSUMER_KERNEL:
default:
ERR("Unknown consumer_data type");
assert(0);
+ goto end;
}
- pthread_mutex_unlock(&consumer_data.lock);
if (stream->out_fd >= 0) {
ret = close(stream->out_fd);
if (!uatomic_read(&stream->chan->refcount)
&& !uatomic_read(&stream->chan->nb_init_streams)) {
/* Go for channel deletion! */
- consumer_del_channel(stream->chan);
+ free_chan = stream->chan;
}
- call_rcu(&stream->node.head, consumer_free_stream);
+end:
+ pthread_mutex_unlock(&consumer_data.lock);
+
+ if (free_chan) {
+ consumer_del_channel(free_chan);
+ }
+
+free_stream:
+ call_rcu(&stream->waitfd_node.head, consumer_free_metadata_stream);
}
/*
* Action done with the metadata stream when adding it to the consumer internal
* data structures to handle it.
*/
-static void consumer_add_metadata_stream(struct lttng_consumer_stream *stream)
+static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream,
+ struct lttng_ht *ht)
{
+ int ret = 0;
struct consumer_relayd_sock_pair *relayd;
- /* Find relayd and, if one is found, increment refcount. */
+ assert(stream);
+ assert(ht);
+
+ DBG3("Adding metadata stream %d to hash table", stream->wait_fd);
+
+ pthread_mutex_lock(&consumer_data.lock);
+
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ ret = lttng_ustconsumer_add_stream(stream);
+ if (ret) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /* Steal stream identifier only for UST */
+ consumer_steal_stream_key(stream->wait_fd, ht);
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ assert(0);
+ ret = -ENOSYS;
+ goto error;
+ }
+
+ /*
+ * From here, refcounts are updated so be _careful_ when returning an error
+ * after this point.
+ */
+
rcu_read_lock();
+ /* Find relayd and, if one is found, increment refcount. */
relayd = consumer_find_relayd(stream->net_seq_idx);
if (relayd != NULL) {
uatomic_inc(&relayd->refcount);
}
+
+ /* Update channel refcount once added without error(s). */
+ uatomic_inc(&stream->chan->refcount);
+
+ /*
+ * When nb_init_streams reaches 0, we don't need to trigger any action in
+ * terms of destroying the associated channel, because the action that
+ * causes the count to become 0 also causes a stream to be added. The
+ * channel deletion will thus be triggered by the following removal of this
+ * stream.
+ */
+ if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
+ uatomic_dec(&stream->chan->nb_init_streams);
+ }
+
+ lttng_ht_add_unique_ulong(ht, &stream->waitfd_node);
rcu_read_unlock();
+
+error:
+ pthread_mutex_unlock(&consumer_data.lock);
+ return ret;
}
/*
{
int ret, i, pollfd;
uint32_t revents, nb_fd;
- struct lttng_consumer_stream *stream;
+ struct lttng_consumer_stream *stream = NULL;
struct lttng_ht_iter iter;
struct lttng_ht_node_ulong *node;
struct lttng_ht *metadata_ht = NULL;
DBG("Metadata event catched in thread");
if (ret < 0) {
if (errno == EINTR) {
+ ERR("Poll EINTR catched");
goto restart;
}
goto error;
}
+ /* From here, the event is a metadata wait fd */
for (i = 0; i < nb_fd; i++) {
revents = LTTNG_POLL_GETEV(&events, i);
pollfd = LTTNG_POLL_GETFD(&events, i);
- /* Check the metadata pipe for incoming metadata. */
+ /* Just don't waste time if no returned events for the fd */
+ if (!revents) {
+ continue;
+ }
+
if (pollfd == ctx->consumer_metadata_pipe[0]) {
if (revents & (LPOLLERR | LPOLLHUP )) {
DBG("Metadata thread pipe hung up");
DBG("Adding metadata stream %d to poll set",
stream->wait_fd);
- rcu_read_lock();
- /* The node should be init at this point */
- lttng_ht_add_unique_ulong(metadata_ht,
- &stream->waitfd_node);
- rcu_read_unlock();
+ ret = consumer_add_metadata_stream(stream, metadata_ht);
+ if (ret) {
+ ERR("Unable to add metadata stream");
+ /* Stream was not setup properly. Continuing. */
+ consumer_del_metadata_stream(stream, NULL);
+ continue;
+ }
/* Add metadata stream to the global poll events list */
lttng_poll_add(&events, stream->wait_fd,
LPOLLIN | LPOLLPRI);
-
- consumer_add_metadata_stream(stream);
}
- /* Metadata pipe handled. Continue handling the others */
+ /* Handle other stream */
continue;
}
- /* From here, the event is a metadata wait fd */
-
rcu_read_lock();
lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd),
&iter);
node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
- /* FD not found, continue loop */
- rcu_read_unlock();
- continue;
- }
+ assert(node);
stream = caa_container_of(node, struct lttng_consumer_stream,
waitfd_node);
- /* Get the data out of the metadata file descriptor */
- if (revents & (LPOLLIN | LPOLLPRI)) {
- DBG("Metadata available on fd %d", pollfd);
- assert(stream->wait_fd == pollfd);
-
- len = ctx->on_buffer_ready(stream, ctx);
- /* It's ok to have an unavailable sub-buffer */
- if (len < 0 && len != -EAGAIN) {
- rcu_read_unlock();
- goto end;
- } else if (len > 0) {
- stream->data_read = 1;
- }
- }
-
- /*
- * Remove the stream from the hash table since there is no data
- * left on the fd because we previously did a read on the buffer.
- */
+ /* Check for error event */
if (revents & (LPOLLERR | LPOLLHUP)) {
- DBG("Metadata fd %d is hup|err|nval.", pollfd);
+ DBG("Metadata fd %d is hup|err.", pollfd);
if (!stream->hangup_flush_done
&& (consumer_data.type == LTTNG_CONSUMER32_UST
|| consumer_data.type == LTTNG_CONSUMER64_UST)) {
}
}
- /* Removing it from hash table, poll set and free memory */
- lttng_ht_del(metadata_ht, &iter);
-
lttng_poll_del(&events, stream->wait_fd);
- consumer_del_metadata_stream(stream);
+ /*
+ * This call update the channel states, closes file descriptors
+ * and securely free the stream.
+ */
+ consumer_del_metadata_stream(stream, metadata_ht);
+ } else if (revents & (LPOLLIN | LPOLLPRI)) {
+ /* Get the data out of the metadata file descriptor */
+ DBG("Metadata available on fd %d", pollfd);
+ assert(stream->wait_fd == pollfd);
+
+ len = ctx->on_buffer_ready(stream, ctx);
+ /* It's ok to have an unavailable sub-buffer */
+ if (len < 0 && len != -EAGAIN) {
+ rcu_read_unlock();
+ goto end;
+ } else if (len > 0) {
+ stream->data_read = 1;
+ }
}
+
+ /* Release RCU lock for the stream looked up */
rcu_read_unlock();
}
}
if ((pollfd[i].revents & POLLHUP)) {
DBG("Polling fd %d tells it has hung up.", pollfd[i].fd);
if (!local_stream[i]->data_read) {
- consumer_del_stream(local_stream[i]);
+ consumer_del_stream(local_stream[i],
+ consumer_data.stream_ht);
num_hup++;
}
} else if (pollfd[i].revents & POLLERR) {
ERR("Error returned in polling fd %d.", pollfd[i].fd);
if (!local_stream[i]->data_read) {
- consumer_del_stream(local_stream[i]);
+ consumer_del_stream(local_stream[i],
+ consumer_data.stream_ht);
num_hup++;
}
} else if (pollfd[i].revents & POLLNVAL) {
ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
if (!local_stream[i]->data_read) {
- consumer_del_stream(local_stream[i]);
+ consumer_del_stream(local_stream[i],
+ consumer_data.stream_ht);
num_hup++;
}
}
projects / lttng-tools.git / commitdiff
