+++ /dev/null
-/*
- * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#include <assert.h>
-#include <inttypes.h>
-#include <sys/mman.h>
-#include <unistd.h>
-
-#include <common/common.h>
-#include <common/relayd/relayd.h>
-#include <common/ust-consumer/ust-consumer.h>
-
-#include "consumer-stream.h"
-
-/*
- * RCU call to free stream. MUST only be used with call_rcu().
- */
-static void free_stream_rcu(struct rcu_head *head)
-{
- struct lttng_ht_node_u64 *node =
- caa_container_of(head, struct lttng_ht_node_u64, head);
- struct lttng_consumer_stream *stream =
- caa_container_of(node, struct lttng_consumer_stream, node);
-
- pthread_mutex_destroy(&stream->lock);
- free(stream);
-}
-
-/*
- * Close stream on the relayd side. This call can destroy a relayd if the
- * conditions are met.
- *
- * A RCU read side lock MUST be acquired if the relayd object was looked up in
- * a hash table before calling this.
- */
-void consumer_stream_relayd_close(struct lttng_consumer_stream *stream,
- struct consumer_relayd_sock_pair *relayd)
-{
- int ret;
-
- assert(stream);
- assert(relayd);
-
- uatomic_dec(&relayd->refcount);
- assert(uatomic_read(&relayd->refcount) >= 0);
-
- /* Closing streams requires to lock the control socket. */
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_send_close_stream(&relayd->control_sock,
- stream->relayd_stream_id,
- stream->next_net_seq_num - 1);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- DBG("Unable to close stream on the relayd. Continuing");
- /*
- * Continue here. There is nothing we can do for the relayd.
- * Chances are that the relayd has closed the socket so we just
- * continue cleaning up.
- */
- }
-
- /* Both conditions are met, we destroy the relayd. */
- if (uatomic_read(&relayd->refcount) == 0 &&
- uatomic_read(&relayd->destroy_flag)) {
- consumer_destroy_relayd(relayd);
- }
- stream->net_seq_idx = (uint64_t) -1ULL;
-}
-
-/*
- * Close stream's file descriptors and, if needed, close stream also on the
- * relayd side.
- *
- * The consumer data lock MUST be acquired.
- * The stream lock MUST be acquired.
- */
-void consumer_stream_close(struct lttng_consumer_stream *stream)
-{
- int ret;
- struct consumer_relayd_sock_pair *relayd;
-
- assert(stream);
-
- switch (consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- if (stream->mmap_base != NULL) {
- ret = munmap(stream->mmap_base, stream->mmap_len);
- if (ret != 0) {
- PERROR("munmap");
- }
- }
-
- if (stream->wait_fd >= 0) {
- ret = close(stream->wait_fd);
- if (ret) {
- PERROR("close");
- }
- stream->wait_fd = -1;
- }
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- break;
- default:
- ERR("Unknown consumer_data type");
- assert(0);
- }
-
- /* Close output fd. Could be a socket or local file at this point. */
- if (stream->out_fd >= 0) {
- ret = close(stream->out_fd);
- if (ret) {
- PERROR("close");
- }
- stream->out_fd = -1;
- }
-
- /* Check and cleanup relayd if needed. */
- rcu_read_lock();
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (relayd != NULL) {
- consumer_stream_relayd_close(stream, relayd);
- }
- rcu_read_unlock();
-}
-
-/*
- * Delete the stream from all possible hash tables.
- *
- * The consumer data lock MUST be acquired.
- * The stream lock MUST be acquired.
- */
-void consumer_stream_delete(struct lttng_consumer_stream *stream,
- struct lttng_ht *ht)
-{
- int ret;
- struct lttng_ht_iter iter;
-
- assert(stream);
- /* Should NEVER be called not in monitor mode. */
- assert(stream->chan->monitor);
-
- rcu_read_lock();
-
- if (ht) {
- iter.iter.node = &stream->node.node;
- ret = lttng_ht_del(ht, &iter);
- assert(!ret);
- }
-
- /* Delete from stream per channel ID hash table. */
- iter.iter.node = &stream->node_channel_id.node;
- /*
- * The returned value is of no importance. Even if the node is NOT in the
- * hash table, we continue since we may have been called by a code path
- * that did not add the stream to a (all) hash table. Same goes for the
- * next call ht del call.
- */
- (void) lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter);
-
- /* Delete from the global stream list. */
- iter.iter.node = &stream->node_session_id.node;
- /* See the previous ht del on why we ignore the returned value. */
- (void) lttng_ht_del(consumer_data.stream_list_ht, &iter);
-
- rcu_read_unlock();
-
- /* Decrement the stream count of the global consumer data. */
- assert(consumer_data.stream_count > 0);
- consumer_data.stream_count--;
-}
-
-/*
- * Free the given stream within a RCU call.
- */
-void consumer_stream_free(struct lttng_consumer_stream *stream)
-{
- assert(stream);
-
- call_rcu(&stream->node.head, free_stream_rcu);
-}
-
-/*
- * Destroy the stream's buffers of the tracer.
- */
-void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream)
-{
- assert(stream);
-
- switch (consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- lttng_ustconsumer_del_stream(stream);
- break;
- default:
- ERR("Unknown consumer_data type");
- assert(0);
- }
-}
-
-/*
- * Destroy and close a already created stream.
- */
-static void destroy_close_stream(struct lttng_consumer_stream *stream)
-{
- assert(stream);
-
- DBG("Consumer stream destroy monitored key: %" PRIu64, stream->key);
-
- /* Destroy tracer buffers of the stream. */
- consumer_stream_destroy_buffers(stream);
- /* Close down everything including the relayd if one. */
- consumer_stream_close(stream);
-}
-
-/*
- * Decrement the stream's channel refcount and if down to 0, return the channel
- * pointer so it can be destroyed by the caller or NULL if not.
- */
-static struct lttng_consumer_channel *unref_channel(
- struct lttng_consumer_stream *stream)
-{
- struct lttng_consumer_channel *free_chan = NULL;
-
- assert(stream);
- assert(stream->chan);
-
- /* Update refcount of channel and see if we need to destroy it. */
- if (!uatomic_sub_return(&stream->chan->refcount, 1)
- && !uatomic_read(&stream->chan->nb_init_stream_left)) {
- free_chan = stream->chan;
- }
-
- return free_chan;
-}
-
-/*
- * Destroy a stream completely. This will delete, close and free the stream.
- * Once return, the stream is NO longer usable. Its channel may get destroyed
- * if conditions are met for a monitored stream.
- *
- * This MUST be called WITHOUT the consumer data and stream lock acquired if
- * the stream is in _monitor_ mode else it does not matter.
- */
-void consumer_stream_destroy(struct lttng_consumer_stream *stream,
- struct lttng_ht *ht)
-{
- assert(stream);
-
- /* Stream is in monitor mode. */
- if (stream->monitor) {
- struct lttng_consumer_channel *free_chan = NULL;
-
- /*
- * This means that the stream was successfully removed from the streams
- * list of the channel and sent to the right thread managing this
- * stream thus being globally visible.
- */
- if (stream->globally_visible) {
- pthread_mutex_lock(&consumer_data.lock);
- pthread_mutex_lock(&stream->lock);
- /* Remove every reference of the stream in the consumer. */
- consumer_stream_delete(stream, ht);
-
- destroy_close_stream(stream);
-
- /* Update channel's refcount of the stream. */
- free_chan = unref_channel(stream);
-
- /* Indicates that the consumer data state MUST be updated after this. */
- consumer_data.need_update = 1;
-
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&consumer_data.lock);
- } else {
- /*
- * If the stream is not visible globally, this needs to be done
- * outside of the consumer data lock section.
- */
- free_chan = unref_channel(stream);
- }
-
- if (free_chan) {
- consumer_del_channel(free_chan);
- }
- } else {
- destroy_close_stream(stream);
- }
-
- /* Free stream within a RCU call. */
- consumer_stream_free(stream);
-}
projects / lttng-tools.git / blobdiff