X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fsession.c;h=0a535cf877b581945260266f117cab69071f751d;hb=HEAD;hp=14ae874ea782ef45624447659d988c1bd3a05258;hpb=bda7c7b9b4c633de16f3d8bf109f9d21fdd9a5fb;p=lttng-tools.git diff --git a/src/bin/lttng-relayd/session.c b/src/bin/lttng-relayd/session.c deleted file mode 100644 index 14ae874ea..000000000 --- a/src/bin/lttng-relayd/session.c +++ /dev/null @@ -1,246 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * 2015 - Mathieu Desnoyers - * - * 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 -#define _LGPL_SOURCE -#include -#include - -#include "lttng-relayd.h" -#include "ctf-trace.h" -#include "session.h" -#include "stream.h" - -/* Global session id used in the session creation. */ -static uint64_t last_relay_session_id; -static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER; - -/* - * Create a new session by assigning a new session ID. - * - * Return allocated session or else NULL. - */ -struct relay_session *session_create(const char *session_name, - const char *hostname, uint32_t live_timer, - bool snapshot, uint32_t major, uint32_t minor) -{ - struct relay_session *session; - - session = zmalloc(sizeof(*session)); - if (!session) { - PERROR("relay session zmalloc"); - goto error; - } - - session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - if (!session->ctf_traces_ht) { - free(session); - session = NULL; - goto error; - } - - pthread_mutex_lock(&last_relay_session_id_lock); - session->id = ++last_relay_session_id; - pthread_mutex_unlock(&last_relay_session_id_lock); - - session->major = major; - session->minor = minor; - lttng_ht_node_init_u64(&session->session_n, session->id); - urcu_ref_init(&session->ref); - CDS_INIT_LIST_HEAD(&session->recv_list); - pthread_mutex_init(&session->lock, NULL); - pthread_mutex_init(&session->reflock, NULL); - pthread_mutex_init(&session->recv_list_lock, NULL); - - strncpy(session->session_name, session_name, - sizeof(session->session_name)); - strncpy(session->hostname, hostname, - sizeof(session->hostname)); - session->live_timer = live_timer; - session->snapshot = snapshot; - - lttng_ht_add_unique_u64(sessions_ht, &session->session_n); - -error: - return session; -} - -/* Should be called with RCU read-side lock held. */ -bool session_get(struct relay_session *session) -{ - bool has_ref = false; - - pthread_mutex_lock(&session->reflock); - if (session->ref.refcount != 0) { - has_ref = true; - urcu_ref_get(&session->ref); - } - pthread_mutex_unlock(&session->reflock); - - return has_ref; -} - -/* - * Lookup a session within the session hash table using the session id - * as key. A session reference is taken when a session is returned. - * session_put() must be called on that session. - * - * Return session or NULL if not found. - */ -struct relay_session *session_get_by_id(uint64_t id) -{ - struct relay_session *session = NULL; - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - - rcu_read_lock(); - lttng_ht_lookup(sessions_ht, &id, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - DBG("Session find by ID %" PRIu64 " id NOT found", id); - goto end; - } - session = caa_container_of(node, struct relay_session, session_n); - DBG("Session find by ID %" PRIu64 " id found", id); - if (!session_get(session)) { - session = NULL; - } -end: - rcu_read_unlock(); - return session; -} - -static void rcu_destroy_session(struct rcu_head *rcu_head) -{ - struct relay_session *session = - caa_container_of(rcu_head, struct relay_session, - rcu_node); - - free(session); -} - -/* - * Delete session from the given hash table. - * - * Return lttng ht del error code being 0 on success and 1 on failure. - */ -static int session_delete(struct relay_session *session) -{ - struct lttng_ht_iter iter; - - iter.iter.node = &session->session_n.node; - return lttng_ht_del(sessions_ht, &iter); -} - - -static void destroy_session(struct relay_session *session) -{ - int ret; - - ret = session_delete(session); - assert(!ret); - /* - * Since each trace has a reference on the session, it means - * that if we are at the point where we teardown the session, no - * trace belonging to that session exist at this point. - */ - lttng_ht_destroy(session->ctf_traces_ht); - call_rcu(&session->rcu_node, rcu_destroy_session); -} - -void session_release(struct urcu_ref *ref) -{ - struct relay_session *session = - caa_container_of(ref, struct relay_session, ref); - - destroy_session(session); -} - -void session_put(struct relay_session *session) -{ - rcu_read_lock(); - pthread_mutex_lock(&session->reflock); - urcu_ref_put(&session->ref, session_release); - pthread_mutex_unlock(&session->reflock); - rcu_read_unlock(); -} - -int session_close(struct relay_session *session) -{ - int ret = 0; - struct ctf_trace *trace; - struct lttng_ht_iter iter; - struct relay_stream *stream; - - pthread_mutex_lock(&session->lock); - DBG("closing session %" PRIu64 ": is conn already closed %d", - session->id, session->connection_closed); - if (session->connection_closed) { - ret = -1; - goto unlock; - } - session->connection_closed = true; -unlock: - pthread_mutex_unlock(&session->lock); - if (ret) { - return ret; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(session->ctf_traces_ht->ht, - &iter.iter, trace, node.node) { - ret = ctf_trace_close(trace); - if (ret) { - goto rcu_unlock; - } - } - cds_list_for_each_entry_rcu(stream, &session->recv_list, - recv_node) { - /* Close streams which have not been published yet. */ - try_stream_close(stream); - } -rcu_unlock: - rcu_read_unlock(); - if (ret) { - return ret; - } - /* Put self-reference from create. */ - session_put(session); - return ret; -} - -void print_sessions(void) -{ - struct lttng_ht_iter iter; - struct relay_session *session; - - rcu_read_lock(); - cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, - session_n.node) { - if (!session_get(session)) { - continue; - } - DBG("session %p refcount %ld session %" PRIu64, - session, - session->ref.refcount, - session->id); - session_put(session); - } - rcu_read_unlock(); -}