+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- * 2015 - Mathieu Desnoyers <mathieu.desnoyers@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 _LGPL_SOURCE
-#include <common/common.h>
-#include <urcu/rculist.h>
-
-#include "lttng-relayd.h"
-#include "ctf-trace.h"
-#include "session.h"
-#include "viewer-session.h"
-#include "viewer-stream.h"
-#include "stream.h"
-
-struct relay_viewer_session *viewer_session_create(void)
-{
- struct relay_viewer_session *vsession;
-
- vsession = zmalloc(sizeof(*vsession));
- if (!vsession) {
- goto end;
- }
- CDS_INIT_LIST_HEAD(&vsession->session_list);
-end:
- return vsession;
-}
-
-/* The existence of session must be guaranteed by the caller. */
-int viewer_session_attach(struct relay_viewer_session *vsession,
- struct relay_session *session)
-{
- int ret = 0;
-
- ASSERT_LOCKED(session->lock);
-
- /* Will not fail, as per the ownership guarantee. */
- if (!session_get(session)) {
- ret = -1;
- goto end;
- }
- if (session->viewer_attached) {
- ret = -1;
- } else {
- session->viewer_attached = true;
- }
-
- if (!ret) {
- pthread_mutex_lock(&vsession->session_list_lock);
- /* Ownership is transfered to the list. */
- cds_list_add_rcu(&session->viewer_session_node,
- &vsession->session_list);
- pthread_mutex_unlock(&vsession->session_list_lock);
- } else {
- /* Put our local ref. */
- session_put(session);
- }
-end:
- return ret;
-}
-
-/* The existence of session must be guaranteed by the caller. */
-static int viewer_session_detach(struct relay_viewer_session *vsession,
- struct relay_session *session)
-{
- int ret = 0;
-
- pthread_mutex_lock(&session->lock);
- if (!session->viewer_attached) {
- ret = -1;
- } else {
- session->viewer_attached = false;
- }
-
- if (!ret) {
- pthread_mutex_lock(&vsession->session_list_lock);
- cds_list_del_rcu(&session->viewer_session_node);
- pthread_mutex_unlock(&vsession->session_list_lock);
- /* Release reference held by the list. */
- session_put(session);
- }
- /* Safe since we know the session exists. */
- pthread_mutex_unlock(&session->lock);
- return ret;
-}
-
-void viewer_session_destroy(struct relay_viewer_session *vsession)
-{
- lttng_trace_chunk_put(vsession->current_trace_chunk);
- free(vsession);
-}
-
-/*
- * Release ownership of all the streams of one session and detach the viewer.
- */
-void viewer_session_close_one_session(struct relay_viewer_session *vsession,
- struct relay_session *session)
-{
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *vstream;
-
- /*
- * TODO: improvement: create more efficient list of
- * vstream per session.
- */
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter,
- vstream, stream_n.node) {
- if (!viewer_stream_get(vstream)) {
- continue;
- }
- if (vstream->stream->trace->session != session) {
- viewer_stream_put(vstream);
- continue;
- }
- /* Put local reference. */
- viewer_stream_put(vstream);
- /*
- * We have reached one of the viewer stream's lifetime
- * end condition. This "put" will cause the proper
- * teardown of the viewer stream.
- */
- viewer_stream_put(vstream);
- }
-
- viewer_session_detach(vsession, session);
-}
-
-void viewer_session_close(struct relay_viewer_session *vsession)
-{
- struct relay_session *session;
-
- rcu_read_lock();
- cds_list_for_each_entry_rcu(session,
- &vsession->session_list, viewer_session_node) {
- viewer_session_close_one_session(vsession, session);
- }
- rcu_read_unlock();
-}
-
-/*
- * Check if a connection is attached to a session.
- * Return 1 if attached, 0 if not attached, a negative value on error.
- */
-int viewer_session_is_attached(struct relay_viewer_session *vsession,
- struct relay_session *session)
-{
- struct relay_session *iter;
- int found = 0;
-
- pthread_mutex_lock(&session->lock);
- if (!vsession) {
- goto end;
- }
- if (!session->viewer_attached) {
- goto end;
- }
- rcu_read_lock();
- cds_list_for_each_entry_rcu(iter,
- &vsession->session_list,
- viewer_session_node) {
- if (session == iter) {
- found = 1;
- goto end_rcu_unlock;
- }
- }
-end_rcu_unlock:
- rcu_read_unlock();
-end:
- pthread_mutex_unlock(&session->lock);
- return found;
-}
-
-int viewer_session_set_trace_chunk(struct relay_viewer_session *vsession,
- struct lttng_trace_chunk *relay_session_trace_chunk)
-{
- int ret = 0;
- struct lttng_trace_chunk *viewer_chunk;
-
- assert(relay_session_trace_chunk);
- assert(!vsession->current_trace_chunk);
-
- DBG("Copying relay session's current trace chunk to the viewer session");
- viewer_chunk = lttng_trace_chunk_copy(relay_session_trace_chunk);
- if (!viewer_chunk) {
- ERR("Failed to create a viewer trace chunk from the relay session's current chunk");
- ret = -1;
- goto end;
- }
-
- vsession->current_trace_chunk = viewer_chunk;
-end:
- return ret;
-}
projects / lttng-tools.git / blobdiff