+++ /dev/null
-/*
- * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
- * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@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 <lttng/trigger/trigger.h>
-#include <common/error.h>
-#include <common/config/session-config.h>
-#include <common/defaults.h>
-#include <common/utils.h>
-#include <common/futex.h>
-#include <common/align.h>
-#include <common/time.h>
-#include <common/hashtable/utils.h>
-#include <sys/eventfd.h>
-#include <sys/stat.h>
-#include <time.h>
-#include <signal.h>
-#include <inttypes.h>
-
-#include <common/kernel-ctl/kernel-ctl.h>
-#include <lttng/notification/channel-internal.h>
-#include <lttng/rotate-internal.h>
-
-#include "rotation-thread.h"
-#include "lttng-sessiond.h"
-#include "health-sessiond.h"
-#include "rotate.h"
-#include "cmd.h"
-#include "session.h"
-#include "timer.h"
-#include "notification-thread-commands.h"
-
-#include <urcu.h>
-#include <urcu/list.h>
-
-struct lttng_notification_channel *rotate_notification_channel = NULL;
-
-struct rotation_thread {
- struct lttng_poll_event events;
-};
-
-struct rotation_thread_job {
- enum rotation_thread_job_type type;
- uint64_t session_id;
- /* List member in struct rotation_thread_timer_queue. */
- struct cds_list_head head;
-};
-
-/*
- * The timer thread enqueues jobs and wakes up the rotation thread.
- * When the rotation thread wakes up, it empties the queue.
- */
-struct rotation_thread_timer_queue {
- struct lttng_pipe *event_pipe;
- struct cds_list_head list;
- pthread_mutex_t lock;
-};
-
-struct rotation_thread_handle {
- int quit_pipe;
- struct rotation_thread_timer_queue *rotation_timer_queue;
- /* Access to the notification thread cmd_queue */
- struct notification_thread_handle *notification_thread_handle;
- sem_t *notification_thread_ready;
-};
-
-static
-const char *get_job_type_str(enum rotation_thread_job_type job_type)
-{
- switch (job_type) {
- case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
- return "CHECK_PENDING_ROTATION";
- case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
- return "SCHEDULED_ROTATION";
- default:
- abort();
- }
-}
-
-struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void)
-{
- struct rotation_thread_timer_queue *queue = NULL;
-
- queue = zmalloc(sizeof(*queue));
- if (!queue) {
- PERROR("Failed to allocate timer rotate queue");
- goto end;
- }
-
- queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
- CDS_INIT_LIST_HEAD(&queue->list);
- pthread_mutex_init(&queue->lock, NULL);
-end:
- return queue;
-}
-
-void log_job_destruction(const struct rotation_thread_job *job)
-{
- enum lttng_error_level log_level;
- const char *job_type_str = get_job_type_str(job->type);
-
- switch (job->type) {
- case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
- /*
- * Not a problem, the scheduled rotation is racing with the teardown
- * of the daemon. In this case, the rotation will not happen, which
- * is not a problem (or at least, not important enough to delay
- * the shutdown of the session daemon).
- */
- log_level = PRINT_DBG;
- break;
- case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
- /* This is not expected to happen; warn the user. */
- log_level = PRINT_WARN;
- break;
- default:
- abort();
- }
-
- LOG(log_level, "Rotation thread timer queue still contains job of type %s targeting session %" PRIu64 " on destruction",
- job_type_str, job->session_id);
-}
-
-void rotation_thread_timer_queue_destroy(
- struct rotation_thread_timer_queue *queue)
-{
- struct rotation_thread_job *job, *tmp_job;
-
- if (!queue) {
- return;
- }
-
- lttng_pipe_destroy(queue->event_pipe);
-
- pthread_mutex_lock(&queue->lock);
- /* Empty wait queue. */
- cds_list_for_each_entry_safe(job, tmp_job, &queue->list, head) {
- log_job_destruction(job);
- cds_list_del(&job->head);
- free(job);
- }
- pthread_mutex_unlock(&queue->lock);
- pthread_mutex_destroy(&queue->lock);
- free(queue);
-}
-
-/*
- * Destroy the thread data previously created by the init function.
- */
-void rotation_thread_handle_destroy(
- struct rotation_thread_handle *handle)
-{
- free(handle);
-}
-
-struct rotation_thread_handle *rotation_thread_handle_create(
- int quit_pipe,
- struct rotation_thread_timer_queue *rotation_timer_queue,
- struct notification_thread_handle *notification_thread_handle,
- sem_t *notification_thread_ready)
-{
- struct rotation_thread_handle *handle;
-
- handle = zmalloc(sizeof(*handle));
- if (!handle) {
- goto end;
- }
-
- handle->quit_pipe = quit_pipe;
- handle->rotation_timer_queue = rotation_timer_queue;
- handle->notification_thread_handle = notification_thread_handle;
- handle->notification_thread_ready = notification_thread_ready;
-
-end:
- return handle;
-}
-
-/*
- * Called with the rotation_thread_timer_queue lock held.
- * Return true if the same timer job already exists in the queue, false if not.
- */
-static
-bool timer_job_exists(const struct rotation_thread_timer_queue *queue,
- enum rotation_thread_job_type job_type, uint64_t session_id)
-{
- bool exists = false;
- struct rotation_thread_job *job;
-
- cds_list_for_each_entry(job, &queue->list, head) {
- if (job->session_id == session_id && job->type == job_type) {
- exists = true;
- goto end;
- }
- }
-end:
- return exists;
-}
-
-void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue,
- enum rotation_thread_job_type job_type, uint64_t session_id)
-{
- int ret;
- const char * const dummy = "!";
- struct rotation_thread_job *job = NULL;
- const char *job_type_str = get_job_type_str(job_type);
-
- pthread_mutex_lock(&queue->lock);
- if (timer_job_exists(queue, session_id, job_type)) {
- /*
- * This timer job is already pending, we don't need to add
- * it.
- */
- goto end;
- }
-
- job = zmalloc(sizeof(struct rotation_thread_job));
- if (!job) {
- PERROR("Failed to allocate rotation thread job of type \"%s\" for session id %" PRIu64,
- job_type_str, session_id);
- goto end;
- }
- job->type = job_type;
- job->session_id = session_id;
- cds_list_add_tail(&job->head, &queue->list);
-
- ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), dummy,
- 1);
- if (ret < 0) {
- /*
- * We do not want to block in the timer handler, the job has
- * been enqueued in the list, the wakeup pipe is probably full,
- * the job will be processed when the rotation_thread catches
- * up.
- */
- if (errno == EAGAIN || errno == EWOULDBLOCK) {
- /*
- * Not an error, but would be surprising and indicate
- * that the rotation thread can't keep up with the
- * current load.
- */
- DBG("Wake-up pipe of rotation thread job queue is full");
- goto end;
- }
- PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session id %" PRIu64,
- job_type_str, session_id);
- goto end;
- }
-
-end:
- pthread_mutex_unlock(&queue->lock);
-}
-
-static
-int init_poll_set(struct lttng_poll_event *poll_set,
- struct rotation_thread_handle *handle)
-{
- int ret;
-
- /*
- * Create pollset with size 2:
- * - quit pipe,
- * - rotation thread timer queue pipe,
- */
- ret = lttng_poll_create(poll_set, 2, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto end;
- }
-
- ret = lttng_poll_add(poll_set, handle->quit_pipe,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add quit_pipe fd to pollset");
- goto error;
- }
- ret = lttng_poll_add(poll_set,
- lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add rotate_pending fd to pollset");
- goto error;
- }
-
-end:
- return ret;
-error:
- lttng_poll_clean(poll_set);
- return ret;
-}
-
-static
-void fini_thread_state(struct rotation_thread *state)
-{
- lttng_poll_clean(&state->events);
- if (rotate_notification_channel) {
- lttng_notification_channel_destroy(rotate_notification_channel);
- }
-}
-
-static
-int init_thread_state(struct rotation_thread_handle *handle,
- struct rotation_thread *state)
-{
- int ret;
-
- memset(state, 0, sizeof(*state));
- lttng_poll_init(&state->events);
-
- ret = init_poll_set(&state->events, handle);
- if (ret) {
- ERR("[rotation-thread] Failed to initialize rotation thread poll set");
- goto end;
- }
-
- /*
- * We wait until the notification thread is ready to create the
- * notification channel and add it to the poll_set.
- */
- sem_wait(handle->notification_thread_ready);
- rotate_notification_channel = lttng_notification_channel_create(
- lttng_session_daemon_notification_endpoint);
- if (!rotate_notification_channel) {
- ERR("[rotation-thread] Could not create notification channel");
- ret = -1;
- goto end;
- }
- ret = lttng_poll_add(&state->events, rotate_notification_channel->socket,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add notification fd to pollset");
- goto end;
- }
-
-end:
- return ret;
-}
-
-static
-int check_session_rotation_pending_local_on_consumer(
- const struct ltt_session *session,
- struct consumer_socket *socket, bool *rotation_completed)
-{
- int ret;
-
- pthread_mutex_lock(socket->lock);
- DBG("[rotation-thread] Checking for locally pending rotation on the %s consumer for session %s",
- lttng_consumer_type_str(socket->type),
- session->name);
- ret = consumer_check_rotation_pending_local(socket,
- session->id,
- session->current_archive_id - 1);
- pthread_mutex_unlock(socket->lock);
-
- if (ret == 0) {
- /* Rotation was completed on this consumer. */
- DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" was completed on the %s consumer",
- session->current_archive_id - 1,
- session->name,
- lttng_consumer_type_str(socket->type));
- *rotation_completed = true;
- } else if (ret == 1) {
- /* Rotation pending on this consumer. */
- DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the %s consumer",
- session->current_archive_id - 1,
- session->name,
- lttng_consumer_type_str(socket->type));
- *rotation_completed = false;
- ret = 0;
- } else {
- /* Not a fatal error. */
- ERR("[rotation-thread] Encountered an error when checking if local rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the %s consumer",
- session->current_archive_id - 1,
- session->name,
- lttng_consumer_type_str(socket->type));
- *rotation_completed = false;
- }
- return ret;
-}
-
-static
-int check_session_rotation_pending_local(struct ltt_session *session)
-{
- int ret = 0;
- struct consumer_socket *socket;
- struct cds_lfht_iter iter;
- bool rotation_completed = true;
-
- /*
- * Check for a local pending rotation on all consumers (32-bit
- * user space, 64-bit user space, and kernel).
- */
- DBG("[rotation-thread] Checking for pending local rotation on session \"%s\", trace archive %" PRIu64,
- session->name, session->current_archive_id - 1);
-
- rcu_read_lock();
- if (!session->ust_session) {
- goto skip_ust;
- }
- cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht,
- &iter, socket, node.node) {
- ret = check_session_rotation_pending_local_on_consumer(session,
- socket, &rotation_completed);
- if (ret || !rotation_completed) {
- goto end;
- }
- }
-
-skip_ust:
- if (!session->kernel_session) {
- goto skip_kernel;
- }
- cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
- &iter, socket, node.node) {
- ret = check_session_rotation_pending_local_on_consumer(session,
- socket, &rotation_completed);
- if (ret || !rotation_completed) {
- goto end;
- }
- }
-skip_kernel:
-end:
- rcu_read_unlock();
-
- if (rotation_completed) {
- DBG("[rotation-thread] Local rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
- session->current_archive_id - 1,
- session->name);
- session->rotation_pending_local = false;
- }
- if (ret) {
- session->rotation_state = LTTNG_ROTATION_STATE_ERROR;
- }
- return 0;
-}
-
-static
-int check_session_rotation_pending_relay(struct ltt_session *session)
-{
- int ret;
- struct consumer_socket *socket;
- struct cds_lfht_iter iter;
- bool rotation_completed = true;
- const struct consumer_output *output;
-
- /*
- * Check for a pending rotation on any consumer as we only use
- * it as a "tunnel" to the relayd.
- */
-
- rcu_read_lock();
- if (session->ust_session) {
- cds_lfht_first(session->ust_session->consumer->socks->ht,
- &iter);
- output = session->ust_session->consumer;
- } else {
- cds_lfht_first(session->kernel_session->consumer->socks->ht,
- &iter);
- output = session->kernel_session->consumer;
- }
- assert(cds_lfht_iter_get_node(&iter));
-
- socket = caa_container_of(cds_lfht_iter_get_node(&iter),
- typeof(*socket), node.node);
-
- pthread_mutex_lock(socket->lock);
- DBG("[rotation-thread] Checking for pending relay rotation on session \"%s\", trace archive %" PRIu64 " through the %s consumer",
- session->name, session->current_archive_id - 1,
- lttng_consumer_type_str(socket->type));
- ret = consumer_check_rotation_pending_relay(socket,
- output,
- session->id,
- session->current_archive_id - 1);
- pthread_mutex_unlock(socket->lock);
-
- if (ret == 0) {
- /* Rotation was completed on the relay. */
- DBG("[rotation-thread] Relay rotation of trace archive %" PRIu64 " of session \"%s\" was completed",
- session->current_archive_id - 1,
- session->name);
- } else if (ret == 1) {
- /* Rotation pending on relay. */
- DBG("[rotation-thread] Relay rotation of trace archive %" PRIu64 " of session \"%s\" is pending",
- session->current_archive_id - 1,
- session->name);
- rotation_completed = false;
- } else {
- /* Not a fatal error. */
- ERR("[rotation-thread] Encountered an error when checking if rotation of trace archive %" PRIu64 " of session \"%s\" is pending on the relay",
- session->current_archive_id - 1,
- session->name);
- session->rotation_state = LTTNG_ROTATION_STATE_ERROR;
- rotation_completed = false;
- }
-
- rcu_read_unlock();
-
- if (rotation_completed) {
- DBG("[rotation-thread] Totation of trace archive %" PRIu64 " of session \"%s\" is complete on the relay",
- session->current_archive_id - 1,
- session->name);
- session->rotation_pending_relay = false;
- }
- return 0;
-}
-
-/*
- * Check if the last rotation was completed, called with session lock held.
- */
-static
-int check_session_rotation_pending(struct ltt_session *session,
- struct notification_thread_handle *notification_thread_handle)
-{
- int ret;
- struct lttng_trace_archive_location *location;
- time_t now;
-
- DBG("[rotation-thread] Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
- session->name, session->current_archive_id - 1);
-
- if (session->rotation_pending_local) {
- /* Updates session->rotation_pending_local as needed. */
- ret = check_session_rotation_pending_local(session);
- if (ret) {
- goto end;
- }
-
- /*
- * No need to check for a pending rotation on the relay
- * since the rotation is not even completed locally yet.
- */
- if (session->rotation_pending_local) {
- goto end;
- }
- }
-
- if (session->rotation_pending_relay) {
- /* Updates session->rotation_pending_relay as needed. */
- ret = check_session_rotation_pending_relay(session);
- if (ret) {
- goto end;
- }
-
- if (session->rotation_pending_relay) {
- goto end;
- }
- }
-
- DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " completed for "
- "session %s", session->current_archive_id - 1,
- session->name);
-
- /* Rename the completed trace archive's location. */
- now = time(NULL);
- if (now == (time_t) -1) {
- session->rotation_state = LTTNG_ROTATION_STATE_ERROR;
- ret = LTTNG_ERR_UNK;
- goto end;
- }
-
- ret = rename_completed_chunk(session, now);
- if (ret < 0) {
- ERR("Failed to rename completed rotation chunk");
- goto end;
- }
- session->last_chunk_start_ts = session->current_chunk_start_ts;
-
- /*
- * Now we can clear the "ONGOING" state in the session. New
- * rotations can start now.
- */
- session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED;
-
- /* Ownership of location is transferred. */
- location = session_get_trace_archive_location(session);
- ret = notification_thread_command_session_rotation_completed(
- notification_thread_handle,
- session->name,
- session->uid,
- session->gid,
- session->current_archive_id,
- location);
- if (ret != LTTNG_OK) {
- ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
- session->name);
- }
-
- if (!session->active) {
- /*
- * A stop command was issued during the rotation, it is
- * up to the rotation completion check to perform the
- * renaming of the last chunk that was produced.
- */
- ret = notification_thread_command_session_rotation_ongoing(
- notification_thread_handle,
- session->name,
- session->uid,
- session->gid,
- session->current_archive_id);
- if (ret != LTTNG_OK) {
- ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
- session->name);
- }
-
- ret = rename_active_chunk(session);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to rename active rotation chunk");
- goto end;
- }
-
- /* Ownership of location is transferred. */
- location = session_get_trace_archive_location(session);
- ret = notification_thread_command_session_rotation_completed(
- notification_thread_handle,
- session->name,
- session->uid,
- session->gid,
- session->current_archive_id,
- location);
- if (ret != LTTNG_OK) {
- ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s",
- session->name);
- }
- }
-
- ret = 0;
-end:
- if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
- DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " is still pending for session %s",
- session->current_archive_id - 1, session->name);
- ret = timer_session_rotation_pending_check_start(session,
- DEFAULT_ROTATE_PENDING_TIMER);
- if (ret) {
- ERR("Re-enabling rotate pending timer");
- ret = -1;
- goto end;
- }
- }
-
- return ret;
-}
-
-/* Call with the session lock held. */
-static
-int launch_session_rotation(struct ltt_session *session)
-{
- int ret;
- struct lttng_rotate_session_return rotation_return;
-
- DBG("[rotation-thread] Launching scheduled time-based rotation on session \"%s\"",
- session->name);
-
- ret = cmd_rotate_session(session, &rotation_return);
- if (ret == LTTNG_OK) {
- DBG("[rotation-thread] Scheduled time-based rotation successfully launched on session \"%s\"",
- session->name);
- } else {
- /* Don't consider errors as fatal. */
- DBG("[rotation-thread] Scheduled time-based rotation aborted for session %s: %s",
- session->name, lttng_strerror(ret));
- }
- return 0;
-}
-
-static
-int run_job(struct rotation_thread_job *job, struct ltt_session *session,
- struct notification_thread_handle *notification_thread_handle)
-{
- int ret;
-
- switch (job->type) {
- case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION:
- ret = launch_session_rotation(session);
- break;
- case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION:
- ret = check_session_rotation_pending(session,
- notification_thread_handle);
- break;
- default:
- abort();
- }
- return ret;
-}
-
-static
-int handle_job_queue(struct rotation_thread_handle *handle,
- struct rotation_thread *state,
- struct rotation_thread_timer_queue *queue)
-{
- int ret = 0;
- int fd = lttng_pipe_get_readfd(queue->event_pipe);
- struct ltt_session *session;
- char buf;
-
- ret = lttng_read(fd, &buf, 1);
- if (ret != 1) {
- ERR("[rotation-thread] Failed to read from wakeup pipe (fd = %i)", fd);
- ret = -1;
- goto end;
- }
-
- for (;;) {
- struct rotation_thread_job *job;
-
- /* Take the queue lock only to pop an element from the list. */
- pthread_mutex_lock(&queue->lock);
- if (cds_list_empty(&queue->list)) {
- pthread_mutex_unlock(&queue->lock);
- break;
- }
- job = cds_list_first_entry(&queue->list,
- typeof(*job), head);
- cds_list_del(&job->head);
- pthread_mutex_unlock(&queue->lock);
-
- session_lock_list();
- session = session_find_by_id(job->session_id);
- if (!session) {
- DBG("[rotation-thread] Session %" PRIu64 " not found",
- job->session_id);
- /*
- * This is a non-fatal error, and we cannot report it to
- * the user (timer), so just print the error and
- * continue the processing.
- *
- * While the timer thread will purge pending signals for
- * a session on the session's destruction, it is
- * possible for a job targeting that session to have
- * already been queued before it was destroyed.
- */
- session_unlock_list();
- free(job);
- continue;
- }
-
- session_lock(session);
- session_unlock_list();
-
- ret = run_job(job, session, handle->notification_thread_handle);
- session_unlock(session);
- free(job);
- if (ret) {
- goto end;
- }
- }
-
- ret = 0;
-
-end:
- return ret;
-}
-
-static
-int handle_condition(const struct lttng_condition *condition,
- const struct lttng_evaluation *evaluation,
- struct notification_thread_handle *notification_thread_handle)
-{
- int ret = 0;
- const char *condition_session_name = NULL;
- enum lttng_condition_type condition_type;
- enum lttng_condition_status condition_status;
- enum lttng_evaluation_status evaluation_status;
- uint64_t consumed;
- struct ltt_session *session;
-
- condition_type = lttng_condition_get_type(condition);
-
- if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) {
- ret = -1;
- ERR("[rotation-thread] Condition type and session usage type are not the same");
- goto end;
- }
-
- /* Fetch info to test */
- condition_status = lttng_condition_session_consumed_size_get_session_name(
- condition, &condition_session_name);
- if (condition_status != LTTNG_CONDITION_STATUS_OK) {
- ERR("[rotation-thread] Session name could not be fetched");
- ret = -1;
- goto end;
- }
- evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation,
- &consumed);
- if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) {
- ERR("[rotation-thread] Failed to get evaluation");
- ret = -1;
- goto end;
- }
-
- session_lock_list();
- session = session_find_by_name(condition_session_name);
- if (!session) {
- ret = -1;
- session_unlock_list();
- ERR("[rotation-thread] Session \"%s\" not found",
- condition_session_name);
- goto end;
- }
- session_lock(session);
- session_unlock_list();
-
- ret = unsubscribe_session_consumed_size_rotation(session,
- notification_thread_handle);
- if (ret) {
- goto end;
- }
-
- ret = cmd_rotate_session(session, NULL);
- if (ret == -LTTNG_ERR_ROTATION_PENDING) {
- DBG("Rotate already pending, subscribe to the next threshold value");
- } else if (ret != LTTNG_OK) {
- ERR("[rotation-thread] Failed to rotate on size notification with error: %s",
- lttng_strerror(ret));
- ret = -1;
- goto end_unlock;
- }
- ret = subscribe_session_consumed_size_rotation(session,
- consumed + session->rotate_size,
- notification_thread_handle);
- if (ret) {
- ERR("[rotation-thread] Failed to subscribe to session consumed size condition");
- goto end_unlock;
- }
- ret = 0;
-
-end_unlock:
- session_unlock(session);
-end:
- return ret;
-}
-
-static
-int handle_notification_channel(int fd,
- struct rotation_thread_handle *handle,
- struct rotation_thread *state)
-{
- int ret;
- bool notification_pending;
- struct lttng_notification *notification = NULL;
- enum lttng_notification_channel_status status;
- const struct lttng_evaluation *notification_evaluation;
- const struct lttng_condition *notification_condition;
-
- status = lttng_notification_channel_has_pending_notification(
- rotate_notification_channel, ¬ification_pending);
- if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
- ERR("[rotation-thread ]Error occured while checking for pending notification");
- ret = -1;
- goto end;
- }
-
- if (!notification_pending) {
- ret = 0;
- goto end;
- }
-
- /* Receive the next notification. */
- status = lttng_notification_channel_get_next_notification(
- rotate_notification_channel,
- ¬ification);
-
- switch (status) {
- case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK:
- break;
- case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED:
- /* Not an error, we will wait for the next one */
- ret = 0;
- goto end;;
- case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED:
- ERR("Notification channel was closed");
- ret = -1;
- goto end;
- default:
- /* Unhandled conditions / errors. */
- ERR("Unknown notification channel status");
- ret = -1;
- goto end;
- }
-
- notification_condition = lttng_notification_get_condition(notification);
- notification_evaluation = lttng_notification_get_evaluation(notification);
-
- ret = handle_condition(notification_condition, notification_evaluation,
- handle->notification_thread_handle);
-
-end:
- lttng_notification_destroy(notification);
- return ret;
-}
-
-void *thread_rotation(void *data)
-{
- int ret;
- struct rotation_thread_handle *handle = data;
- struct rotation_thread thread;
-
- DBG("[rotation-thread] Started rotation thread");
-
- if (!handle) {
- ERR("[rotation-thread] Invalid thread context provided");
- goto end;
- }
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
- health_code_update();
-
- ret = init_thread_state(handle, &thread);
- if (ret) {
- goto end;
- }
-
- /* Ready to handle client connections. */
- sessiond_notify_ready();
-
- while (true) {
- int fd_count, i;
-
- health_poll_entry();
- DBG("[rotation-thread] Entering poll wait");
- ret = lttng_poll_wait(&thread.events, -1);
- DBG("[rotation-thread] Poll wait returned (%i)", ret);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- continue;
- }
- ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret);
- goto error;
- }
-
- fd_count = ret;
- for (i = 0; i < fd_count; i++) {
- int fd = LTTNG_POLL_GETFD(&thread.events, i);
- uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i);
-
- DBG("[rotation-thread] Handling fd (%i) activity (%u)",
- fd, revents);
-
- if (revents & LPOLLERR) {
- ERR("[rotation-thread] Polling returned an error on fd %i", fd);
- goto error;
- }
-
- if (fd == handle->quit_pipe) {
- DBG("[rotation-thread] Quit pipe activity");
- /* TODO flush the queue. */
- goto exit;
- } else if (fd == lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe)) {
- ret = handle_job_queue(handle, &thread,
- handle->rotation_timer_queue);
- if (ret) {
- ERR("[rotation-thread] Failed to handle rotation timer pipe event");
- goto error;
- }
- } else if (fd == rotate_notification_channel->socket) {
- ret = handle_notification_channel(fd, handle,
- &thread);
- if (ret) {
- ERR("[rotation-thread] Error occured while handling activity on notification channel socket");
- goto error;
- }
- }
- }
- }
-exit:
-error:
- DBG("[rotation-thread] Exit");
- fini_thread_state(&thread);
- health_unregister(health_sessiond);
- rcu_thread_offline();
- rcu_unregister_thread();
-end:
- return NULL;
-}
projects / lttng-tools.git / blobdiff