+/*
+ * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
+ * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#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/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 <lttng/location-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 "utils.h"
+#include "thread.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;
+ struct ltt_session *session;
+ /* 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 {
+ struct rotation_thread_timer_queue *rotation_timer_queue;
+ /* Access to the notification thread cmd_queue */
+ struct notification_thread_handle *notification_thread_handle;
+ /* Thread-specific quit pipe. */
+ struct lttng_pipe *quit_pipe;
+};
+
+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 = (rotation_thread_timer_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 rotation_thread_timer_queue_destroy(
+ struct rotation_thread_timer_queue *queue)
+{
+ if (!queue) {
+ return;
+ }
+
+ lttng_pipe_destroy(queue->event_pipe);
+
+ pthread_mutex_lock(&queue->lock);
+ LTTNG_ASSERT(cds_list_empty(&queue->list));
+ 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)
+{
+ lttng_pipe_destroy(handle->quit_pipe);
+ free(handle);
+}
+
+struct rotation_thread_handle *rotation_thread_handle_create(
+ struct rotation_thread_timer_queue *rotation_timer_queue,
+ struct notification_thread_handle *notification_thread_handle)
+{
+ struct rotation_thread_handle *handle;
+
+ handle = (rotation_thread_handle *) zmalloc(sizeof(*handle));
+ if (!handle) {
+ goto end;
+ }
+
+ handle->rotation_timer_queue = rotation_timer_queue;
+ handle->notification_thread_handle = notification_thread_handle;
+ handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC);
+ if (!handle->quit_pipe) {
+ goto error;
+ }
+
+end:
+ return handle;
+error:
+ rotation_thread_handle_destroy(handle);
+ return NULL;
+}
+
+/*
+ * 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,
+ struct ltt_session *session)
+{
+ bool exists = false;
+ struct rotation_thread_job *job;
+
+ cds_list_for_each_entry(job, &queue->list, head) {
+ if (job->session == session && 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,
+ struct ltt_session *session)
+{
+ int ret;
+ const char 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, job_type, session)) {
+ /*
+ * This timer job is already pending, we don't need to add
+ * it.
+ */
+ goto end;
+ }
+
+ job = (rotation_thread_job *) zmalloc(sizeof(struct rotation_thread_job));
+ if (!job) {
+ PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"",
+ job_type_str, session->name);
+ goto end;
+ }
+ /* No reason for this to fail as the caller must hold a reference. */
+ (void) session_get(session);
+
+ job->session = session;
+ job->type = job_type;
+ cds_list_add_tail(&job->head, &queue->list);
+
+ ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy,
+ sizeof(dummy));
+ 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 \"%s\"",
+ job_type_str, session->name);
+ 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 3:
+ * - rotation thread quit pipe,
+ * - rotation thread timer queue pipe,
+ * - notification channel sock,
+ */
+ ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = lttng_poll_add(poll_set,
+ lttng_pipe_get_readfd(handle->quit_pipe),
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add quit pipe read fd to poll set");
+ goto error;
+ }
+
+ ret = lttng_poll_add(poll_set,
+ lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add rotate_pending fd to poll set");
+ goto error;
+ }
+
+ 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("Failed to initialize rotation thread poll set");
+ goto end;
+ }
+
+ rotate_notification_channel = lttng_notification_channel_create(
+ lttng_session_daemon_notification_endpoint);
+ if (!rotate_notification_channel) {
+ ERR("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("Failed to add notification fd to pollset");
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static
+void check_session_rotation_pending_on_consumers(struct ltt_session *session,
+ bool *_rotation_completed)
+{
+ int ret = 0;
+ struct consumer_socket *socket;
+ struct cds_lfht_iter iter;
+ enum consumer_trace_chunk_exists_status exists_status;
+ uint64_t relayd_id;
+ bool chunk_exists_on_peer = false;
+ enum lttng_trace_chunk_status chunk_status;
+
+ LTTNG_ASSERT(session->chunk_being_archived);
+
+ /*
+ * Check for a local pending rotation on all consumers (32-bit
+ * user space, 64-bit user space, and kernel).
+ */
+ 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) {
+ relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ?
+ -1ULL :
+ session->ust_session->consumer->net_seq_index;
+
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_trace_chunk_exists(socket,
+ relayd_id,
+ session->id, session->chunk_being_archived,
+ &exists_status);
+ if (ret) {
+ pthread_mutex_unlock(socket->lock);
+ ERR("Error occurred while checking rotation status on consumer daemon");
+ goto end;
+ }
+
+ if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
+ pthread_mutex_unlock(socket->lock);
+ chunk_exists_on_peer = true;
+ goto end;
+ }
+ pthread_mutex_unlock(socket->lock);
+ }
+
+skip_ust:
+ if (!session->kernel_session) {
+ goto skip_kernel;
+ }
+ cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht,
+ &iter, socket, node.node) {
+ pthread_mutex_lock(socket->lock);
+ relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ?
+ -1ULL :
+ session->kernel_session->consumer->net_seq_index;
+
+ ret = consumer_trace_chunk_exists(socket,
+ relayd_id,
+ session->id, session->chunk_being_archived,
+ &exists_status);
+ if (ret) {
+ pthread_mutex_unlock(socket->lock);
+ ERR("Error occurred while checking rotation status on consumer daemon");
+ goto end;
+ }
+
+ if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) {
+ pthread_mutex_unlock(socket->lock);
+ chunk_exists_on_peer = true;
+ goto end;
+ }
+ pthread_mutex_unlock(socket->lock);
+ }
+skip_kernel:
+end:
+ rcu_read_unlock();
+
+ if (!chunk_exists_on_peer) {
+ uint64_t chunk_being_archived_id;
+
+ chunk_status = lttng_trace_chunk_get_id(
+ session->chunk_being_archived,
+ &chunk_being_archived_id);
+ LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
+ DBG("Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers",
+ chunk_being_archived_id,
+ session->name);
+ }
+ *_rotation_completed = !chunk_exists_on_peer;
+ if (ret) {
+ ret = session_reset_rotation_state(session,
+ LTTNG_ROTATION_STATE_ERROR);
+ if (ret) {
+ ERR("Failed to reset rotation state of session \"%s\"",
+ session->name);
+ }
+ }
+}
+
+/*
+ * Check if the last rotation was completed, called with session lock held.
+ * Should only return non-zero in the event of a fatal error. Doing so will
+ * shutdown the thread.
+ */
+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;
+ enum lttng_trace_chunk_status chunk_status;
+ bool rotation_completed = false;
+ const char *archived_chunk_name;
+ uint64_t chunk_being_archived_id;
+
+ if (!session->chunk_being_archived) {
+ ret = 0;
+ goto end;
+ }
+
+ chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived,
+ &chunk_being_archived_id);
+ LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
+
+ DBG("Checking for pending rotation on session \"%s\", trace archive %" PRIu64,
+ session->name, chunk_being_archived_id);
+
+ /*
+ * The rotation-pending check timer of a session is launched in
+ * one-shot mode. If the rotation is incomplete, the rotation
+ * thread will re-enable the pending-check timer.
+ *
+ * The timer thread can't stop the timer itself since it is involved
+ * in the check for the timer's quiescence.
+ */
+ ret = timer_session_rotation_pending_check_stop(session);
+ if (ret) {
+ goto check_ongoing_rotation;
+ }
+
+ check_session_rotation_pending_on_consumers(session,
+ &rotation_completed);
+ if (!rotation_completed ||
+ session->rotation_state == LTTNG_ROTATION_STATE_ERROR) {
+ goto check_ongoing_rotation;
+ }
+
+ /*
+ * Now we can clear the "ONGOING" state in the session. New
+ * rotations can start now.
+ */
+ chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived,
+ &archived_chunk_name, NULL);
+ LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
+ free(session->last_archived_chunk_name);
+ session->last_archived_chunk_name = strdup(archived_chunk_name);
+ if (!session->last_archived_chunk_name) {
+ PERROR("Failed to duplicate archived chunk name");
+ }
+ session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED);
+
+ if (!session->quiet_rotation) {
+ location = session_get_trace_archive_location(session);
+ ret = notification_thread_command_session_rotation_completed(
+ notification_thread_handle,
+ session->name,
+ session->uid,
+ session->gid,
+ session->last_archived_chunk_id.value,
+ location);
+ lttng_trace_archive_location_put(location);
+ if (ret != LTTNG_OK) {
+ ERR("Failed to notify notification thread of completed rotation for session %s",
+ session->name);
+ }
+ }
+
+ ret = 0;
+check_ongoing_rotation:
+ if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
+ chunk_status = lttng_trace_chunk_get_id(
+ session->chunk_being_archived,
+ &chunk_being_archived_id);
+ LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
+
+ DBG("Rotation of trace archive %" PRIu64 " is still pending for session %s",
+ chunk_being_archived_id, session->name);
+ ret = timer_session_rotation_pending_check_start(session,
+ DEFAULT_ROTATE_PENDING_TIMER);
+ if (ret) {
+ ERR("Failed to re-enable rotation pending timer");
+ ret = -1;
+ goto end;
+ }
+ }
+
+end:
+ return ret;
+}
+
+/* Call with the session and session_list locks held. */
+static
+int launch_session_rotation(struct ltt_session *session)
+{
+ int ret;
+ struct lttng_rotate_session_return rotation_return;
+
+ DBG("Launching scheduled time-based rotation on session \"%s\"",
+ session->name);
+
+ ret = cmd_rotate_session(session, &rotation_return, false,
+ LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
+ if (ret == LTTNG_OK) {
+ DBG("Scheduled time-based rotation successfully launched on session \"%s\"",
+ session->name);
+ } else {
+ /* Don't consider errors as fatal. */
+ DBG("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;
+
+ for (;;) {
+ struct ltt_session *session;
+ 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 = job->session;
+ if (!session) {
+ DBG("Session \"%s\" not found",
+ session->name);
+ /*
+ * 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.
+ */
+ free(job);
+ session_put(session);
+ session_unlock_list();
+ continue;
+ }
+
+ session_lock(session);
+ ret = run_job(job, session, handle->notification_thread_handle);
+ session_unlock(session);
+ /* Release reference held by the job. */
+ session_put(session);
+ session_unlock_list();
+ 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("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("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("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("Session \"%s\" not found",
+ condition_session_name);
+ goto end;
+ }
+ session_lock(session);
+
+ ret = unsubscribe_session_consumed_size_rotation(session,
+ notification_thread_handle);
+ if (ret) {
+ goto end_unlock;
+ }
+
+ ret = cmd_rotate_session(session, NULL, false,
+ LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
+ if (ret == -LTTNG_ERR_ROTATION_PENDING) {
+ DBG("Rotate already pending, subscribe to the next threshold value");
+ } else if (ret != LTTNG_OK) {
+ ERR("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("Failed to subscribe to session consumed size condition");
+ goto end_unlock;
+ }
+ ret = 0;
+
+end_unlock:
+ session_unlock(session);
+ session_put(session);
+ session_unlock_list();
+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("Error occurred 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;
+}
+
+static
+void *thread_rotation(void *data)
+{
+ int ret;
+ struct rotation_thread_handle *handle = (rotation_thread_handle *) data;
+ struct rotation_thread thread;
+ int queue_pipe_fd;
+
+ DBG("Started rotation thread");
+ rcu_register_thread();
+ rcu_thread_online();
+ health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
+ health_code_update();
+
+ if (!handle) {
+ ERR("Invalid thread context provided");
+ goto end;
+ }
+
+ queue_pipe_fd = lttng_pipe_get_readfd(
+ handle->rotation_timer_queue->event_pipe);
+
+
+ ret = init_thread_state(handle, &thread);
+ if (ret) {
+ goto error;
+ }
+
+ while (true) {
+ int fd_count, i;
+
+ health_poll_entry();
+ DBG("Entering poll wait");
+ ret = lttng_poll_wait(&thread.events, -1);
+ DBG("Poll wait returned (%i)", ret);
+ health_poll_exit();
+ if (ret < 0) {
+ /*
+ * Restart interrupted system call.
+ */
+ if (errno == EINTR) {
+ continue;
+ }
+ ERR("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("Handling fd (%i) activity (%u)",
+ fd, revents);
+
+ if (revents & LPOLLERR) {
+ ERR("Polling returned an error on fd %i", fd);
+ goto error;
+ }
+
+ if (fd == rotate_notification_channel->socket) {
+ ret = handle_notification_channel(fd, handle,
+ &thread);
+ if (ret) {
+ ERR("Error occurred while handling activity on notification channel socket");
+ goto error;
+ }
+ } else {
+ /* Job queue or quit pipe activity. */
+
+ /*
+ * The job queue is serviced if there is
+ * activity on the quit pipe to ensure it is
+ * flushed and all references held in the queue
+ * are released.
+ */
+ ret = handle_job_queue(handle, &thread,
+ handle->rotation_timer_queue);
+ if (ret) {
+ ERR("Failed to handle rotation timer pipe event");
+ goto error;
+ }
+
+ if (fd == queue_pipe_fd) {
+ char buf;
+
+ ret = lttng_read(fd, &buf, 1);
+ if (ret != 1) {
+ ERR("Failed to read from wakeup pipe (fd = %i)", fd);
+ goto error;
+ }
+ } else {
+ DBG("Quit pipe activity");
+ goto exit;
+ }
+ }
+ }
+ }
+exit:
+error:
+ DBG("Thread exit");
+ fini_thread_state(&thread);
+end:
+ health_unregister(the_health_sessiond);
+ rcu_thread_offline();
+ rcu_unregister_thread();
+ return NULL;
+}
+
+static
+bool shutdown_rotation_thread(void *thread_data)
+{
+ struct rotation_thread_handle *handle = (rotation_thread_handle *) thread_data;
+ const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe);
+
+ return notify_thread_pipe(write_fd) == 1;
+}
+
+bool launch_rotation_thread(struct rotation_thread_handle *handle)
+{
+ struct lttng_thread *thread;
+
+ thread = lttng_thread_create("Rotation",
+ thread_rotation,
+ shutdown_rotation_thread,
+ NULL,
+ handle);
+ if (!thread) {
+ goto error;
+ }
+ lttng_thread_put(thread);
+ return true;
+error:
+ return false;
+}
projects / lttng-tools.git / blobdiff