From: Jérémie Galarneau Date: Wed, 28 Nov 2018 21:53:53 +0000 (-0500) Subject: Launch the rotation thread using lttng_thread X-Git-Tag: v2.12.0-rc1~725 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=64d9b072ae17f9d2b9cc320ddef3dbe373761a93;p=lttng-tools.git Launch the rotation thread using lttng_thread Signed-off-by: Jérémie Galarneau --- diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c index 4749f8621..0c207309d 100644 --- a/src/bin/lttng-sessiond/main.c +++ b/src/bin/lttng-sessiond/main.c @@ -194,7 +194,6 @@ static pthread_t kernel_thread; static pthread_t dispatch_thread; static pthread_t agent_reg_thread; static pthread_t load_session_thread; -static pthread_t rotation_thread; static pthread_t timer_thread; /* @@ -255,9 +254,6 @@ static const char * const config_section_name = "sessiond"; /* Am I root or not. Set to 1 if the daemon is running as root */ static int is_root; -/* Rotation thread handle. */ -static struct rotation_thread_handle *rotation_thread_handle; - /* * Stop all threads by closing the thread quit pipe. */ @@ -5496,10 +5492,11 @@ int main(int argc, char **argv) struct lttng_pipe *ust32_channel_monitor_pipe = NULL, *ust64_channel_monitor_pipe = NULL, *kernel_channel_monitor_pipe = NULL; - bool rotation_thread_launched = false; bool timer_thread_launched = false; struct lttng_thread *ht_cleanup_thread = NULL; struct timer_thread_parameters timer_thread_ctx; + /* Rotation thread handle. */ + struct rotation_thread_handle *rotation_thread_handle = NULL; /* Queue of rotation jobs populated by the sessiond-timer. */ struct rotation_thread_timer_queue *rotation_timer_queue = NULL; @@ -5892,16 +5889,10 @@ int main(int argc, char **argv) } /* Create rotation thread. */ - ret = pthread_create(&rotation_thread, default_pthread_attr(), - thread_rotation, rotation_thread_handle); - if (ret) { - errno = ret; - PERROR("pthread_create rotation"); + if (!launch_rotation_thread(rotation_thread_handle)) { retval = -1; - stop_threads(); goto exit_rotation; } - rotation_thread_launched = true; /* Create thread to manage the client socket */ ret = pthread_create(&client_thread, default_pthread_attr(), @@ -6098,18 +6089,6 @@ exit_init_data: */ rcu_barrier(); - if (rotation_thread_handle) { - if (rotation_thread_launched) { - ret = pthread_join(rotation_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join rotation thread"); - retval = -1; - } - } - rotation_thread_handle_destroy(rotation_thread_handle); - } - if (timer_thread_launched) { timer_exit(); ret = pthread_join(timer_thread, &status); @@ -6125,15 +6104,18 @@ exit_init_data: lttng_thread_put(ht_cleanup_thread); } + rcu_thread_offline(); + rcu_unregister_thread(); + + if (rotation_thread_handle) { + rotation_thread_handle_destroy(rotation_thread_handle); + } + /* * After the rotation and timer thread have quit, we can safely destroy * the rotation_timer_queue. */ rotation_thread_timer_queue_destroy(rotation_timer_queue); - - rcu_thread_offline(); - rcu_unregister_thread(); - /* * The teardown of the notification system is performed after the * session daemon's teardown in order to allow it to be notified diff --git a/src/bin/lttng-sessiond/rotation-thread.c b/src/bin/lttng-sessiond/rotation-thread.c index 043993a60..9a1d803b7 100644 --- a/src/bin/lttng-sessiond/rotation-thread.c +++ b/src/bin/lttng-sessiond/rotation-thread.c @@ -44,6 +44,8 @@ #include "session.h" #include "timer.h" #include "notification-thread-commands.h" +#include "utils.h" +#include "thread.h" #include #include @@ -75,6 +77,8 @@ 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 @@ -137,8 +141,6 @@ void log_job_destruction(const struct rotation_thread_job *job) void rotation_thread_timer_queue_destroy( struct rotation_thread_timer_queue *queue) { - struct rotation_thread_job *job, *tmp_job; - if (!queue) { return; } @@ -146,12 +148,7 @@ void rotation_thread_timer_queue_destroy( 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); - } + assert(cds_list_empty(&queue->list)); pthread_mutex_unlock(&queue->lock); pthread_mutex_destroy(&queue->lock); free(queue); @@ -163,6 +160,7 @@ void rotation_thread_timer_queue_destroy( void rotation_thread_handle_destroy( struct rotation_thread_handle *handle) { + lttng_pipe_destroy(handle->quit_pipe); free(handle); } @@ -179,9 +177,16 @@ struct rotation_thread_handle *rotation_thread_handle_create( 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; } /* @@ -271,19 +276,29 @@ int init_poll_set(struct lttng_poll_event *poll_set, int ret; /* - * Create pollset with size 2: - * - quit pipe, + * Create pollset with size 3: + * - rotation thread quit pipe, * - rotation thread timer queue pipe, + * - notification channel sock, */ - ret = sessiond_set_thread_pollset(poll_set, 2); - if (ret) { + 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("[rotation-thread] 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("[rotation-thread] Failed to add rotate_pending fd to pollset"); + ERR("[rotation-thread] Failed to add rotate_pending fd to poll set"); goto error; } @@ -914,6 +929,8 @@ void *thread_rotation(void *data) int ret; struct rotation_thread_handle *handle = data; struct rotation_thread thread; + const int queue_pipe_fd = lttng_pipe_get_readfd( + handle->rotation_timer_queue->event_pipe); DBG("[rotation-thread] Started rotation thread"); @@ -977,17 +994,6 @@ void *thread_rotation(void *data) } } else { /* Job queue or quit pipe activity. */ - if (fd == lttng_pipe_get_readfd( - handle->rotation_timer_queue->event_pipe)) { - 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 error; - } - } /* * The job queue is serviced if there is @@ -1002,7 +1008,16 @@ void *thread_rotation(void *data) goto error; } - if (sessiond_check_thread_quit_pipe(fd, revents)) { + if (fd == queue_pipe_fd) { + 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 error; + } + } else { DBG("[rotation-thread] Quit pipe activity"); goto exit; } @@ -1019,3 +1034,30 @@ error: end: return NULL; } + +static +bool shutdown_rotation_thread(void *thread_data) +{ + struct rotation_thread_handle *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; +} diff --git a/src/bin/lttng-sessiond/rotation-thread.h b/src/bin/lttng-sessiond/rotation-thread.h index c45160956..b83745786 100644 --- a/src/bin/lttng-sessiond/rotation-thread.h +++ b/src/bin/lttng-sessiond/rotation-thread.h @@ -56,6 +56,6 @@ void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue, enum rotation_thread_job_type job_type, struct ltt_session *session); -void *thread_rotation(void *data); +bool launch_rotation_thread(struct rotation_thread_handle *handle); #endif /* ROTATION_THREAD_H */