+++ /dev/null
-/*
- * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-
-#include <common/hashtable/hashtable.h>
-#include <common/common.h>
-#include <common/utils.h>
-#include <pthread.h>
-
-#include "lttng-sessiond.h"
-#include "health-sessiond.h"
-#include "testpoint.h"
-#include "utils.h"
-#include "ht-cleanup.h"
-
-static int ht_cleanup_quit_pipe[2] = { -1, -1 };
-
-/*
- * Check if the ht_cleanup thread quit pipe was triggered.
- *
- * Return true if it was triggered else false;
- */
-static bool check_quit_pipe(int fd, uint32_t events)
-{
- return (fd == ht_cleanup_quit_pipe[0] && (events & LPOLLIN));
-}
-
-static int init_pipe(int *pipe_fds)
-{
- int ret, i;
-
- ret = pipe(pipe_fds);
- if (ret < 0) {
- PERROR("ht_cleanup thread quit pipe");
- goto error;
- }
-
- for (i = 0; i < 2; i++) {
- ret = fcntl(pipe_fds[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl ht_cleanup_quit_pipe");
- goto error;
- }
- }
-error:
- return ret;
-}
-
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-static int set_pollset(struct lttng_poll_event *events, size_t size)
-{
- int ret;
-
- ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto error;
- }
-
- ret = lttng_poll_add(events, ht_cleanup_quit_pipe[0],
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- goto error;
- }
-
- ret = lttng_poll_add(events, the_ht_cleanup_pipe[0], LPOLLIN | LPOLLERR);
- if (ret < 0) {
- DBG("lttng_poll_add error %d.", ret);
- goto error;
- }
-
- return 0;
-
-error:
- return ret;
-}
-
-static void cleanup_ht_cleanup_thread(void *data)
-{
- utils_close_pipe(ht_cleanup_quit_pipe);
- utils_close_pipe(the_ht_cleanup_pipe);
-}
-
-static void *thread_ht_cleanup(void *data)
-{
- int ret, i, pollfd, err = -1;
- ssize_t size_ret;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
-
- DBG("startup.");
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_HT_CLEANUP);
-
- if (testpoint(sessiond_thread_ht_cleanup)) {
- DBG("testpoint.");
- goto error_testpoint;
- }
-
- health_code_update();
-
- ret = set_pollset(&events, 2);
- if (ret < 0) {
- DBG("sessiond_set_ht_cleanup_thread_pollset error %d.", ret);
- goto error_poll_create;
- }
-
- health_code_update();
-
- while (1) {
- restart:
- DBG3("Polling.");
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- DBG3("Returning from poll on %d fds.",
- LTTNG_POLL_GETNB(&events));
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- continue;
- }
- goto error;
- }
-
- nb_fd = ret;
- for (i = 0; i < nb_fd; i++) {
- struct lttng_ht *ht;
-
- health_code_update();
-
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (pollfd != the_ht_cleanup_pipe[0]) {
- continue;
- }
-
- if (revents & LPOLLIN) {
- /* Get socket from dispatch thread. */
- size_ret = lttng_read(the_ht_cleanup_pipe[0],
- &ht, sizeof(ht));
- if (size_ret < sizeof(ht)) {
- PERROR("ht cleanup notify pipe");
- goto error;
- }
- health_code_update();
- /*
- * The whole point of this thread is to call
- * lttng_ht_destroy from a context that is NOT:
- * 1) a read-side RCU lock,
- * 2) a call_rcu thread.
- */
- lttng_ht_destroy(ht);
-
- health_code_update();
-
- /*
- * Ensure that we never process the quit pipe
- * event while there is still data available
- * on the ht clean pipe.
- */
- goto restart;
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("ht cleanup pipe error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
-
- for (i = 0; i < nb_fd; i++) {
- health_code_update();
-
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- if (pollfd == the_ht_cleanup_pipe[0]) {
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- DBG("[ht-cleanup] quit.");
- goto exit;
- }
- }
- }
-
-exit:
-error:
- lttng_poll_clean(&events);
-error_poll_create:
-error_testpoint:
- DBG("[ht-cleanup] Thread terminates.");
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(the_health_sessiond);
- rcu_thread_offline();
- rcu_unregister_thread();
- return NULL;
-}
-
-static bool shutdown_ht_cleanup_thread(void *data)
-{
- int ret;
-
- ret = notify_thread_pipe(ht_cleanup_quit_pipe[1]);
- if (ret < 0) {
- ERR("write error on ht_cleanup quit pipe");
- goto end;
- }
-end:
- return ret;
-}
-
-struct lttng_thread *launch_ht_cleanup_thread(void)
-{
- int ret;
- struct lttng_thread *thread;
-
- ret = init_pipe(the_ht_cleanup_pipe);
- if (ret) {
- goto error;
- }
-
- ret = init_pipe(ht_cleanup_quit_pipe);
- if (ret) {
- goto error;
- }
-
- thread = lttng_thread_create("HT cleanup",
- thread_ht_cleanup,
- shutdown_ht_cleanup_thread,
- cleanup_ht_cleanup_thread,
- NULL);
- if (!thread) {
- goto error;
- }
- return thread;
-error:
- cleanup_ht_cleanup_thread(NULL);
- return NULL;
-}
projects / lttng-tools.git / blobdiff