+++ /dev/null
-/*
- * Copyright (C) 2013 - 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 <assert.h>
-
-#include <common/hashtable/hashtable.h>
-#include <common/common.h>
-#include <common/utils.h>
-
-#include "lttng-sessiond.h"
-#include "health-sessiond.h"
-#include "testpoint.h"
-
-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("[ht-thread] startup.");
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_HT_CLEANUP);
-
- if (testpoint(sessiond_thread_ht_cleanup)) {
- DBG("[ht-thread] testpoint.");
- goto error_testpoint;
- }
-
- health_code_update();
-
- ret = sessiond_set_ht_cleanup_thread_pollset(&events, 2);
- if (ret < 0) {
- DBG("[ht-thread] sessiond_set_ht_cleanup_thread_pollset error %d.", ret);
- goto error_poll_create;
- }
-
- /* Add pipe to the pollset. */
- ret = lttng_poll_add(&events, ht_cleanup_pipe[0], LPOLLIN | LPOLLERR);
- if (ret < 0) {
- DBG("[ht-thread] lttng_poll_add error %d.", ret);
- goto error;
- }
-
- health_code_update();
-
- while (1) {
- DBG3("[ht-thread] Polling.");
-
- /* Inifinite blocking call, waiting for transmission */
-restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- DBG3("[ht-thread] Returning from poll on %d fds.",
- LTTNG_POLL_GETNB(&events));
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- 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 (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- if (pollfd != ht_cleanup_pipe[0]) {
- continue;
- }
-
- if (revents & LPOLLIN) {
- /* Get socket from dispatch thread. */
- size_ret = lttng_read(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();
- } 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 == ht_cleanup_pipe[0]) {
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_ht_cleanup_quit(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(health_sessiond);
- rcu_thread_offline();
- rcu_unregister_thread();
- return NULL;
-}