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0b2dc8df MD |
1 | /* |
2 | * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | ||
21 | #include <common/hashtable/hashtable.h> | |
22 | #include <common/common.h> | |
23 | #include <common/utils.h> | |
24 | ||
25 | #include "lttng-sessiond.h" | |
8782cc74 | 26 | #include "health-sessiond.h" |
0b2dc8df MD |
27 | |
28 | void *thread_ht_cleanup(void *data) | |
29 | { | |
30 | int ret, i, pollfd, err = -1; | |
6cd525e8 | 31 | ssize_t size_ret; |
0b2dc8df MD |
32 | uint32_t revents, nb_fd; |
33 | struct lttng_poll_event events; | |
34 | ||
35 | DBG("[ht-thread] startup."); | |
36 | ||
37 | rcu_register_thread(); | |
38 | rcu_thread_online(); | |
39 | ||
6c71277b | 40 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_HT_CLEANUP); |
0b2dc8df MD |
41 | |
42 | health_code_update(); | |
43 | ||
44 | ret = sessiond_set_thread_pollset(&events, 2); | |
45 | if (ret < 0) { | |
46 | goto error_poll_create; | |
47 | } | |
48 | ||
49 | /* Add pipe to the pollset. */ | |
50 | ret = lttng_poll_add(&events, ht_cleanup_pipe[0], LPOLLIN | LPOLLERR); | |
51 | if (ret < 0) { | |
52 | goto error; | |
53 | } | |
54 | ||
55 | health_code_update(); | |
56 | ||
57 | while (1) { | |
58 | DBG3("[ht-thread] Polling on %d fds.", | |
59 | LTTNG_POLL_GETNB(&events)); | |
60 | ||
61 | /* Inifinite blocking call, waiting for transmission */ | |
62 | restart: | |
63 | health_poll_entry(); | |
64 | ret = lttng_poll_wait(&events, -1); | |
65 | health_poll_exit(); | |
66 | if (ret < 0) { | |
67 | /* | |
68 | * Restart interrupted system call. | |
69 | */ | |
70 | if (errno == EINTR) { | |
71 | goto restart; | |
72 | } | |
73 | goto error; | |
74 | } | |
75 | ||
76 | nb_fd = ret; | |
77 | ||
78 | for (i = 0; i < nb_fd; i++) { | |
79 | struct lttng_ht *ht; | |
80 | ||
81 | health_code_update(); | |
82 | ||
83 | /* Fetch once the poll data */ | |
84 | revents = LTTNG_POLL_GETEV(&events, i); | |
85 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
86 | ||
87 | /* Thread quit pipe has been closed. Killing thread. */ | |
88 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
89 | if (ret) { | |
90 | err = 0; | |
91 | goto exit; | |
92 | } | |
93 | assert(pollfd == ht_cleanup_pipe[0]); | |
94 | ||
95 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
96 | ERR("ht cleanup pipe error"); | |
97 | goto error; | |
98 | } else if (!(revents & LPOLLIN)) { | |
99 | /* No POLLIN and not a catched error, stop the thread. */ | |
100 | ERR("ht cleanup failed. revent: %u", revents); | |
101 | goto error; | |
102 | } | |
103 | ||
6cd525e8 MD |
104 | /* Get socket from dispatch thread. */ |
105 | size_ret = lttng_read(ht_cleanup_pipe[0], &ht, | |
106 | sizeof(ht)); | |
107 | if (size_ret < sizeof(ht)) { | |
0b2dc8df MD |
108 | PERROR("ht cleanup notify pipe"); |
109 | goto error; | |
110 | } | |
111 | health_code_update(); | |
112 | /* | |
113 | * The whole point of this thread is to call | |
114 | * lttng_ht_destroy from a context that is NOT: | |
115 | * 1) a read-side RCU lock, | |
116 | * 2) a call_rcu thread. | |
117 | */ | |
118 | lttng_ht_destroy(ht); | |
119 | ||
120 | health_code_update(); | |
121 | } | |
122 | } | |
123 | ||
124 | exit: | |
125 | error: | |
126 | lttng_poll_clean(&events); | |
127 | error_poll_create: | |
128 | utils_close_pipe(ht_cleanup_pipe); | |
129 | ht_cleanup_pipe[0] = ht_cleanup_pipe[1] = -1; | |
130 | DBG("[ust-thread] cleanup complete."); | |
131 | if (err) { | |
132 | health_error(); | |
133 | ERR("Health error occurred in %s", __func__); | |
134 | } | |
8782cc74 | 135 | health_unregister(health_sessiond); |
0b2dc8df MD |
136 | rcu_thread_offline(); |
137 | rcu_unregister_thread(); | |
138 | return NULL; | |
139 | } |