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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 | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
0b2dc8df MD |
20 | #include <assert.h> |
21 | ||
22 | #include <common/hashtable/hashtable.h> | |
23 | #include <common/common.h> | |
24 | #include <common/utils.h> | |
25 | ||
26 | #include "lttng-sessiond.h" | |
8782cc74 | 27 | #include "health-sessiond.h" |
9ad42ec1 | 28 | #include "testpoint.h" |
0b2dc8df MD |
29 | |
30 | void *thread_ht_cleanup(void *data) | |
31 | { | |
32 | int ret, i, pollfd, err = -1; | |
6cd525e8 | 33 | ssize_t size_ret; |
0b2dc8df MD |
34 | uint32_t revents, nb_fd; |
35 | struct lttng_poll_event events; | |
36 | ||
37 | DBG("[ht-thread] startup."); | |
38 | ||
39 | rcu_register_thread(); | |
40 | rcu_thread_online(); | |
41 | ||
6c71277b | 42 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_HT_CLEANUP); |
0b2dc8df | 43 | |
9ad42ec1 MD |
44 | if (testpoint(sessiond_thread_ht_cleanup)) { |
45 | goto error_testpoint; | |
46 | } | |
47 | ||
0b2dc8df MD |
48 | health_code_update(); |
49 | ||
4a15001e | 50 | ret = sessiond_set_ht_cleanup_thread_pollset(&events, 2); |
0b2dc8df MD |
51 | if (ret < 0) { |
52 | goto error_poll_create; | |
53 | } | |
54 | ||
55 | /* Add pipe to the pollset. */ | |
56 | ret = lttng_poll_add(&events, ht_cleanup_pipe[0], LPOLLIN | LPOLLERR); | |
57 | if (ret < 0) { | |
58 | goto error; | |
59 | } | |
60 | ||
61 | health_code_update(); | |
62 | ||
63 | while (1) { | |
4a15001e MD |
64 | int handled_event; |
65 | ||
0b2dc8df MD |
66 | DBG3("[ht-thread] Polling on %d fds.", |
67 | LTTNG_POLL_GETNB(&events)); | |
68 | ||
69 | /* Inifinite blocking call, waiting for transmission */ | |
70 | restart: | |
4a15001e | 71 | handled_event = 0; |
0b2dc8df MD |
72 | health_poll_entry(); |
73 | ret = lttng_poll_wait(&events, -1); | |
74 | health_poll_exit(); | |
75 | if (ret < 0) { | |
76 | /* | |
77 | * Restart interrupted system call. | |
78 | */ | |
79 | if (errno == EINTR) { | |
80 | goto restart; | |
81 | } | |
82 | goto error; | |
83 | } | |
84 | ||
85 | nb_fd = ret; | |
86 | ||
87 | for (i = 0; i < nb_fd; i++) { | |
88 | struct lttng_ht *ht; | |
89 | ||
90 | health_code_update(); | |
91 | ||
92 | /* Fetch once the poll data */ | |
93 | revents = LTTNG_POLL_GETEV(&events, i); | |
94 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
95 | ||
4a15001e MD |
96 | if (pollfd != ht_cleanup_pipe[0]) { |
97 | continue; | |
0b2dc8df | 98 | } |
0b2dc8df MD |
99 | |
100 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
101 | ERR("ht cleanup pipe error"); | |
102 | goto error; | |
103 | } else if (!(revents & LPOLLIN)) { | |
104 | /* No POLLIN and not a catched error, stop the thread. */ | |
105 | ERR("ht cleanup failed. revent: %u", revents); | |
106 | goto error; | |
107 | } | |
108 | ||
6cd525e8 MD |
109 | /* Get socket from dispatch thread. */ |
110 | size_ret = lttng_read(ht_cleanup_pipe[0], &ht, | |
111 | sizeof(ht)); | |
112 | if (size_ret < sizeof(ht)) { | |
0b2dc8df MD |
113 | PERROR("ht cleanup notify pipe"); |
114 | goto error; | |
115 | } | |
116 | health_code_update(); | |
117 | /* | |
118 | * The whole point of this thread is to call | |
119 | * lttng_ht_destroy from a context that is NOT: | |
120 | * 1) a read-side RCU lock, | |
121 | * 2) a call_rcu thread. | |
122 | */ | |
123 | lttng_ht_destroy(ht); | |
124 | ||
125 | health_code_update(); | |
126 | } | |
4a15001e MD |
127 | |
128 | /* Only check cleanup quit when no more work to do. */ | |
129 | if (handled_event) { | |
130 | continue; | |
131 | } | |
132 | ||
133 | for (i = 0; i < nb_fd; i++) { | |
134 | health_code_update(); | |
135 | ||
136 | /* Fetch once the poll data */ | |
137 | revents = LTTNG_POLL_GETEV(&events, i); | |
138 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
139 | ||
140 | if (pollfd == ht_cleanup_pipe[0]) { | |
141 | continue; | |
142 | } | |
143 | ||
144 | /* Thread quit pipe has been closed. Killing thread. */ | |
145 | ret = sessiond_check_ht_cleanup_quit(pollfd, revents); | |
146 | if (ret) { | |
147 | err = 0; | |
148 | goto exit; | |
149 | } | |
150 | } | |
0b2dc8df MD |
151 | } |
152 | ||
153 | exit: | |
154 | error: | |
155 | lttng_poll_clean(&events); | |
156 | error_poll_create: | |
9ad42ec1 | 157 | error_testpoint: |
4a15001e | 158 | DBG("[ht-cleanup] Thread terminates."); |
0b2dc8df MD |
159 | if (err) { |
160 | health_error(); | |
161 | ERR("Health error occurred in %s", __func__); | |
162 | } | |
8782cc74 | 163 | health_unregister(health_sessiond); |
0b2dc8df MD |
164 | rcu_thread_offline(); |
165 | rcu_unregister_thread(); | |
166 | return NULL; | |
167 | } |