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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 | 44 | if (testpoint(sessiond_thread_ht_cleanup)) { |
74588b4d | 45 | DBG("[ht-thread] testpoint."); |
9ad42ec1 MD |
46 | goto error_testpoint; |
47 | } | |
48 | ||
0b2dc8df MD |
49 | health_code_update(); |
50 | ||
4a15001e | 51 | ret = sessiond_set_ht_cleanup_thread_pollset(&events, 2); |
0b2dc8df | 52 | if (ret < 0) { |
74588b4d | 53 | DBG("[ht-thread] sessiond_set_ht_cleanup_thread_pollset error %d.", ret); |
0b2dc8df MD |
54 | goto error_poll_create; |
55 | } | |
56 | ||
57 | /* Add pipe to the pollset. */ | |
58 | ret = lttng_poll_add(&events, ht_cleanup_pipe[0], LPOLLIN | LPOLLERR); | |
59 | if (ret < 0) { | |
74588b4d | 60 | DBG("[ht-thread] lttng_poll_add error %d.", ret); |
0b2dc8df MD |
61 | goto error; |
62 | } | |
63 | ||
64 | health_code_update(); | |
65 | ||
66 | while (1) { | |
4a15001e MD |
67 | int handled_event; |
68 | ||
0b2dc8df MD |
69 | DBG3("[ht-thread] Polling on %d fds.", |
70 | LTTNG_POLL_GETNB(&events)); | |
71 | ||
72 | /* Inifinite blocking call, waiting for transmission */ | |
73 | restart: | |
4a15001e | 74 | handled_event = 0; |
0b2dc8df MD |
75 | health_poll_entry(); |
76 | ret = lttng_poll_wait(&events, -1); | |
77 | health_poll_exit(); | |
78 | if (ret < 0) { | |
79 | /* | |
80 | * Restart interrupted system call. | |
81 | */ | |
82 | if (errno == EINTR) { | |
83 | goto restart; | |
84 | } | |
85 | goto error; | |
86 | } | |
87 | ||
88 | nb_fd = ret; | |
89 | ||
90 | for (i = 0; i < nb_fd; i++) { | |
91 | struct lttng_ht *ht; | |
92 | ||
93 | health_code_update(); | |
94 | ||
95 | /* Fetch once the poll data */ | |
96 | revents = LTTNG_POLL_GETEV(&events, i); | |
97 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
98 | ||
4a15001e MD |
99 | if (pollfd != ht_cleanup_pipe[0]) { |
100 | continue; | |
0b2dc8df | 101 | } |
0b2dc8df MD |
102 | |
103 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
104 | ERR("ht cleanup pipe error"); | |
105 | goto error; | |
106 | } else if (!(revents & LPOLLIN)) { | |
107 | /* No POLLIN and not a catched error, stop the thread. */ | |
108 | ERR("ht cleanup failed. revent: %u", revents); | |
109 | goto error; | |
110 | } | |
111 | ||
6cd525e8 MD |
112 | /* Get socket from dispatch thread. */ |
113 | size_ret = lttng_read(ht_cleanup_pipe[0], &ht, | |
114 | sizeof(ht)); | |
115 | if (size_ret < sizeof(ht)) { | |
0b2dc8df MD |
116 | PERROR("ht cleanup notify pipe"); |
117 | goto error; | |
118 | } | |
119 | health_code_update(); | |
120 | /* | |
121 | * The whole point of this thread is to call | |
122 | * lttng_ht_destroy from a context that is NOT: | |
123 | * 1) a read-side RCU lock, | |
124 | * 2) a call_rcu thread. | |
125 | */ | |
126 | lttng_ht_destroy(ht); | |
127 | ||
128 | health_code_update(); | |
129 | } | |
4a15001e MD |
130 | |
131 | /* Only check cleanup quit when no more work to do. */ | |
132 | if (handled_event) { | |
133 | continue; | |
134 | } | |
135 | ||
136 | for (i = 0; i < nb_fd; i++) { | |
137 | health_code_update(); | |
138 | ||
139 | /* Fetch once the poll data */ | |
140 | revents = LTTNG_POLL_GETEV(&events, i); | |
141 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
142 | ||
143 | if (pollfd == ht_cleanup_pipe[0]) { | |
144 | continue; | |
145 | } | |
146 | ||
147 | /* Thread quit pipe has been closed. Killing thread. */ | |
148 | ret = sessiond_check_ht_cleanup_quit(pollfd, revents); | |
149 | if (ret) { | |
150 | err = 0; | |
74588b4d | 151 | DBG("[ht-cleanup] quit."); |
4a15001e MD |
152 | goto exit; |
153 | } | |
154 | } | |
0b2dc8df MD |
155 | } |
156 | ||
157 | exit: | |
158 | error: | |
159 | lttng_poll_clean(&events); | |
160 | error_poll_create: | |
9ad42ec1 | 161 | error_testpoint: |
4a15001e | 162 | DBG("[ht-cleanup] Thread terminates."); |
0b2dc8df MD |
163 | if (err) { |
164 | health_error(); | |
165 | ERR("Health error occurred in %s", __func__); | |
166 | } | |
8782cc74 | 167 | health_unregister(health_sessiond); |
0b2dc8df MD |
168 | rcu_thread_offline(); |
169 | rcu_unregister_thread(); | |
170 | return NULL; | |
171 | } |