File: | lwan-thread.c |
Warning: | line 785, column 38 Assigned value is garbage or undefined |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | /* | |||
2 | * lwan - simple web server | |||
3 | * Copyright (c) 2012, 2013 Leandro A. F. Pereira <leandro@hardinfo.org> | |||
4 | * | |||
5 | * This program is free software; you can redistribute it and/or | |||
6 | * modify it under the terms of the GNU General Public License | |||
7 | * as published by the Free Software Foundation; either version 2 | |||
8 | * of the License, or any later version. | |||
9 | * | |||
10 | * This program is distributed in the hope that it will be useful, | |||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |||
13 | * GNU General Public License for more details. | |||
14 | * | |||
15 | * You should have received a copy of the GNU General Public License | |||
16 | * along with this program; if not, write to the Free Software | |||
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, | |||
18 | * USA. | |||
19 | */ | |||
20 | ||||
21 | #define _GNU_SOURCE | |||
22 | #include <assert.h> | |||
23 | #include <errno(*__errno_location ()).h> | |||
24 | #include <fcntl.h> | |||
25 | #include <pthread.h> | |||
26 | #include <sched.h> | |||
27 | #include <stdlib.h> | |||
28 | #include <string.h> | |||
29 | #include <sys/epoll.h> | |||
30 | #include <sys/ioctl.h> | |||
31 | #include <sys/socket.h> | |||
32 | #include <unistd.h> | |||
33 | ||||
34 | #include "lwan-private.h" | |||
35 | #include "lwan-tq.h" | |||
36 | #include "list.h" | |||
37 | ||||
38 | static void lwan_strbuf_free_defer(void *data) | |||
39 | { | |||
40 | lwan_strbuf_free((struct lwan_strbuf *)data); | |||
41 | } | |||
42 | ||||
43 | static void graceful_close(struct lwan *l, | |||
44 | struct lwan_connection *conn, | |||
45 | char buffer[static DEFAULT_BUFFER_SIZE4096]) | |||
46 | { | |||
47 | int fd = lwan_connection_get_fd(l, conn); | |||
48 | ||||
49 | while (TIOCOUTQ0x5411) { | |||
50 | /* This ioctl isn't probably doing what it says on the tin; the details | |||
51 | * are subtle, but it seems to do the trick to allow gracefully closing | |||
52 | * the connection in some cases with minimal system calls. */ | |||
53 | int bytes_waiting; | |||
54 | int r = ioctl(fd, TIOCOUTQ0x5411, &bytes_waiting); | |||
55 | ||||
56 | if (!r && !bytes_waiting) /* See note about close(2) below. */ | |||
57 | return; | |||
58 | if (r < 0 && errno(*__errno_location ()) == EINTR4) | |||
59 | continue; | |||
60 | ||||
61 | break; | |||
62 | } | |||
63 | ||||
64 | if (UNLIKELY(shutdown(fd, SHUT_WR) < 0)__builtin_expect(((shutdown(fd, SHUT_WR) < 0)), (0))) { | |||
65 | if (UNLIKELY(errno == ENOTCONN)__builtin_expect((((*__errno_location ()) == 107)), (0))) | |||
66 | return; | |||
67 | } | |||
68 | ||||
69 | for (int tries = 0; tries < 20; tries++) { | |||
70 | ssize_t r = read(fd, buffer, DEFAULT_BUFFER_SIZE4096); | |||
71 | ||||
72 | if (!r) | |||
73 | break; | |||
74 | ||||
75 | if (r < 0) { | |||
76 | switch (errno(*__errno_location ())) { | |||
77 | case EAGAIN11: | |||
78 | break; | |||
79 | case EINTR4: | |||
80 | continue; | |||
81 | default: | |||
82 | return; | |||
83 | } | |||
84 | } | |||
85 | ||||
86 | coro_yield(conn->coro, CONN_CORO_WANT_READ); | |||
87 | } | |||
88 | ||||
89 | /* close(2) will be called when the coroutine yields with CONN_CORO_ABORT */ | |||
90 | } | |||
91 | ||||
92 | __attribute__((noreturn)) static int process_request_coro(struct coro *coro, | |||
93 | void *data) | |||
94 | { | |||
95 | /* NOTE: This function should not return; coro_yield should be used | |||
96 | * instead. This ensures the storage for `strbuf` is alive when the | |||
97 | * coroutine ends and lwan_strbuf_free() is called. */ | |||
98 | struct lwan_connection *conn = data; | |||
99 | struct lwan *lwan = conn->thread->lwan; | |||
100 | int fd = lwan_connection_get_fd(lwan, conn); | |||
101 | enum lwan_request_flags flags = lwan->config.request_flags; | |||
102 | struct lwan_strbuf strbuf = LWAN_STRBUF_STATIC_INIT(struct lwan_strbuf) { .buffer = "" }; | |||
103 | char request_buffer[DEFAULT_BUFFER_SIZE4096]; | |||
104 | struct lwan_value buffer = {.value = request_buffer, .len = 0}; | |||
105 | char *next_request = NULL((void*)0); | |||
106 | char *header_start[N_HEADER_START64]; | |||
107 | struct lwan_proxy proxy; | |||
108 | const int error_when_n_packets = lwan_calculate_n_packets(DEFAULT_BUFFER_SIZE4096); | |||
109 | ||||
110 | coro_defer(coro, lwan_strbuf_free_defer, &strbuf); | |||
111 | ||||
112 | const size_t init_gen = 1; /* 1 call to coro_defer() */ | |||
113 | assert(init_gen == coro_deferred_get_generation(coro))((void) sizeof ((init_gen == coro_deferred_get_generation(coro )) ? 1 : 0), __extension__ ({ if (init_gen == coro_deferred_get_generation (coro)) ; else __assert_fail ("init_gen == coro_deferred_get_generation(coro)" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 113, __extension__ __PRETTY_FUNCTION__); })); | |||
114 | ||||
115 | while (true1) { | |||
116 | struct lwan_request_parser_helper helper = { | |||
117 | .buffer = &buffer, | |||
118 | .next_request = next_request, | |||
119 | .error_when_n_packets = error_when_n_packets, | |||
120 | .header_start = header_start, | |||
121 | }; | |||
122 | struct lwan_request request = {.conn = conn, | |||
123 | .global_response_headers = &lwan->headers, | |||
124 | .fd = fd, | |||
125 | .response = {.buffer = &strbuf}, | |||
126 | .flags = flags, | |||
127 | .proxy = &proxy, | |||
128 | .helper = &helper}; | |||
129 | ||||
130 | lwan_process_request(lwan, &request); | |||
131 | ||||
132 | /* Run the deferred instructions now (except those used to initialize | |||
133 | * the coroutine), so that if the connection is gracefully closed, | |||
134 | * the storage for ``helper'' is still there. */ | |||
135 | coro_deferred_run(coro, init_gen); | |||
136 | ||||
137 | if (UNLIKELY(!(conn->flags & CONN_IS_KEEP_ALIVE))__builtin_expect(((!(conn->flags & CONN_IS_KEEP_ALIVE) )), (0))) { | |||
138 | graceful_close(lwan, conn, request_buffer); | |||
139 | break; | |||
140 | } | |||
141 | ||||
142 | if (next_request && *next_request) { | |||
143 | conn->flags |= CONN_CORK; | |||
144 | ||||
145 | if (!(conn->flags & CONN_EVENTS_WRITE)) | |||
146 | coro_yield(coro, CONN_CORO_WANT_WRITE); | |||
147 | } else { | |||
148 | conn->flags &= ~CONN_CORK; | |||
149 | coro_yield(coro, CONN_CORO_WANT_READ); | |||
150 | } | |||
151 | ||||
152 | /* Ensure string buffer is reset between requests, and that the backing | |||
153 | * store isn't over 2KB. */ | |||
154 | lwan_strbuf_reset_trim(&strbuf, 2048); | |||
155 | ||||
156 | /* Only allow flags from config. */ | |||
157 | flags = request.flags & (REQUEST_PROXIED | REQUEST_ALLOW_CORS); | |||
158 | next_request = helper.next_request; | |||
159 | } | |||
160 | ||||
161 | coro_yield(coro, CONN_CORO_ABORT); | |||
162 | __builtin_unreachable(); | |||
163 | } | |||
164 | ||||
165 | static ALWAYS_INLINEinline __attribute__((always_inline)) uint32_t | |||
166 | conn_flags_to_epoll_events(enum lwan_connection_flags flags) | |||
167 | { | |||
168 | static const uint32_t map[CONN_EVENTS_MASK + 1] = { | |||
169 | [0 /* Suspended (timer or await) */] = EPOLLRDHUPEPOLLRDHUP, | |||
170 | [CONN_EVENTS_WRITE] = EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, | |||
171 | [CONN_EVENTS_READ] = EPOLLINEPOLLIN | EPOLLRDHUPEPOLLRDHUP, | |||
172 | [CONN_EVENTS_READ_WRITE] = EPOLLINEPOLLIN | EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, | |||
173 | }; | |||
174 | ||||
175 | return map[flags & CONN_EVENTS_MASK]; | |||
176 | } | |||
177 | ||||
178 | static void update_epoll_flags(int fd, | |||
179 | struct lwan_connection *conn, | |||
180 | int epoll_fd, | |||
181 | enum lwan_connection_coro_yield yield_result) | |||
182 | { | |||
183 | static const enum lwan_connection_flags or_mask[CONN_CORO_MAX] = { | |||
184 | [CONN_CORO_YIELD] = 0, | |||
185 | ||||
186 | [CONN_CORO_WANT_READ_WRITE] = CONN_EVENTS_READ_WRITE, | |||
187 | [CONN_CORO_WANT_READ] = CONN_EVENTS_READ, | |||
188 | [CONN_CORO_WANT_WRITE] = CONN_EVENTS_WRITE, | |||
189 | ||||
190 | /* While the coro is suspended, we're not interested in either EPOLLIN | |||
191 | * or EPOLLOUT events. We still want to track this fd in epoll, though, | |||
192 | * so unset both so that only EPOLLRDHUP (plus the implicitly-set ones) | |||
193 | * are set. */ | |||
194 | [CONN_CORO_SUSPEND] = CONN_SUSPENDED, | |||
195 | ||||
196 | /* Ideally, when suspending a coroutine, the current flags&CONN_EVENTS_MASK | |||
197 | * would have to be stored and restored -- however, resuming as if the | |||
198 | * client coroutine is interested in a write event always guarantees that | |||
199 | * they'll be resumed as they're TCP sockets. There's a good chance that | |||
200 | * trying to read from a socket after resuming a coroutine will succeed, | |||
201 | * but if it doesn't because read() returns -EAGAIN, the I/O wrappers will | |||
202 | * yield with CONN_CORO_WANT_READ anyway. */ | |||
203 | [CONN_CORO_RESUME] = CONN_EVENTS_WRITE, | |||
204 | }; | |||
205 | static const enum lwan_connection_flags and_mask[CONN_CORO_MAX] = { | |||
206 | [CONN_CORO_YIELD] = ~0, | |||
207 | ||||
208 | [CONN_CORO_WANT_READ_WRITE] = ~0, | |||
209 | [CONN_CORO_WANT_READ] = ~CONN_EVENTS_WRITE, | |||
210 | [CONN_CORO_WANT_WRITE] = ~CONN_EVENTS_READ, | |||
211 | ||||
212 | [CONN_CORO_SUSPEND] = ~CONN_EVENTS_READ_WRITE, | |||
213 | [CONN_CORO_RESUME] = ~CONN_SUSPENDED, | |||
214 | }; | |||
215 | enum lwan_connection_flags prev_flags = conn->flags; | |||
216 | ||||
217 | conn->flags |= or_mask[yield_result]; | |||
218 | conn->flags &= and_mask[yield_result]; | |||
219 | ||||
220 | if (conn->flags == prev_flags) | |||
221 | return; | |||
222 | ||||
223 | struct epoll_event event = { | |||
224 | .events = conn_flags_to_epoll_events(conn->flags), | |||
225 | .data.ptr = conn, | |||
226 | }; | |||
227 | ||||
228 | if (UNLIKELY(epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &event) < 0)__builtin_expect(((epoll_ctl(epoll_fd, 3, fd, &event) < 0)), (0))) | |||
229 | lwan_status_perror("epoll_ctl")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 229, __FUNCTION__, "epoll_ctl"); | |||
230 | } | |||
231 | ||||
232 | static void clear_async_await_flag(void *data) | |||
233 | { | |||
234 | struct lwan_connection *async_fd_conn = data; | |||
235 | ||||
236 | async_fd_conn->flags &= ~CONN_ASYNC_AWAIT; | |||
237 | } | |||
238 | ||||
239 | static enum lwan_connection_coro_yield | |||
240 | resume_async(struct timeout_queue *tq, | |||
241 | enum lwan_connection_coro_yield yield_result, | |||
242 | int64_t from_coro, | |||
243 | struct lwan_connection *conn, | |||
244 | int epoll_fd) | |||
245 | { | |||
246 | static const enum lwan_connection_flags to_connection_flags[] = { | |||
247 | [CONN_CORO_ASYNC_AWAIT_READ] = CONN_EVENTS_READ, | |||
248 | [CONN_CORO_ASYNC_AWAIT_WRITE] = CONN_EVENTS_WRITE, | |||
249 | [CONN_CORO_ASYNC_AWAIT_READ_WRITE] = CONN_EVENTS_READ_WRITE, | |||
250 | }; | |||
251 | int await_fd = (int)((uint64_t)from_coro >> 32); | |||
252 | enum lwan_connection_flags flags; | |||
253 | int op; | |||
254 | ||||
255 | assert(await_fd >= 0)((void) sizeof ((await_fd >= 0) ? 1 : 0), __extension__ ({ if (await_fd >= 0) ; else __assert_fail ("await_fd >= 0" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 255, __extension__ __PRETTY_FUNCTION__); })); | |||
256 | assert(yield_result >= CONN_CORO_ASYNC_AWAIT_READ &&((void) sizeof ((yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE ) ? 1 : 0), __extension__ ({ if (yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE ) ; else __assert_fail ("yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 257, __extension__ __PRETTY_FUNCTION__); })) | |||
257 | yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE)((void) sizeof ((yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE ) ? 1 : 0), __extension__ ({ if (yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE ) ; else __assert_fail ("yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_AWAIT_READ_WRITE" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 257, __extension__ __PRETTY_FUNCTION__); })); | |||
258 | ||||
259 | flags = to_connection_flags[yield_result]; | |||
260 | ||||
261 | struct lwan_connection *await_fd_conn = &tq->lwan->conns[await_fd]; | |||
262 | if (LIKELY(await_fd_conn->flags & CONN_ASYNC_AWAIT)__builtin_expect((!!(await_fd_conn->flags & CONN_ASYNC_AWAIT )), (1))) { | |||
263 | if (LIKELY((await_fd_conn->flags & CONN_EVENTS_MASK) == flags)__builtin_expect((!!((await_fd_conn->flags & CONN_EVENTS_MASK ) == flags)), (1))) | |||
264 | return CONN_CORO_SUSPEND; | |||
265 | ||||
266 | op = EPOLL_CTL_MOD3; | |||
267 | } else { | |||
268 | op = EPOLL_CTL_ADD1; | |||
269 | flags |= CONN_ASYNC_AWAIT; | |||
270 | coro_defer(conn->coro, clear_async_await_flag, await_fd_conn); | |||
271 | } | |||
272 | ||||
273 | struct epoll_event event = {.events = conn_flags_to_epoll_events(flags), | |||
274 | .data.ptr = conn}; | |||
275 | if (LIKELY(!epoll_ctl(epoll_fd, op, await_fd, &event))__builtin_expect((!!(!epoll_ctl(epoll_fd, op, await_fd, & event))), (1))) { | |||
276 | await_fd_conn->flags &= ~CONN_EVENTS_MASK; | |||
277 | await_fd_conn->flags |= flags; | |||
278 | return CONN_CORO_SUSPEND; | |||
279 | } | |||
280 | ||||
281 | return CONN_CORO_ABORT; | |||
282 | } | |||
283 | ||||
284 | static ALWAYS_INLINEinline __attribute__((always_inline)) void resume_coro(struct timeout_queue *tq, | |||
285 | struct lwan_connection *conn, | |||
286 | int epoll_fd) | |||
287 | { | |||
288 | assert(conn->coro)((void) sizeof ((conn->coro) ? 1 : 0), __extension__ ({ if (conn->coro) ; else __assert_fail ("conn->coro", "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 288, __extension__ __PRETTY_FUNCTION__); })); | |||
289 | ||||
290 | int64_t from_coro = coro_resume(conn->coro); | |||
291 | enum lwan_connection_coro_yield yield_result = from_coro & 0xffffffff; | |||
292 | ||||
293 | if (UNLIKELY(yield_result >= CONN_CORO_ASYNC)__builtin_expect(((yield_result >= CONN_CORO_ASYNC)), (0))) | |||
294 | yield_result = resume_async(tq, yield_result, from_coro, conn, epoll_fd); | |||
295 | ||||
296 | if (UNLIKELY(yield_result == CONN_CORO_ABORT)__builtin_expect(((yield_result == CONN_CORO_ABORT)), (0))) | |||
297 | return timeout_queue_expire(tq, conn); | |||
298 | ||||
299 | return update_epoll_flags(lwan_connection_get_fd(tq->lwan, conn), conn, | |||
300 | epoll_fd, yield_result); | |||
301 | } | |||
302 | ||||
303 | static void update_date_cache(struct lwan_thread *thread) | |||
304 | { | |||
305 | time_t now = time(NULL((void*)0)); | |||
306 | ||||
307 | lwan_format_rfc_time(now, thread->date.date); | |||
308 | lwan_format_rfc_time(now + (time_t)thread->lwan->config.expires, | |||
309 | thread->date.expires); | |||
310 | } | |||
311 | ||||
312 | static ALWAYS_INLINEinline __attribute__((always_inline)) void spawn_coro(struct lwan_connection *conn, | |||
313 | struct coro_switcher *switcher, | |||
314 | struct timeout_queue *tq) | |||
315 | { | |||
316 | struct lwan_thread *t = conn->thread; | |||
317 | ||||
318 | assert(!conn->coro)((void) sizeof ((!conn->coro) ? 1 : 0), __extension__ ({ if (!conn->coro) ; else __assert_fail ("!conn->coro", "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 318, __extension__ __PRETTY_FUNCTION__); })); | |||
319 | assert(!(conn->flags & CONN_ASYNC_AWAIT))((void) sizeof ((!(conn->flags & CONN_ASYNC_AWAIT)) ? 1 : 0), __extension__ ({ if (!(conn->flags & CONN_ASYNC_AWAIT )) ; else __assert_fail ("!(conn->flags & CONN_ASYNC_AWAIT)" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 319, __extension__ __PRETTY_FUNCTION__); })); | |||
320 | assert(t)((void) sizeof ((t) ? 1 : 0), __extension__ ({ if (t) ; else __assert_fail ("t", "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 320, __extension__ __PRETTY_FUNCTION__); })); | |||
321 | assert((uintptr_t)t >= (uintptr_t)tq->lwan->thread.threads)((void) sizeof (((uintptr_t)t >= (uintptr_t)tq->lwan-> thread.threads) ? 1 : 0), __extension__ ({ if ((uintptr_t)t >= (uintptr_t)tq->lwan->thread.threads) ; else __assert_fail ("(uintptr_t)t >= (uintptr_t)tq->lwan->thread.threads" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 321, __extension__ __PRETTY_FUNCTION__); })); | |||
322 | assert((uintptr_t)t <((void) sizeof (((uintptr_t)t < (uintptr_t)(tq->lwan-> thread.threads + tq->lwan->thread.count)) ? 1 : 0), __extension__ ({ if ((uintptr_t)t < (uintptr_t)(tq->lwan->thread. threads + tq->lwan->thread.count)) ; else __assert_fail ("(uintptr_t)t < (uintptr_t)(tq->lwan->thread.threads + tq->lwan->thread.count)" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 323, __extension__ __PRETTY_FUNCTION__); })) | |||
323 | (uintptr_t)(tq->lwan->thread.threads + tq->lwan->thread.count))((void) sizeof (((uintptr_t)t < (uintptr_t)(tq->lwan-> thread.threads + tq->lwan->thread.count)) ? 1 : 0), __extension__ ({ if ((uintptr_t)t < (uintptr_t)(tq->lwan->thread. threads + tq->lwan->thread.count)) ; else __assert_fail ("(uintptr_t)t < (uintptr_t)(tq->lwan->thread.threads + tq->lwan->thread.count)" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 323, __extension__ __PRETTY_FUNCTION__); })); | |||
324 | ||||
325 | *conn = (struct lwan_connection) { | |||
326 | .coro = coro_new(switcher, process_request_coro, conn), | |||
327 | .flags = CONN_EVENTS_READ, | |||
328 | .time_to_expire = tq->current_time + tq->move_to_last_bump, | |||
329 | .thread = t, | |||
330 | }; | |||
331 | if (LIKELY(conn->coro)__builtin_expect((!!(conn->coro)), (1))) { | |||
332 | timeout_queue_insert(tq, conn); | |||
333 | return; | |||
334 | } | |||
335 | ||||
336 | /* FIXME: send a "busy" response to this client? we don't have a coroutine | |||
337 | * at this point, can't use lwan_send() here */ | |||
338 | lwan_status_error("Could not create coroutine, dropping connection")lwan_status_error_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 338, __FUNCTION__, "Could not create coroutine, dropping connection" ); | |||
339 | ||||
340 | conn->flags = 0; | |||
341 | ||||
342 | int fd = lwan_connection_get_fd(tq->lwan, conn); | |||
343 | shutdown(fd, SHUT_RDWRSHUT_RDWR); | |||
344 | close(fd); | |||
345 | } | |||
346 | ||||
347 | static bool_Bool process_pending_timers(struct timeout_queue *tq, | |||
348 | struct lwan_thread *t, | |||
349 | int epoll_fd) | |||
350 | { | |||
351 | struct timeout *timeout; | |||
352 | bool_Bool should_expire_timers = false0; | |||
353 | ||||
354 | while ((timeout = timeouts_get(t->wheel))) { | |||
355 | struct lwan_request *request; | |||
356 | ||||
357 | if (timeout == &tq->timeout) { | |||
358 | should_expire_timers = true1; | |||
359 | continue; | |||
360 | } | |||
361 | ||||
362 | request = container_of(timeout, struct lwan_request, timeout)((struct lwan_request *) ((char *)(timeout) - __builtin_offsetof (struct lwan_request, timeout)) + ((typeof(*(timeout)) *)0 != (typeof(((struct lwan_request *)0)->timeout) *)0)); | |||
363 | ||||
364 | update_epoll_flags(request->fd, request->conn, epoll_fd, | |||
365 | CONN_CORO_RESUME); | |||
366 | } | |||
367 | ||||
368 | if (should_expire_timers) { | |||
369 | timeout_queue_expire_waiting(tq); | |||
370 | ||||
371 | /* tq timeout expires every 1000ms if there are connections, so | |||
372 | * update the date cache at this point as well. */ | |||
373 | update_date_cache(t); | |||
374 | ||||
375 | if (!timeout_queue_empty(tq)) { | |||
376 | timeouts_add(t->wheel, &tq->timeout, 1000); | |||
377 | return true1; | |||
378 | } | |||
379 | ||||
380 | timeouts_del(t->wheel, &tq->timeout); | |||
381 | } | |||
382 | ||||
383 | return false0; | |||
384 | } | |||
385 | ||||
386 | static int | |||
387 | turn_timer_wheel(struct timeout_queue *tq, struct lwan_thread *t, int epoll_fd) | |||
388 | { | |||
389 | const int infinite_timeout = -1; | |||
390 | timeout_t wheel_timeout; | |||
391 | struct timespec now; | |||
392 | ||||
393 | if (UNLIKELY(clock_gettime(monotonic_clock_id, &now) < 0)__builtin_expect(((clock_gettime(monotonic_clock_id, &now ) < 0)), (0))) | |||
394 | lwan_status_critical("Could not get monotonic time")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 394, __FUNCTION__, "Could not get monotonic time"); | |||
395 | ||||
396 | timeouts_update(t->wheel, | |||
397 | (timeout_t)(now.tv_sec * 1000 + now.tv_nsec / 1000000)); | |||
398 | ||||
399 | /* Check if there's an expired timer. */ | |||
400 | wheel_timeout = timeouts_timeout(t->wheel); | |||
401 | if (wheel_timeout > 0) { | |||
402 | return (int)wheel_timeout; /* No, but will soon. Wake us up in | |||
403 | wheel_timeout ms. */ | |||
404 | } | |||
405 | ||||
406 | if (UNLIKELY((int64_t)wheel_timeout < 0)__builtin_expect((((int64_t)wheel_timeout < 0)), (0))) | |||
407 | return infinite_timeout; /* None found. */ | |||
408 | ||||
409 | if (!process_pending_timers(tq, t, epoll_fd)) | |||
410 | return infinite_timeout; /* No more timers to process. */ | |||
411 | ||||
412 | /* After processing pending timers, determine when to wake up. */ | |||
413 | return (int)timeouts_timeout(t->wheel); | |||
414 | } | |||
415 | ||||
416 | static bool_Bool accept_waiting_clients(const struct lwan_thread *t) | |||
417 | { | |||
418 | const struct lwan_connection *conns = t->lwan->conns; | |||
419 | ||||
420 | while (true1) { | |||
421 | int fd = | |||
422 | accept4(t->listen_fd, NULL((void*)0), NULL((void*)0), SOCK_NONBLOCKSOCK_NONBLOCK | SOCK_CLOEXECSOCK_CLOEXEC); | |||
423 | ||||
424 | if (LIKELY(fd >= 0)__builtin_expect((!!(fd >= 0)), (1))) { | |||
425 | const struct lwan_connection *conn = &conns[fd]; | |||
426 | struct epoll_event ev = { | |||
427 | .data.ptr = (void *)conn, | |||
428 | .events = conn_flags_to_epoll_events(CONN_EVENTS_READ), | |||
429 | }; | |||
430 | int r = epoll_ctl(conn->thread->epoll_fd, EPOLL_CTL_ADD1, fd, &ev); | |||
431 | ||||
432 | if (UNLIKELY(r < 0)__builtin_expect(((r < 0)), (0))) { | |||
433 | /* FIXME: send a "busy" response here? No coroutine has been | |||
434 | * created at this point to use the usual stuff, though. */ | |||
435 | lwan_status_perror("Could not add file descriptor %d to epoll "lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 437, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ) | |||
436 | "set %d. Dropping connection",lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 437, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ) | |||
437 | fd, conn->thread->epoll_fd)lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 437, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ); | |||
438 | shutdown(fd, SHUT_RDWRSHUT_RDWR); | |||
439 | close(fd); | |||
440 | } | |||
441 | ||||
442 | #if __linux__1 && defined(__x86_64__1) | |||
443 | /* Ignore errors here, as this is just a hint */ | |||
444 | (void)setsockopt(fd, SOL_SOCKET1, SO_INCOMING_CPU49, &t->cpu, sizeof(t->cpu)); | |||
445 | #endif | |||
446 | ||||
447 | continue; | |||
448 | } | |||
449 | ||||
450 | switch (errno(*__errno_location ())) { | |||
451 | default: | |||
452 | lwan_status_perror("Unexpected error while accepting connections")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 452, __FUNCTION__, "Unexpected error while accepting connections" ); | |||
453 | /* fallthrough */ | |||
454 | ||||
455 | case EAGAIN11: | |||
456 | return true1; | |||
457 | ||||
458 | case EBADF9: | |||
459 | case ECONNABORTED103: | |||
460 | case EINVAL22: | |||
461 | lwan_status_info("Listening socket closed")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 461, __FUNCTION__, "Listening socket closed"); | |||
462 | return false0; | |||
463 | } | |||
464 | } | |||
465 | ||||
466 | __builtin_unreachable(); | |||
467 | } | |||
468 | ||||
469 | static int create_listen_socket(struct lwan_thread *t, bool_Bool print_listening_msg) | |||
470 | { | |||
471 | int listen_fd; | |||
472 | ||||
473 | listen_fd = lwan_create_listen_socket(t->lwan, print_listening_msg); | |||
474 | if (listen_fd < 0) | |||
475 | lwan_status_critical("Could not create listen_fd")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 475, __FUNCTION__, "Could not create listen_fd"); | |||
476 | ||||
477 | #if __linux__1 && defined(__x86_64__1) | |||
478 | /* Ignore errors here, as this is just a hint */ | |||
479 | (void)setsockopt(listen_fd, SOL_SOCKET1, SO_INCOMING_CPU49, &t->cpu, sizeof(t->cpu)); | |||
480 | #endif | |||
481 | ||||
482 | struct epoll_event event = { | |||
483 | .events = EPOLLINEPOLLIN | EPOLLETEPOLLET | EPOLLERREPOLLERR, | |||
484 | .data.ptr = NULL((void*)0), | |||
485 | }; | |||
486 | if (epoll_ctl(t->epoll_fd, EPOLL_CTL_ADD1, listen_fd, &event) < 0) | |||
487 | lwan_status_critical_perror("Could not add socket to epoll")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 487, __FUNCTION__, "Could not add socket to epoll"); | |||
488 | ||||
489 | return listen_fd; | |||
490 | } | |||
491 | ||||
492 | static void *thread_io_loop(void *data) | |||
493 | { | |||
494 | struct lwan_thread *t = data; | |||
495 | int epoll_fd = t->epoll_fd; | |||
496 | const int max_events = LWAN_MIN((int)t->lwan->thread.max_fd, 1024)({ const __typeof__(((int)t->lwan->thread.max_fd) + 0) lwan_tmp_id6 = ((int)t->lwan->thread.max_fd); const __typeof__((1024 ) + 0) lwan_tmp_id7 = (1024); lwan_tmp_id6 > lwan_tmp_id7 ? lwan_tmp_id7 : lwan_tmp_id6; }); | |||
497 | struct lwan *lwan = t->lwan; | |||
498 | struct epoll_event *events; | |||
499 | struct coro_switcher switcher; | |||
500 | struct timeout_queue tq; | |||
501 | ||||
502 | lwan_status_debug("Worker thread #%zd starting",lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 503, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1) | |||
503 | t - t->lwan->thread.threads + 1)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 503, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1); | |||
504 | lwan_set_thread_name("worker"); | |||
505 | ||||
506 | events = calloc((size_t)max_events, sizeof(*events)); | |||
507 | if (UNLIKELY(!events)__builtin_expect(((!events)), (0))) | |||
508 | lwan_status_critical("Could not allocate memory for events")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 508, __FUNCTION__, "Could not allocate memory for events"); | |||
509 | ||||
510 | update_date_cache(t); | |||
511 | ||||
512 | timeout_queue_init(&tq, lwan); | |||
513 | ||||
514 | pthread_barrier_wait(&lwan->thread.barrier); | |||
515 | ||||
516 | for (;;) { | |||
517 | int timeout = turn_timer_wheel(&tq, t, epoll_fd); | |||
518 | int n_fds = epoll_wait(epoll_fd, events, max_events, timeout); | |||
519 | bool_Bool accepted_connections = false0; | |||
520 | ||||
521 | if (UNLIKELY(n_fds < 0)__builtin_expect(((n_fds < 0)), (0))) { | |||
522 | if (errno(*__errno_location ()) == EBADF9 || errno(*__errno_location ()) == EINVAL22) | |||
523 | break; | |||
524 | continue; | |||
525 | } | |||
526 | ||||
527 | for (struct epoll_event *event = events; n_fds--; event++) { | |||
528 | struct lwan_connection *conn; | |||
529 | ||||
530 | if (!event->data.ptr) { | |||
531 | if (LIKELY(accept_waiting_clients(t))__builtin_expect((!!(accept_waiting_clients(t))), (1))) { | |||
532 | accepted_connections = true1; | |||
533 | continue; | |||
534 | } | |||
535 | close(epoll_fd); | |||
536 | epoll_fd = -1; | |||
537 | break; | |||
538 | } | |||
539 | ||||
540 | conn = event->data.ptr; | |||
541 | ||||
542 | if (UNLIKELY(event->events & (EPOLLRDHUP | EPOLLHUP))__builtin_expect(((event->events & (EPOLLRDHUP | EPOLLHUP ))), (0))) { | |||
543 | timeout_queue_expire(&tq, conn); | |||
544 | continue; | |||
545 | } | |||
546 | ||||
547 | if (!conn->coro) { | |||
548 | spawn_coro(conn, &switcher, &tq); | |||
549 | continue; | |||
550 | } | |||
551 | ||||
552 | resume_coro(&tq, conn, epoll_fd); | |||
553 | timeout_queue_move_to_last(&tq, conn); | |||
554 | } | |||
555 | ||||
556 | if (accepted_connections) { | |||
557 | timeouts_add(t->wheel, &tq.timeout, 1000); | |||
558 | accepted_connections = false0; | |||
559 | } | |||
560 | } | |||
561 | ||||
562 | pthread_barrier_wait(&lwan->thread.barrier); | |||
563 | ||||
564 | timeout_queue_expire_all(&tq); | |||
565 | free(events); | |||
566 | ||||
567 | return NULL((void*)0); | |||
568 | } | |||
569 | ||||
570 | static void create_thread(struct lwan *l, struct lwan_thread *thread) | |||
571 | { | |||
572 | int ignore; | |||
573 | pthread_attr_t attr; | |||
574 | ||||
575 | thread->lwan = l; | |||
576 | ||||
577 | thread->wheel = timeouts_open(&ignore); | |||
578 | if (!thread->wheel) | |||
579 | lwan_status_critical("Could not create timer wheel")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 579, __FUNCTION__, "Could not create timer wheel"); | |||
580 | ||||
581 | if ((thread->epoll_fd = epoll_create1(EPOLL_CLOEXECEPOLL_CLOEXEC)) < 0) | |||
582 | lwan_status_critical_perror("epoll_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 582, __FUNCTION__, "epoll_create"); | |||
583 | ||||
584 | if (pthread_attr_init(&attr)) | |||
585 | lwan_status_critical_perror("pthread_attr_init")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 585, __FUNCTION__, "pthread_attr_init"); | |||
586 | ||||
587 | if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEMPTHREAD_SCOPE_SYSTEM)) | |||
588 | lwan_status_critical_perror("pthread_attr_setscope")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 588, __FUNCTION__, "pthread_attr_setscope"); | |||
589 | ||||
590 | if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLEPTHREAD_CREATE_JOINABLE)) | |||
591 | lwan_status_critical_perror("pthread_attr_setdetachstate")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 591, __FUNCTION__, "pthread_attr_setdetachstate"); | |||
592 | ||||
593 | if (pthread_create(&thread->self, &attr, thread_io_loop, thread)) | |||
594 | lwan_status_critical_perror("pthread_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 594, __FUNCTION__, "pthread_create"); | |||
595 | ||||
596 | if (pthread_attr_destroy(&attr)) | |||
597 | lwan_status_critical_perror("pthread_attr_destroy")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 597, __FUNCTION__, "pthread_attr_destroy"); | |||
598 | } | |||
599 | ||||
600 | #if defined(__linux__1) && defined(__x86_64__1) | |||
601 | static bool_Bool read_cpu_topology(struct lwan *l, uint32_t siblings[]) | |||
602 | { | |||
603 | char path[PATH_MAX4096]; | |||
604 | ||||
605 | for (uint32_t i = 0; i < l->available_cpus; i++) | |||
606 | siblings[i] = 0xbebacafe; | |||
607 | ||||
608 | for (unsigned int i = 0; i < l->available_cpus; i++) { | |||
609 | FILE *sib; | |||
610 | uint32_t id, sibling; | |||
611 | char separator; | |||
612 | ||||
613 | snprintf(path, sizeof(path), | |||
614 | "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list", | |||
615 | i); | |||
616 | ||||
617 | sib = fopen(path, "re"); | |||
618 | if (!sib) { | |||
619 | lwan_status_warning("Could not open `%s` to determine CPU topology",lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 620, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path) | |||
620 | path)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 620, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path); | |||
621 | return false0; | |||
622 | } | |||
623 | ||||
624 | switch (fscanf(sib, "%u%c%u", &id, &separator, &sibling)) { | |||
625 | case 2: /* No SMT */ | |||
626 | siblings[i] = id; | |||
627 | break; | |||
628 | case 3: /* SMT */ | |||
629 | if (!(separator == ',' || separator == '-')) { | |||
630 | lwan_status_critical("Expecting either ',' or '-' for sibling separator")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 630, __FUNCTION__, "Expecting either ',' or '-' for sibling separator" ); | |||
631 | __builtin_unreachable(); | |||
632 | } | |||
633 | ||||
634 | siblings[i] = sibling; | |||
635 | break; | |||
636 | default: | |||
637 | lwan_status_critical("%s has invalid format", path)lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 637, __FUNCTION__, "%s has invalid format", path); | |||
638 | __builtin_unreachable(); | |||
639 | } | |||
640 | ||||
641 | fclose(sib); | |||
642 | } | |||
643 | ||||
644 | /* Perform a sanity check here, as some systems seem to filter out the | |||
645 | * result of sysconf() to obtain the number of configured and online | |||
646 | * CPUs but don't bother changing what's available through sysfs as far | |||
647 | * as the CPU topology information goes. It's better to fall back to a | |||
648 | * possibly non-optimal setup than just crash during startup while | |||
649 | * trying to perform an out-of-bounds array access. */ | |||
650 | for (unsigned int i = 0; i < l->available_cpus; i++) { | |||
651 | if (siblings[i] == 0xbebacafe) { | |||
652 | lwan_status_warning("Could not determine sibling for CPU %d", i)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 652, __FUNCTION__, "Could not determine sibling for CPU %d" , i); | |||
653 | return false0; | |||
654 | } | |||
655 | ||||
656 | if (siblings[i] >= l->available_cpus) { | |||
657 | lwan_status_warning("CPU information topology says CPU %d exists, "lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 660, __FUNCTION__, "CPU information topology says CPU %d exists, " "but max available CPUs is %d (online CPUs: %d). " "Is Lwan running in a (broken) container?" , siblings[i], l->available_cpus, l->online_cpus) | |||
658 | "but max available CPUs is %d (online CPUs: %d). "lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 660, __FUNCTION__, "CPU information topology says CPU %d exists, " "but max available CPUs is %d (online CPUs: %d). " "Is Lwan running in a (broken) container?" , siblings[i], l->available_cpus, l->online_cpus) | |||
659 | "Is Lwan running in a (broken) container?",lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 660, __FUNCTION__, "CPU information topology says CPU %d exists, " "but max available CPUs is %d (online CPUs: %d). " "Is Lwan running in a (broken) container?" , siblings[i], l->available_cpus, l->online_cpus) | |||
660 | siblings[i], l->available_cpus, l->online_cpus)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 660, __FUNCTION__, "CPU information topology says CPU %d exists, " "but max available CPUs is %d (online CPUs: %d). " "Is Lwan running in a (broken) container?" , siblings[i], l->available_cpus, l->online_cpus); | |||
661 | return false0; | |||
662 | } | |||
663 | } | |||
664 | ||||
665 | return true1; | |||
666 | } | |||
667 | ||||
668 | static void | |||
669 | siblings_to_schedtbl(struct lwan *l, uint32_t siblings[], uint32_t schedtbl[]) | |||
670 | { | |||
671 | int *seen = alloca(l->available_cpus * sizeof(int))__builtin_alloca (l->available_cpus * sizeof(int)); | |||
672 | unsigned int n_schedtbl = 0; | |||
673 | ||||
674 | for (uint32_t i = 0; i < l->available_cpus; i++) | |||
675 | seen[i] = -1; | |||
676 | ||||
677 | for (uint32_t i = 0; i < l->available_cpus; i++) { | |||
678 | if (seen[siblings[i]] < 0) { | |||
679 | seen[siblings[i]] = (int)i; | |||
680 | } else { | |||
681 | schedtbl[n_schedtbl++] = (uint32_t)seen[siblings[i]]; | |||
682 | schedtbl[n_schedtbl++] = i; | |||
683 | } | |||
684 | } | |||
685 | ||||
686 | if (n_schedtbl != l->available_cpus) | |||
687 | memcpy(schedtbl, seen, l->available_cpus * sizeof(int)); | |||
688 | } | |||
689 | ||||
690 | static bool_Bool | |||
691 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) | |||
692 | { | |||
693 | uint32_t *siblings = alloca(l->available_cpus * sizeof(uint32_t))__builtin_alloca (l->available_cpus * sizeof(uint32_t)); | |||
694 | ||||
695 | if (read_cpu_topology(l, siblings)) { | |||
696 | uint32_t *affinity = alloca(l->available_cpus * sizeof(uint32_t))__builtin_alloca (l->available_cpus * sizeof(uint32_t)); | |||
697 | ||||
698 | siblings_to_schedtbl(l, siblings, affinity); | |||
699 | ||||
700 | for (uint32_t i = 0; i < n_threads; i++) | |||
701 | schedtbl[i] = affinity[i % l->available_cpus]; | |||
702 | return true1; | |||
703 | } | |||
704 | ||||
705 | for (uint32_t i = 0; i < n_threads; i++) | |||
706 | schedtbl[i] = (i / 2) % l->thread.count; | |||
707 | return false0; | |||
708 | } | |||
709 | ||||
710 | static void | |||
711 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t mask) | |||
712 | { | |||
713 | for (uint32_t i = 0; i < l->thread.count; i++) { | |||
714 | cpu_set_t set; | |||
715 | ||||
716 | CPU_ZERO(&set)do __builtin_memset (&set, '\0', sizeof (cpu_set_t)); while (0); | |||
717 | CPU_SET(schedtbl[i & mask], &set)(__extension__ ({ size_t __cpu = (schedtbl[i & mask]); __cpu / 8 < (sizeof (cpu_set_t)) ? (((__cpu_mask *) ((&set) ->__bits))[((__cpu) / (8 * sizeof (__cpu_mask)))] |= ((__cpu_mask ) 1 << ((__cpu) % (8 * sizeof (__cpu_mask))))) : 0; })); | |||
718 | ||||
719 | if (pthread_setaffinity_np(l->thread.threads[i].self, sizeof(set), | |||
720 | &set)) | |||
721 | lwan_status_warning("Could not set affinity for thread %d", i)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 721, __FUNCTION__, "Could not set affinity for thread %d", i ); | |||
722 | } | |||
723 | } | |||
724 | #elif defined(__x86_64__1) | |||
725 | static bool_Bool | |||
726 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) | |||
727 | { | |||
728 | for (uint32_t i = 0; i < n_threads; i++) | |||
729 | schedtbl[i] = (i / 2) % l->thread.count; | |||
730 | return false0; | |||
731 | } | |||
732 | ||||
733 | static void | |||
734 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t n) | |||
735 | { | |||
736 | } | |||
737 | #endif | |||
738 | ||||
739 | void lwan_thread_init(struct lwan *l) | |||
740 | { | |||
741 | const unsigned int total_conns = l->thread.max_fd * l->thread.count; | |||
742 | ||||
743 | if (pthread_barrier_init(&l->thread.barrier, NULL((void*)0), | |||
| ||||
744 | (unsigned)l->thread.count + 1)) | |||
745 | lwan_status_critical("Could not create barrier")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 745, __FUNCTION__, "Could not create barrier"); | |||
746 | ||||
747 | lwan_status_debug("Initializing threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 747, __FUNCTION__, "Initializing threads"); | |||
748 | ||||
749 | l->thread.threads = | |||
750 | calloc((size_t)l->thread.count, sizeof(struct lwan_thread)); | |||
751 | if (!l->thread.threads) | |||
752 | lwan_status_critical("Could not allocate memory for threads")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 752, __FUNCTION__, "Could not allocate memory for threads"); | |||
753 | ||||
754 | #ifdef __x86_64__1 | |||
755 | static_assert(sizeof(struct lwan_connection) == 32,extern int (*__Static_assert_function (void)) [!!sizeof (struct { int __error_if_negative: (sizeof(struct lwan_connection) == 32) ? 2 : -1; })] | |||
756 | "Two connections per cache line")extern int (*__Static_assert_function (void)) [!!sizeof (struct { int __error_if_negative: (sizeof(struct lwan_connection) == 32) ? 2 : -1; })]; | |||
757 | #ifdef _SC_LEVEL1_DCACHE_LINESIZE_SC_LEVEL1_DCACHE_LINESIZE | |||
758 | assert(sysconf(_SC_LEVEL1_DCACHE_LINESIZE) == 64)((void) sizeof ((sysconf(_SC_LEVEL1_DCACHE_LINESIZE) == 64) ? 1 : 0), __extension__ ({ if (sysconf(_SC_LEVEL1_DCACHE_LINESIZE ) == 64) ; else __assert_fail ("sysconf(_SC_LEVEL1_DCACHE_LINESIZE) == 64" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 758, __extension__ __PRETTY_FUNCTION__); })); | |||
759 | #endif | |||
760 | ||||
761 | lwan_status_debug("%d CPUs of %d are online. "lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 763, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus) | |||
762 | "Reading topology to pre-schedule clients",lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 763, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus) | |||
763 | l->online_cpus, l->available_cpus)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 763, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus); | |||
764 | ||||
765 | /* | |||
766 | * Pre-schedule each file descriptor, to reduce some operations in the | |||
767 | * fast path. | |||
768 | * | |||
769 | * Since struct lwan_connection is guaranteed to be 32-byte long, two of | |||
770 | * them can fill up a cache line. Assume siblings share cache lines and | |||
771 | * use the CPU topology to group two connections per cache line in such | |||
772 | * a way that false sharing is avoided. | |||
773 | */ | |||
774 | uint32_t n_threads = (uint32_t)lwan_nextpow2((size_t)((l->thread.count - 1) * 2)); | |||
775 | uint32_t *schedtbl = alloca(n_threads * sizeof(uint32_t))__builtin_alloca (n_threads * sizeof(uint32_t)); | |||
776 | ||||
777 | bool_Bool adj_affinity = topology_to_schedtbl(l, schedtbl, n_threads); | |||
778 | ||||
779 | n_threads--; /* Transform count into mask for AND below */ | |||
780 | ||||
781 | if (adj_affinity
| |||
782 | /* Save which CPU this tread will be pinned at so we can use | |||
783 | * SO_INCOMING_CPU later. */ | |||
784 | for (unsigned int i = 0; i < l->thread.count; i++) | |||
785 | l->thread.threads[i].cpu = schedtbl[i & n_threads]; | |||
| ||||
786 | } | |||
787 | ||||
788 | for (unsigned int i = 0; i < total_conns; i++) | |||
789 | l->conns[i].thread = &l->thread.threads[schedtbl[i & n_threads]]; | |||
790 | #else | |||
791 | for (unsigned int i = 0; i < l->thread.count; i++) | |||
792 | l->thread.threads[i].cpu = i % l->thread.count; | |||
793 | for (unsigned int i = 0; i < total_conns; i++) | |||
794 | l->conns[i].thread = &l->thread.threads[i % l->thread.count]; | |||
795 | #endif | |||
796 | ||||
797 | for (unsigned int i = 0; i < l->thread.count; i++) { | |||
798 | struct lwan_thread *thread = &l->thread.threads[i]; | |||
799 | ||||
800 | create_thread(l, thread); | |||
801 | ||||
802 | if ((thread->listen_fd = create_listen_socket(thread, i == 0)) < 0) | |||
803 | lwan_status_critical_perror("Could not create listening socket")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 803, __FUNCTION__, "Could not create listening socket"); | |||
804 | } | |||
805 | ||||
806 | #ifdef __x86_64__1 | |||
807 | if (adj_affinity) | |||
808 | adjust_threads_affinity(l, schedtbl, n_threads); | |||
809 | #endif | |||
810 | ||||
811 | pthread_barrier_wait(&l->thread.barrier); | |||
812 | ||||
813 | lwan_status_debug("Worker threads created and ready to serve")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 813, __FUNCTION__, "Worker threads created and ready to serve" ); | |||
814 | } | |||
815 | ||||
816 | void lwan_thread_shutdown(struct lwan *l) | |||
817 | { | |||
818 | lwan_status_debug("Shutting down threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 818, __FUNCTION__, "Shutting down threads"); | |||
819 | ||||
820 | for (unsigned int i = 0; i < l->thread.count; i++) { | |||
821 | struct lwan_thread *t = &l->thread.threads[i]; | |||
822 | int epoll_fd = t->epoll_fd; | |||
823 | int listen_fd = t->listen_fd; | |||
824 | ||||
825 | t->listen_fd = -1; | |||
826 | t->epoll_fd = -1; | |||
827 | close(epoll_fd); | |||
828 | close(listen_fd); | |||
829 | } | |||
830 | ||||
831 | pthread_barrier_wait(&l->thread.barrier); | |||
832 | pthread_barrier_destroy(&l->thread.barrier); | |||
833 | ||||
834 | for (unsigned int i = 0; i < l->thread.count; i++) { | |||
835 | struct lwan_thread *t = &l->thread.threads[i]; | |||
836 | ||||
837 | pthread_join(l->thread.threads[i].self, NULL((void*)0)); | |||
838 | timeouts_close(t->wheel); | |||
839 | } | |||
840 | ||||
841 | free(l->thread.threads); | |||
842 | } |