File: | lwan-thread.c |
Warning: | line 593, column 13 Value stored to 'accepted_connections' is never read |
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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 | #if defined(HAVE_SO_ATTACH_REUSEPORT_CBPF) |
35 | #include <linux1/filter.h> |
36 | #endif |
37 | |
38 | #include "lwan-private.h" |
39 | #include "lwan-tq.h" |
40 | #include "list.h" |
41 | |
42 | static void lwan_strbuf_free_defer(void *data) |
43 | { |
44 | lwan_strbuf_free((struct lwan_strbuf *)data); |
45 | } |
46 | |
47 | static void graceful_close(struct lwan *l, |
48 | struct lwan_connection *conn, |
49 | char buffer[static DEFAULT_BUFFER_SIZE4096]) |
50 | { |
51 | int fd = lwan_connection_get_fd(l, conn); |
52 | |
53 | while (TIOCOUTQ0x5411) { |
54 | /* This ioctl isn't probably doing what it says on the tin; the details |
55 | * are subtle, but it seems to do the trick to allow gracefully closing |
56 | * the connection in some cases with minimal system calls. */ |
57 | int bytes_waiting; |
58 | int r = ioctl(fd, TIOCOUTQ0x5411, &bytes_waiting); |
59 | |
60 | if (!r && !bytes_waiting) /* See note about close(2) below. */ |
61 | return; |
62 | if (r < 0 && errno(*__errno_location ()) == EINTR4) |
63 | continue; |
64 | |
65 | break; |
66 | } |
67 | |
68 | if (UNLIKELY(shutdown(fd, SHUT_WR) < 0)__builtin_expect(((shutdown(fd, SHUT_WR) < 0)), (0))) { |
69 | if (UNLIKELY(errno == ENOTCONN)__builtin_expect((((*__errno_location ()) == 107)), (0))) |
70 | return; |
71 | } |
72 | |
73 | for (int tries = 0; tries < 20; tries++) { |
74 | ssize_t r = read(fd, buffer, DEFAULT_BUFFER_SIZE4096); |
75 | |
76 | if (!r) |
77 | break; |
78 | |
79 | if (r < 0) { |
80 | switch (errno(*__errno_location ())) { |
81 | case EAGAIN11: |
82 | break; |
83 | case EINTR4: |
84 | continue; |
85 | default: |
86 | return; |
87 | } |
88 | } |
89 | |
90 | coro_yield(conn->coro, CONN_CORO_WANT_READ); |
91 | } |
92 | |
93 | /* close(2) will be called when the coroutine yields with CONN_CORO_ABORT */ |
94 | } |
95 | |
96 | __attribute__((noreturn)) static int process_request_coro(struct coro *coro, |
97 | void *data) |
98 | { |
99 | /* NOTE: This function should not return; coro_yield should be used |
100 | * instead. This ensures the storage for `strbuf` is alive when the |
101 | * coroutine ends and lwan_strbuf_free() is called. */ |
102 | struct lwan_connection *conn = data; |
103 | struct lwan *lwan = conn->thread->lwan; |
104 | int fd = lwan_connection_get_fd(lwan, conn); |
105 | enum lwan_request_flags flags = lwan->config.request_flags; |
106 | struct lwan_strbuf strbuf = LWAN_STRBUF_STATIC_INIT(struct lwan_strbuf) { .buffer = "" }; |
107 | char request_buffer[DEFAULT_BUFFER_SIZE4096]; |
108 | struct lwan_value buffer = {.value = request_buffer, .len = 0}; |
109 | char *next_request = NULL((void*)0); |
110 | char *header_start[N_HEADER_START64]; |
111 | struct lwan_proxy proxy; |
112 | const int error_when_n_packets = lwan_calculate_n_packets(DEFAULT_BUFFER_SIZE4096); |
113 | |
114 | coro_defer(coro, lwan_strbuf_free_defer, &strbuf); |
115 | |
116 | const size_t init_gen = 1; /* 1 call to coro_defer() */ |
117 | 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" , 117, __extension__ __PRETTY_FUNCTION__); })); |
118 | |
119 | while (true1) { |
120 | struct lwan_request_parser_helper helper = { |
121 | .buffer = &buffer, |
122 | .next_request = next_request, |
123 | .error_when_n_packets = error_when_n_packets, |
124 | .header_start = header_start, |
125 | }; |
126 | struct lwan_request request = {.conn = conn, |
127 | .global_response_headers = &lwan->headers, |
128 | .fd = fd, |
129 | .response = {.buffer = &strbuf}, |
130 | .flags = flags, |
131 | .proxy = &proxy, |
132 | .helper = &helper}; |
133 | |
134 | lwan_process_request(lwan, &request); |
135 | |
136 | /* Run the deferred instructions now (except those used to initialize |
137 | * the coroutine), so that if the connection is gracefully closed, |
138 | * the storage for ``helper'' is still there. */ |
139 | coro_deferred_run(coro, init_gen); |
140 | |
141 | if (UNLIKELY(!(conn->flags & CONN_IS_KEEP_ALIVE))__builtin_expect(((!(conn->flags & CONN_IS_KEEP_ALIVE) )), (0))) { |
142 | graceful_close(lwan, conn, request_buffer); |
143 | break; |
144 | } |
145 | |
146 | if (next_request && *next_request) { |
147 | conn->flags |= CONN_CORK; |
148 | |
149 | if (!(conn->flags & CONN_EVENTS_WRITE)) |
150 | coro_yield(coro, CONN_CORO_WANT_WRITE); |
151 | } else { |
152 | conn->flags &= ~CONN_CORK; |
153 | coro_yield(coro, CONN_CORO_WANT_READ); |
154 | } |
155 | |
156 | /* Ensure string buffer is reset between requests, and that the backing |
157 | * store isn't over 2KB. */ |
158 | lwan_strbuf_reset_trim(&strbuf, 2048); |
159 | |
160 | /* Only allow flags from config. */ |
161 | flags = request.flags & (REQUEST_PROXIED | REQUEST_ALLOW_CORS); |
162 | next_request = helper.next_request; |
163 | } |
164 | |
165 | coro_yield(coro, CONN_CORO_ABORT); |
166 | __builtin_unreachable(); |
167 | } |
168 | |
169 | static ALWAYS_INLINEinline __attribute__((always_inline)) uint32_t |
170 | conn_flags_to_epoll_events(enum lwan_connection_flags flags) |
171 | { |
172 | static const uint32_t map[CONN_EVENTS_MASK + 1] = { |
173 | [0 /* Suspended (timer or await) */] = EPOLLRDHUPEPOLLRDHUP, |
174 | [CONN_EVENTS_WRITE] = EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, |
175 | [CONN_EVENTS_READ] = EPOLLINEPOLLIN | EPOLLRDHUPEPOLLRDHUP, |
176 | [CONN_EVENTS_READ_WRITE] = EPOLLINEPOLLIN | EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, |
177 | }; |
178 | |
179 | return map[flags & CONN_EVENTS_MASK]; |
180 | } |
181 | |
182 | static void update_epoll_flags(int fd, |
183 | struct lwan_connection *conn, |
184 | int epoll_fd, |
185 | enum lwan_connection_coro_yield yield_result) |
186 | { |
187 | static const enum lwan_connection_flags or_mask[CONN_CORO_MAX] = { |
188 | [CONN_CORO_YIELD] = 0, |
189 | |
190 | [CONN_CORO_WANT_READ_WRITE] = CONN_EVENTS_READ_WRITE, |
191 | [CONN_CORO_WANT_READ] = CONN_EVENTS_READ, |
192 | [CONN_CORO_WANT_WRITE] = CONN_EVENTS_WRITE, |
193 | |
194 | /* While the coro is suspended, we're not interested in either EPOLLIN |
195 | * or EPOLLOUT events. We still want to track this fd in epoll, though, |
196 | * so unset both so that only EPOLLRDHUP (plus the implicitly-set ones) |
197 | * are set. */ |
198 | [CONN_CORO_SUSPEND] = CONN_SUSPENDED, |
199 | |
200 | /* Ideally, when suspending a coroutine, the current flags&CONN_EVENTS_MASK |
201 | * would have to be stored and restored -- however, resuming as if the |
202 | * client coroutine is interested in a write event always guarantees that |
203 | * they'll be resumed as they're TCP sockets. There's a good chance that |
204 | * trying to read from a socket after resuming a coroutine will succeed, |
205 | * but if it doesn't because read() returns -EAGAIN, the I/O wrappers will |
206 | * yield with CONN_CORO_WANT_READ anyway. */ |
207 | [CONN_CORO_RESUME] = CONN_EVENTS_WRITE, |
208 | }; |
209 | static const enum lwan_connection_flags and_mask[CONN_CORO_MAX] = { |
210 | [CONN_CORO_YIELD] = ~0, |
211 | |
212 | [CONN_CORO_WANT_READ_WRITE] = ~0, |
213 | [CONN_CORO_WANT_READ] = ~CONN_EVENTS_WRITE, |
214 | [CONN_CORO_WANT_WRITE] = ~CONN_EVENTS_READ, |
215 | |
216 | [CONN_CORO_SUSPEND] = ~CONN_EVENTS_READ_WRITE, |
217 | [CONN_CORO_RESUME] = ~CONN_SUSPENDED, |
218 | }; |
219 | enum lwan_connection_flags prev_flags = conn->flags; |
220 | |
221 | conn->flags |= or_mask[yield_result]; |
222 | conn->flags &= and_mask[yield_result]; |
223 | |
224 | if (conn->flags == prev_flags) |
225 | return; |
226 | |
227 | struct epoll_event event = { |
228 | .events = conn_flags_to_epoll_events(conn->flags), |
229 | .data.ptr = conn, |
230 | }; |
231 | |
232 | if (UNLIKELY(epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &event) < 0)__builtin_expect(((epoll_ctl(epoll_fd, 3, fd, &event) < 0)), (0))) |
233 | lwan_status_perror("epoll_ctl")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 233, __FUNCTION__, "epoll_ctl"); |
234 | } |
235 | |
236 | static void clear_async_await_flag(void *data) |
237 | { |
238 | struct lwan_connection *async_fd_conn = data; |
239 | |
240 | async_fd_conn->flags &= ~CONN_ASYNC_AWAIT; |
241 | } |
242 | |
243 | static enum lwan_connection_coro_yield |
244 | resume_async(struct timeout_queue *tq, |
245 | enum lwan_connection_coro_yield yield_result, |
246 | int64_t from_coro, |
247 | struct lwan_connection *conn, |
248 | int epoll_fd) |
249 | { |
250 | static const enum lwan_connection_flags to_connection_flags[] = { |
251 | [CONN_CORO_ASYNC_AWAIT_READ] = CONN_EVENTS_READ, |
252 | [CONN_CORO_ASYNC_AWAIT_WRITE] = CONN_EVENTS_WRITE, |
253 | [CONN_CORO_ASYNC_AWAIT_READ_WRITE] = CONN_EVENTS_READ_WRITE, |
254 | }; |
255 | int await_fd = (int)((uint64_t)from_coro >> 32); |
256 | enum lwan_connection_flags flags; |
257 | int op; |
258 | |
259 | 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" , 259, __extension__ __PRETTY_FUNCTION__); })); |
260 | 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" , 261, __extension__ __PRETTY_FUNCTION__); })) |
261 | 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" , 261, __extension__ __PRETTY_FUNCTION__); })); |
262 | |
263 | flags = to_connection_flags[yield_result]; |
264 | |
265 | struct lwan_connection *await_fd_conn = &tq->lwan->conns[await_fd]; |
266 | if (LIKELY(await_fd_conn->flags & CONN_ASYNC_AWAIT)__builtin_expect((!!(await_fd_conn->flags & CONN_ASYNC_AWAIT )), (1))) { |
267 | if (LIKELY((await_fd_conn->flags & CONN_EVENTS_MASK) == flags)__builtin_expect((!!((await_fd_conn->flags & CONN_EVENTS_MASK ) == flags)), (1))) |
268 | return CONN_CORO_SUSPEND; |
269 | |
270 | op = EPOLL_CTL_MOD3; |
271 | } else { |
272 | op = EPOLL_CTL_ADD1; |
273 | flags |= CONN_ASYNC_AWAIT; |
274 | coro_defer(conn->coro, clear_async_await_flag, await_fd_conn); |
275 | } |
276 | |
277 | struct epoll_event event = {.events = conn_flags_to_epoll_events(flags), |
278 | .data.ptr = conn}; |
279 | if (LIKELY(!epoll_ctl(epoll_fd, op, await_fd, &event))__builtin_expect((!!(!epoll_ctl(epoll_fd, op, await_fd, & event))), (1))) { |
280 | await_fd_conn->flags &= ~CONN_EVENTS_MASK; |
281 | await_fd_conn->flags |= flags; |
282 | return CONN_CORO_SUSPEND; |
283 | } |
284 | |
285 | return CONN_CORO_ABORT; |
286 | } |
287 | |
288 | static ALWAYS_INLINEinline __attribute__((always_inline)) void resume_coro(struct timeout_queue *tq, |
289 | struct lwan_connection *conn, |
290 | int epoll_fd) |
291 | { |
292 | 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" , 292, __extension__ __PRETTY_FUNCTION__); })); |
293 | |
294 | int64_t from_coro = coro_resume(conn->coro); |
295 | enum lwan_connection_coro_yield yield_result = from_coro & 0xffffffff; |
296 | |
297 | if (UNLIKELY(yield_result >= CONN_CORO_ASYNC)__builtin_expect(((yield_result >= CONN_CORO_ASYNC)), (0))) |
298 | yield_result = resume_async(tq, yield_result, from_coro, conn, epoll_fd); |
299 | |
300 | if (UNLIKELY(yield_result == CONN_CORO_ABORT)__builtin_expect(((yield_result == CONN_CORO_ABORT)), (0))) |
301 | return timeout_queue_expire(tq, conn); |
302 | |
303 | return update_epoll_flags(lwan_connection_get_fd(tq->lwan, conn), conn, |
304 | epoll_fd, yield_result); |
305 | } |
306 | |
307 | static void update_date_cache(struct lwan_thread *thread) |
308 | { |
309 | time_t now = time(NULL((void*)0)); |
310 | |
311 | lwan_format_rfc_time(now, thread->date.date); |
312 | lwan_format_rfc_time(now + (time_t)thread->lwan->config.expires, |
313 | thread->date.expires); |
314 | } |
315 | |
316 | static ALWAYS_INLINEinline __attribute__((always_inline)) void spawn_coro(struct lwan_connection *conn, |
317 | struct coro_switcher *switcher, |
318 | struct timeout_queue *tq) |
319 | { |
320 | struct lwan_thread *t = conn->thread; |
321 | |
322 | 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" , 322, __extension__ __PRETTY_FUNCTION__); })); |
323 | 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" , 323, __extension__ __PRETTY_FUNCTION__); })); |
324 | 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" , 324, __extension__ __PRETTY_FUNCTION__); })); |
325 | 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" , 325, __extension__ __PRETTY_FUNCTION__); })); |
326 | 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" , 327, __extension__ __PRETTY_FUNCTION__); })) |
327 | (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" , 327, __extension__ __PRETTY_FUNCTION__); })); |
328 | |
329 | *conn = (struct lwan_connection) { |
330 | .coro = coro_new(switcher, process_request_coro, conn), |
331 | .flags = CONN_EVENTS_READ, |
332 | .time_to_expire = tq->current_time + tq->move_to_last_bump, |
333 | .thread = t, |
334 | }; |
335 | if (LIKELY(conn->coro)__builtin_expect((!!(conn->coro)), (1))) { |
336 | timeout_queue_insert(tq, conn); |
337 | return; |
338 | } |
339 | |
340 | /* FIXME: send a "busy" response to this client? we don't have a coroutine |
341 | * at this point, can't use lwan_send() here */ |
342 | 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" , 342, __FUNCTION__, "Could not create coroutine, dropping connection" ); |
343 | |
344 | conn->flags = 0; |
345 | |
346 | int fd = lwan_connection_get_fd(tq->lwan, conn); |
347 | shutdown(fd, SHUT_RDWRSHUT_RDWR); |
348 | close(fd); |
349 | } |
350 | |
351 | static bool_Bool process_pending_timers(struct timeout_queue *tq, |
352 | struct lwan_thread *t, |
353 | int epoll_fd) |
354 | { |
355 | struct timeout *timeout; |
356 | bool_Bool should_expire_timers = false0; |
357 | |
358 | while ((timeout = timeouts_get(t->wheel))) { |
359 | struct lwan_request *request; |
360 | |
361 | if (timeout == &tq->timeout) { |
362 | should_expire_timers = true1; |
363 | continue; |
364 | } |
365 | |
366 | 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)); |
367 | |
368 | update_epoll_flags(request->fd, request->conn, epoll_fd, |
369 | CONN_CORO_RESUME); |
370 | } |
371 | |
372 | if (should_expire_timers) { |
373 | timeout_queue_expire_waiting(tq); |
374 | |
375 | /* tq timeout expires every 1000ms if there are connections, so |
376 | * update the date cache at this point as well. */ |
377 | update_date_cache(t); |
378 | |
379 | if (!timeout_queue_empty(tq)) { |
380 | timeouts_add(t->wheel, &tq->timeout, 1000); |
381 | return true1; |
382 | } |
383 | |
384 | timeouts_del(t->wheel, &tq->timeout); |
385 | } |
386 | |
387 | return false0; |
388 | } |
389 | |
390 | static int |
391 | turn_timer_wheel(struct timeout_queue *tq, struct lwan_thread *t, int epoll_fd) |
392 | { |
393 | const int infinite_timeout = -1; |
394 | timeout_t wheel_timeout; |
395 | struct timespec now; |
396 | |
397 | if (UNLIKELY(clock_gettime(monotonic_clock_id, &now) < 0)__builtin_expect(((clock_gettime(monotonic_clock_id, &now ) < 0)), (0))) |
398 | lwan_status_critical("Could not get monotonic time")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 398, __FUNCTION__, "Could not get monotonic time"); |
399 | |
400 | timeouts_update(t->wheel, |
401 | (timeout_t)(now.tv_sec * 1000 + now.tv_nsec / 1000000)); |
402 | |
403 | /* Check if there's an expired timer. */ |
404 | wheel_timeout = timeouts_timeout(t->wheel); |
405 | if (wheel_timeout > 0) { |
406 | return (int)wheel_timeout; /* No, but will soon. Wake us up in |
407 | wheel_timeout ms. */ |
408 | } |
409 | |
410 | if (UNLIKELY((int64_t)wheel_timeout < 0)__builtin_expect((((int64_t)wheel_timeout < 0)), (0))) |
411 | return infinite_timeout; /* None found. */ |
412 | |
413 | if (!process_pending_timers(tq, t, epoll_fd)) |
414 | return infinite_timeout; /* No more timers to process. */ |
415 | |
416 | /* After processing pending timers, determine when to wake up. */ |
417 | return (int)timeouts_timeout(t->wheel); |
418 | } |
419 | |
420 | static bool_Bool accept_waiting_clients(const struct lwan_thread *t) |
421 | { |
422 | const struct lwan_connection *conns = t->lwan->conns; |
423 | |
424 | while (true1) { |
425 | int fd = |
426 | accept4(t->listen_fd, NULL((void*)0), NULL((void*)0), SOCK_NONBLOCKSOCK_NONBLOCK | SOCK_CLOEXECSOCK_CLOEXEC); |
427 | |
428 | if (LIKELY(fd >= 0)__builtin_expect((!!(fd >= 0)), (1))) { |
429 | const struct lwan_connection *conn = &conns[fd]; |
430 | struct epoll_event ev = { |
431 | .data.ptr = (void *)conn, |
432 | .events = conn_flags_to_epoll_events(CONN_EVENTS_READ), |
433 | }; |
434 | int r = epoll_ctl(conn->thread->epoll_fd, EPOLL_CTL_ADD1, fd, &ev); |
435 | |
436 | if (UNLIKELY(r < 0)__builtin_expect(((r < 0)), (0))) { |
437 | /* FIXME: send a "busy" response here? No coroutine has been |
438 | * created at this point to use the usual stuff, though. */ |
439 | 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" , 441, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ) |
440 | "set %d. Dropping connection",lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 441, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ) |
441 | fd, conn->thread->epoll_fd)lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 441, __FUNCTION__, "Could not add file descriptor %d to epoll " "set %d. Dropping connection", fd, conn->thread->epoll_fd ); |
442 | shutdown(fd, SHUT_RDWRSHUT_RDWR); |
443 | close(fd); |
444 | } |
445 | |
446 | #if defined(HAVE_SO_INCOMING_CPU) && defined(__x86_64__1) |
447 | /* Ignore errors here, as this is just a hint */ |
448 | (void)setsockopt(fd, SOL_SOCKET1, SO_INCOMING_CPU49, &t->cpu, sizeof(t->cpu)); |
449 | #endif |
450 | |
451 | continue; |
452 | } |
453 | |
454 | switch (errno(*__errno_location ())) { |
455 | default: |
456 | lwan_status_perror("Unexpected error while accepting connections")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 456, __FUNCTION__, "Unexpected error while accepting connections" ); |
457 | /* fallthrough */ |
458 | |
459 | case EAGAIN11: |
460 | return true1; |
461 | |
462 | case EBADF9: |
463 | case ECONNABORTED103: |
464 | case EINVAL22: |
465 | lwan_status_info("Listening socket closed")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 465, __FUNCTION__, "Listening socket closed"); |
466 | return false0; |
467 | } |
468 | } |
469 | |
470 | __builtin_unreachable(); |
471 | } |
472 | |
473 | static int create_listen_socket(struct lwan_thread *t, |
474 | unsigned int num, |
475 | unsigned int num_sockets) |
476 | { |
477 | int listen_fd; |
478 | |
479 | listen_fd = lwan_create_listen_socket(t->lwan, num == 0); |
480 | if (listen_fd < 0) |
481 | lwan_status_critical("Could not create listen_fd")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 481, __FUNCTION__, "Could not create listen_fd"); |
482 | |
483 | /* Ignore errors here, as this is just a hint */ |
484 | #if defined(HAVE_SO_ATTACH_REUSEPORT_CBPF) |
485 | /* From socket(7): "These options may be set repeatedly at any time on |
486 | * any socket in the group to replace the current BPF program used by |
487 | * all sockets in the group." */ |
488 | if (num == 0) { |
489 | /* From socket(7): "The BPF program must return an index between 0 and |
490 | * N-1 representing the socket which should receive the packet (where N |
491 | * is the number of sockets in the group)." */ |
492 | const uint32_t cpu_ad_off = (uint32_t)SKF_AD_OFF(-0x1000) + SKF_AD_CPU36; |
493 | struct sock_filter filter[] = { |
494 | {BPF_LD0x00 | BPF_W0x00 | BPF_ABS0x20, 0, 0, cpu_ad_off}, /* A = curr_cpu_index */ |
495 | {BPF_ALU0x04 | BPF_MOD0x90 | BPF_K0x00, 0, 0, num_sockets}, /* A %= num_sockets */ |
496 | {BPF_RET0x06 | BPF_A0x10, 0, 0, 0}, /* return A */ |
497 | }; |
498 | struct sock_fprog fprog = {.filter = filter, .len = N_ELEMENTS(filter)((!sizeof(char[1 - 2 * __builtin_types_compatible_p( __typeof__ (filter), __typeof__(&(filter)[0]))])) | sizeof(filter) / sizeof(filter[0]))}; |
499 | |
500 | if (!(num_sockets & (num_sockets - 1))) { |
501 | /* FIXME: Is this strength reduction already made by the kernel? */ |
502 | filter[1].code &= (uint16_t)~BPF_MOD0x90; |
503 | filter[1].code |= BPF_AND0x50; |
504 | filter[1].k = num_sockets - 1; |
505 | } |
506 | |
507 | (void)setsockopt(listen_fd, SOL_SOCKET1, SO_ATTACH_REUSEPORT_CBPF51, |
508 | &fprog, sizeof(fprog)); |
509 | (void)setsockopt(listen_fd, SOL_SOCKET1, SO_LOCK_FILTER44, |
510 | (int[]){1}, sizeof(int)); |
511 | } |
512 | #elif defined(HAVE_SO_INCOMING_CPU) && defined(__x86_64__1) |
513 | (void)setsockopt(listen_fd, SOL_SOCKET1, SO_INCOMING_CPU49, &t->cpu, |
514 | sizeof(t->cpu)); |
515 | #endif |
516 | |
517 | struct epoll_event event = { |
518 | .events = EPOLLINEPOLLIN | EPOLLETEPOLLET | EPOLLERREPOLLERR, |
519 | .data.ptr = NULL((void*)0), |
520 | }; |
521 | if (epoll_ctl(t->epoll_fd, EPOLL_CTL_ADD1, listen_fd, &event) < 0) |
522 | 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" , 522, __FUNCTION__, "Could not add socket to epoll"); |
523 | |
524 | return listen_fd; |
525 | } |
526 | |
527 | static void *thread_io_loop(void *data) |
528 | { |
529 | struct lwan_thread *t = data; |
530 | int epoll_fd = t->epoll_fd; |
531 | const int max_events = LWAN_MIN((int)t->lwan->thread.max_fd, 1024)({ const __typeof__(((int)t->lwan->thread.max_fd) + 0) lwan_tmp_id4 = ((int)t->lwan->thread.max_fd); const __typeof__((1024 ) + 0) lwan_tmp_id5 = (1024); lwan_tmp_id4 > lwan_tmp_id5 ? lwan_tmp_id5 : lwan_tmp_id4; }); |
532 | struct lwan *lwan = t->lwan; |
533 | struct epoll_event *events; |
534 | struct coro_switcher switcher; |
535 | struct timeout_queue tq; |
536 | |
537 | lwan_status_debug("Worker thread #%zd starting",lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 538, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1) |
538 | t - t->lwan->thread.threads + 1)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 538, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1); |
539 | lwan_set_thread_name("worker"); |
540 | |
541 | events = calloc((size_t)max_events, sizeof(*events)); |
542 | if (UNLIKELY(!events)__builtin_expect(((!events)), (0))) |
543 | 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" , 543, __FUNCTION__, "Could not allocate memory for events"); |
544 | |
545 | update_date_cache(t); |
546 | |
547 | timeout_queue_init(&tq, lwan); |
548 | |
549 | pthread_barrier_wait(&lwan->thread.barrier); |
550 | |
551 | for (;;) { |
552 | int timeout = turn_timer_wheel(&tq, t, epoll_fd); |
553 | int n_fds = epoll_wait(epoll_fd, events, max_events, timeout); |
554 | bool_Bool accepted_connections = false0; |
555 | |
556 | if (UNLIKELY(n_fds < 0)__builtin_expect(((n_fds < 0)), (0))) { |
557 | if (errno(*__errno_location ()) == EBADF9 || errno(*__errno_location ()) == EINVAL22) |
558 | break; |
559 | continue; |
560 | } |
561 | |
562 | for (struct epoll_event *event = events; n_fds--; event++) { |
563 | struct lwan_connection *conn; |
564 | |
565 | if (!event->data.ptr) { |
566 | if (LIKELY(accept_waiting_clients(t))__builtin_expect((!!(accept_waiting_clients(t))), (1))) { |
567 | accepted_connections = true1; |
568 | continue; |
569 | } |
570 | close(epoll_fd); |
571 | epoll_fd = -1; |
572 | break; |
573 | } |
574 | |
575 | conn = event->data.ptr; |
576 | |
577 | if (UNLIKELY(event->events & (EPOLLRDHUP | EPOLLHUP))__builtin_expect(((event->events & (EPOLLRDHUP | EPOLLHUP ))), (0))) { |
578 | timeout_queue_expire(&tq, conn); |
579 | continue; |
580 | } |
581 | |
582 | if (!conn->coro) { |
583 | spawn_coro(conn, &switcher, &tq); |
584 | continue; |
585 | } |
586 | |
587 | resume_coro(&tq, conn, epoll_fd); |
588 | timeout_queue_move_to_last(&tq, conn); |
589 | } |
590 | |
591 | if (accepted_connections) { |
592 | timeouts_add(t->wheel, &tq.timeout, 1000); |
593 | accepted_connections = false0; |
Value stored to 'accepted_connections' is never read | |
594 | } |
595 | } |
596 | |
597 | pthread_barrier_wait(&lwan->thread.barrier); |
598 | |
599 | timeout_queue_expire_all(&tq); |
600 | free(events); |
601 | |
602 | return NULL((void*)0); |
603 | } |
604 | |
605 | static void create_thread(struct lwan *l, struct lwan_thread *thread) |
606 | { |
607 | int ignore; |
608 | pthread_attr_t attr; |
609 | |
610 | thread->lwan = l; |
611 | |
612 | thread->wheel = timeouts_open(&ignore); |
613 | if (!thread->wheel) |
614 | lwan_status_critical("Could not create timer wheel")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 614, __FUNCTION__, "Could not create timer wheel"); |
615 | |
616 | if ((thread->epoll_fd = epoll_create1(EPOLL_CLOEXECEPOLL_CLOEXEC)) < 0) |
617 | lwan_status_critical_perror("epoll_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 617, __FUNCTION__, "epoll_create"); |
618 | |
619 | if (pthread_attr_init(&attr)) |
620 | lwan_status_critical_perror("pthread_attr_init")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 620, __FUNCTION__, "pthread_attr_init"); |
621 | |
622 | if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEMPTHREAD_SCOPE_SYSTEM)) |
623 | lwan_status_critical_perror("pthread_attr_setscope")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 623, __FUNCTION__, "pthread_attr_setscope"); |
624 | |
625 | if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLEPTHREAD_CREATE_JOINABLE)) |
626 | lwan_status_critical_perror("pthread_attr_setdetachstate")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 626, __FUNCTION__, "pthread_attr_setdetachstate"); |
627 | |
628 | if (pthread_create(&thread->self, &attr, thread_io_loop, thread)) |
629 | lwan_status_critical_perror("pthread_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 629, __FUNCTION__, "pthread_create"); |
630 | |
631 | if (pthread_attr_destroy(&attr)) |
632 | lwan_status_critical_perror("pthread_attr_destroy")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 632, __FUNCTION__, "pthread_attr_destroy"); |
633 | } |
634 | |
635 | #if defined(__linux__1) && defined(__x86_64__1) |
636 | static bool_Bool read_cpu_topology(struct lwan *l, uint32_t siblings[]) |
637 | { |
638 | char path[PATH_MAX4096]; |
639 | |
640 | for (uint32_t i = 0; i < l->available_cpus; i++) |
641 | siblings[i] = 0xbebacafe; |
642 | |
643 | for (unsigned int i = 0; i < l->available_cpus; i++) { |
644 | FILE *sib; |
645 | uint32_t id, sibling; |
646 | char separator; |
647 | |
648 | snprintf(path, sizeof(path), |
649 | "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list", |
650 | i); |
651 | |
652 | sib = fopen(path, "re"); |
653 | if (!sib) { |
654 | 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" , 655, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path) |
655 | path)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 655, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path); |
656 | return false0; |
657 | } |
658 | |
659 | switch (fscanf(sib, "%u%c%u", &id, &separator, &sibling)) { |
660 | case 2: /* No SMT */ |
661 | siblings[i] = id; |
662 | break; |
663 | case 3: /* SMT */ |
664 | if (!(separator == ',' || separator == '-')) { |
665 | 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" , 665, __FUNCTION__, "Expecting either ',' or '-' for sibling separator" ); |
666 | __builtin_unreachable(); |
667 | } |
668 | |
669 | siblings[i] = sibling; |
670 | break; |
671 | default: |
672 | lwan_status_critical("%s has invalid format", path)lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 672, __FUNCTION__, "%s has invalid format", path); |
673 | __builtin_unreachable(); |
674 | } |
675 | |
676 | fclose(sib); |
677 | } |
678 | |
679 | /* Perform a sanity check here, as some systems seem to filter out the |
680 | * result of sysconf() to obtain the number of configured and online |
681 | * CPUs but don't bother changing what's available through sysfs as far |
682 | * as the CPU topology information goes. It's better to fall back to a |
683 | * possibly non-optimal setup than just crash during startup while |
684 | * trying to perform an out-of-bounds array access. */ |
685 | for (unsigned int i = 0; i < l->available_cpus; i++) { |
686 | if (siblings[i] == 0xbebacafe) { |
687 | 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" , 687, __FUNCTION__, "Could not determine sibling for CPU %d" , i); |
688 | return false0; |
689 | } |
690 | |
691 | if (siblings[i] >= l->available_cpus) { |
692 | 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" , 695, __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) |
693 | "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" , 695, __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) |
694 | "Is Lwan running in a (broken) container?",lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 695, __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) |
695 | siblings[i], l->available_cpus, l->online_cpus)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 695, __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); |
696 | return false0; |
697 | } |
698 | } |
699 | |
700 | return true1; |
701 | } |
702 | |
703 | static void |
704 | siblings_to_schedtbl(struct lwan *l, uint32_t siblings[], uint32_t schedtbl[]) |
705 | { |
706 | int *seen = alloca(l->available_cpus * sizeof(int))__builtin_alloca (l->available_cpus * sizeof(int)); |
707 | unsigned int n_schedtbl = 0; |
708 | |
709 | for (uint32_t i = 0; i < l->available_cpus; i++) |
710 | seen[i] = -1; |
711 | |
712 | for (uint32_t i = 0; i < l->available_cpus; i++) { |
713 | if (seen[siblings[i]] < 0) { |
714 | seen[siblings[i]] = (int)i; |
715 | } else { |
716 | schedtbl[n_schedtbl++] = (uint32_t)seen[siblings[i]]; |
717 | schedtbl[n_schedtbl++] = i; |
718 | } |
719 | } |
720 | |
721 | if (n_schedtbl != l->available_cpus) |
722 | memcpy(schedtbl, seen, l->available_cpus * sizeof(int)); |
723 | } |
724 | |
725 | static bool_Bool |
726 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) |
727 | { |
728 | uint32_t *siblings = alloca(l->available_cpus * sizeof(uint32_t))__builtin_alloca (l->available_cpus * sizeof(uint32_t)); |
729 | |
730 | if (read_cpu_topology(l, siblings)) { |
731 | uint32_t *affinity = alloca(l->available_cpus * sizeof(uint32_t))__builtin_alloca (l->available_cpus * sizeof(uint32_t)); |
732 | |
733 | siblings_to_schedtbl(l, siblings, affinity); |
734 | |
735 | for (uint32_t i = 0; i < n_threads; i++) |
736 | schedtbl[i] = affinity[i % l->available_cpus]; |
737 | return true1; |
738 | } |
739 | |
740 | for (uint32_t i = 0; i < n_threads; i++) |
741 | schedtbl[i] = (i / 2) % l->thread.count; |
742 | return false0; |
743 | } |
744 | |
745 | static void |
746 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t mask) |
747 | { |
748 | for (uint32_t i = 0; i < l->thread.count; i++) { |
749 | cpu_set_t set; |
750 | |
751 | CPU_ZERO(&set)do __builtin_memset (&set, '\0', sizeof (cpu_set_t)); while (0); |
752 | 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; })); |
753 | |
754 | if (pthread_setaffinity_np(l->thread.threads[i].self, sizeof(set), |
755 | &set)) |
756 | 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" , 756, __FUNCTION__, "Could not set affinity for thread %d", i ); |
757 | } |
758 | } |
759 | #elif defined(__x86_64__1) |
760 | static bool_Bool |
761 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) |
762 | { |
763 | for (uint32_t i = 0; i < n_threads; i++) |
764 | schedtbl[i] = (i / 2) % l->thread.count; |
765 | return false0; |
766 | } |
767 | |
768 | static void |
769 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t n) |
770 | { |
771 | } |
772 | #endif |
773 | |
774 | void lwan_thread_init(struct lwan *l) |
775 | { |
776 | const unsigned int total_conns = l->thread.max_fd * l->thread.count; |
777 | |
778 | if (pthread_barrier_init(&l->thread.barrier, NULL((void*)0), |
779 | (unsigned)l->thread.count + 1)) |
780 | lwan_status_critical("Could not create barrier")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 780, __FUNCTION__, "Could not create barrier"); |
781 | |
782 | lwan_status_debug("Initializing threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 782, __FUNCTION__, "Initializing threads"); |
783 | |
784 | l->thread.threads = |
785 | calloc((size_t)l->thread.count, sizeof(struct lwan_thread)); |
786 | if (!l->thread.threads) |
787 | 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" , 787, __FUNCTION__, "Could not allocate memory for threads"); |
788 | |
789 | #ifdef __x86_64__1 |
790 | 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; })] |
791 | "Two connections per cache line")extern int (*__Static_assert_function (void)) [!!sizeof (struct { int __error_if_negative: (sizeof(struct lwan_connection) == 32) ? 2 : -1; })]; |
792 | #ifdef _SC_LEVEL1_DCACHE_LINESIZE_SC_LEVEL1_DCACHE_LINESIZE |
793 | 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" , 793, __extension__ __PRETTY_FUNCTION__); })); |
794 | #endif |
795 | |
796 | 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" , 798, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus) |
797 | "Reading topology to pre-schedule clients",lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 798, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus) |
798 | l->online_cpus, l->available_cpus)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 798, __FUNCTION__, "%d CPUs of %d are online. " "Reading topology to pre-schedule clients" , l->online_cpus, l->available_cpus); |
799 | |
800 | /* |
801 | * Pre-schedule each file descriptor, to reduce some operations in the |
802 | * fast path. |
803 | * |
804 | * Since struct lwan_connection is guaranteed to be 32-byte long, two of |
805 | * them can fill up a cache line. Assume siblings share cache lines and |
806 | * use the CPU topology to group two connections per cache line in such |
807 | * a way that false sharing is avoided. |
808 | */ |
809 | uint32_t n_threads = (uint32_t)lwan_nextpow2((size_t)((l->thread.count - 1) * 2)); |
810 | uint32_t *schedtbl = alloca(n_threads * sizeof(uint32_t))__builtin_alloca (n_threads * sizeof(uint32_t)); |
811 | |
812 | bool_Bool adj_affinity = topology_to_schedtbl(l, schedtbl, n_threads); |
813 | |
814 | n_threads--; /* Transform count into mask for AND below */ |
815 | |
816 | if (adj_affinity) { |
817 | /* Save which CPU this tread will be pinned at so we can use |
818 | * SO_INCOMING_CPU later. */ |
819 | for (unsigned int i = 0; i < l->thread.count; i++) |
820 | l->thread.threads[i].cpu = schedtbl[i & n_threads]; |
821 | } |
822 | |
823 | for (unsigned int i = 0; i < total_conns; i++) |
824 | l->conns[i].thread = &l->thread.threads[schedtbl[i & n_threads]]; |
825 | #else |
826 | for (unsigned int i = 0; i < l->thread.count; i++) |
827 | l->thread.threads[i].cpu = i % l->online_cpus; |
828 | for (unsigned int i = 0; i < total_conns; i++) |
829 | l->conns[i].thread = &l->thread.threads[i % l->thread.count]; |
830 | #endif |
831 | |
832 | for (unsigned int i = 0; i < l->thread.count; i++) { |
833 | struct lwan_thread *thread = &l->thread.threads[i]; |
834 | |
835 | create_thread(l, thread); |
836 | |
837 | if ((thread->listen_fd = create_listen_socket(thread, i, l->thread.count)) < 0) |
838 | 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" , 838, __FUNCTION__, "Could not create listening socket"); |
839 | } |
840 | |
841 | #ifdef __x86_64__1 |
842 | if (adj_affinity) |
843 | adjust_threads_affinity(l, schedtbl, n_threads); |
844 | #endif |
845 | |
846 | pthread_barrier_wait(&l->thread.barrier); |
847 | |
848 | 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" , 848, __FUNCTION__, "Worker threads created and ready to serve" ); |
849 | } |
850 | |
851 | void lwan_thread_shutdown(struct lwan *l) |
852 | { |
853 | lwan_status_debug("Shutting down threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 853, __FUNCTION__, "Shutting down threads"); |
854 | |
855 | for (unsigned int i = 0; i < l->thread.count; i++) { |
856 | struct lwan_thread *t = &l->thread.threads[i]; |
857 | int epoll_fd = t->epoll_fd; |
858 | int listen_fd = t->listen_fd; |
859 | |
860 | t->listen_fd = -1; |
861 | t->epoll_fd = -1; |
862 | close(epoll_fd); |
863 | close(listen_fd); |
864 | } |
865 | |
866 | pthread_barrier_wait(&l->thread.barrier); |
867 | pthread_barrier_destroy(&l->thread.barrier); |
868 | |
869 | for (unsigned int i = 0; i < l->thread.count; i++) { |
870 | struct lwan_thread *t = &l->thread.threads[i]; |
871 | |
872 | pthread_join(l->thread.threads[i].self, NULL((void*)0)); |
873 | timeouts_close(t->wheel); |
874 | } |
875 | |
876 | free(l->thread.threads); |
877 | } |