File: | lwan-thread.c |
Warning: | line 653, column 25 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 | #if defined(HAVE_EVENTFD) | |||
35 | #include <sys/eventfd.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 EINTR4: | |||
82 | continue; | |||
83 | case EAGAIN11: | |||
84 | coro_yield(conn->coro, CONN_CORO_WANT_READ); | |||
85 | continue; | |||
86 | default: | |||
87 | return; | |||
88 | } | |||
89 | } | |||
90 | ||||
91 | coro_yield(conn->coro, CONN_CORO_YIELD); | |||
92 | } | |||
93 | ||||
94 | /* close(2) will be called when the coroutine yields with CONN_CORO_ABORT */ | |||
95 | } | |||
96 | ||||
97 | __attribute__((noreturn)) static int process_request_coro(struct coro *coro, | |||
98 | void *data) | |||
99 | { | |||
100 | /* NOTE: This function should not return; coro_yield should be used | |||
101 | * instead. This ensures the storage for `strbuf` is alive when the | |||
102 | * coroutine ends and lwan_strbuf_free() is called. */ | |||
103 | struct lwan_connection *conn = data; | |||
104 | struct lwan *lwan = conn->thread->lwan; | |||
105 | int fd = lwan_connection_get_fd(lwan, conn); | |||
106 | enum lwan_request_flags flags = lwan->config.request_flags; | |||
107 | struct lwan_strbuf strbuf = LWAN_STRBUF_STATIC_INIT(struct lwan_strbuf) { .buffer = "" }; | |||
108 | char request_buffer[DEFAULT_BUFFER_SIZE4096]; | |||
109 | struct lwan_value buffer = {.value = request_buffer, .len = 0}; | |||
110 | char *next_request = NULL((void*)0); | |||
111 | struct lwan_proxy proxy; | |||
112 | ||||
113 | coro_defer(coro, lwan_strbuf_free_defer, &strbuf); | |||
114 | ||||
115 | const size_t init_gen = 1; /* 1 call to coro_defer() */ | |||
116 | 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" , 116, __extension__ __PRETTY_FUNCTION__); })); | |||
117 | ||||
118 | while (true1) { | |||
119 | struct lwan_request request = {.conn = conn, | |||
120 | .fd = fd, | |||
121 | .response = {.buffer = &strbuf}, | |||
122 | .flags = flags, | |||
123 | .proxy = &proxy}; | |||
124 | ||||
125 | next_request = | |||
126 | lwan_process_request(lwan, &request, &buffer, next_request); | |||
127 | ||||
128 | if (coro_deferred_get_generation(coro) > ((2 * LWAN_ARRAY_INCREMENT16) / 3)) { | |||
129 | /* Batch execution of coro_defers() up to 2/3 LWAN_ARRAY_INCREMENT times, | |||
130 | * to avoid moving deferred array to heap in most cases. (This is to give | |||
131 | * some slack to the next request being processed by this coro.) */ | |||
132 | coro_deferred_run(coro, init_gen); | |||
133 | } | |||
134 | ||||
135 | if (LIKELY(conn->flags & CONN_IS_KEEP_ALIVE)__builtin_expect((!!(conn->flags & CONN_IS_KEEP_ALIVE) ), (1))) { | |||
136 | if (next_request && *next_request) { | |||
137 | conn->flags |= CONN_CORK; | |||
138 | coro_yield(coro, CONN_CORO_WANT_WRITE); | |||
139 | } else { | |||
140 | conn->flags &= ~CONN_CORK; | |||
141 | coro_yield(coro, CONN_CORO_WANT_READ); | |||
142 | } | |||
143 | } else { | |||
144 | graceful_close(lwan, conn, request_buffer); | |||
145 | break; | |||
146 | } | |||
147 | ||||
148 | lwan_strbuf_reset(&strbuf); | |||
149 | ||||
150 | /* Only allow flags from config. */ | |||
151 | flags = request.flags & (REQUEST_PROXIED | REQUEST_ALLOW_CORS); | |||
152 | } | |||
153 | ||||
154 | coro_yield(coro, CONN_CORO_ABORT); | |||
155 | __builtin_unreachable(); | |||
156 | } | |||
157 | ||||
158 | #undef REQUEST_FLAG | |||
159 | ||||
160 | static ALWAYS_INLINEinline __attribute__((always_inline)) uint32_t | |||
161 | conn_flags_to_epoll_events(enum lwan_connection_flags flags) | |||
162 | { | |||
163 | static const uint32_t map[CONN_EVENTS_MASK + 1] = { | |||
164 | [0 /* Suspended (timer or await) */] = EPOLLRDHUPEPOLLRDHUP, | |||
165 | [CONN_EVENTS_WRITE] = EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, | |||
166 | [CONN_EVENTS_READ] = EPOLLINEPOLLIN | EPOLLRDHUPEPOLLRDHUP, | |||
167 | [CONN_EVENTS_READ_WRITE] = EPOLLINEPOLLIN | EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP, | |||
168 | [CONN_EVENTS_ASYNC_READ] = EPOLLETEPOLLET | EPOLLINEPOLLIN | EPOLLRDHUPEPOLLRDHUP | EPOLLONESHOTEPOLLONESHOT, | |||
169 | [CONN_EVENTS_ASYNC_WRITE] = EPOLLETEPOLLET | EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP | EPOLLONESHOTEPOLLONESHOT, | |||
170 | [CONN_EVENTS_ASYNC_READ_WRITE] = EPOLLETEPOLLET | EPOLLINEPOLLIN | EPOLLOUTEPOLLOUT | EPOLLRDHUPEPOLLRDHUP | EPOLLONESHOTEPOLLONESHOT, | |||
171 | }; | |||
172 | ||||
173 | return map[flags & CONN_EVENTS_MASK]; | |||
174 | } | |||
175 | ||||
176 | #if defined(__linux__1) | |||
177 | # define CONN_EVENTS_RESUMECONN_EVENTS_READ_WRITE CONN_EVENTS_READ_WRITE | |||
178 | #else | |||
179 | /* Kqueue doesn't like when you filter on both read and write, so | |||
180 | * wait only on write when resuming a coro suspended by a timer. | |||
181 | * The I/O wrappers should yield if trying to read without anything | |||
182 | * in the buffer, changing the filter to only read, so this is OK. */ | |||
183 | # define CONN_EVENTS_RESUMECONN_EVENTS_READ_WRITE CONN_EVENTS_WRITE | |||
184 | #endif | |||
185 | ||||
186 | static void update_epoll_flags(int fd, | |||
187 | struct lwan_connection *conn, | |||
188 | int epoll_fd, | |||
189 | enum lwan_connection_coro_yield yield_result) | |||
190 | { | |||
191 | static const enum lwan_connection_flags or_mask[CONN_CORO_MAX] = { | |||
192 | [CONN_CORO_YIELD] = 0, | |||
193 | ||||
194 | [CONN_CORO_WANT_READ_WRITE] = CONN_EVENTS_READ_WRITE, | |||
195 | [CONN_CORO_WANT_READ] = CONN_EVENTS_READ, | |||
196 | [CONN_CORO_WANT_WRITE] = CONN_EVENTS_WRITE, | |||
197 | ||||
198 | /* While the coro is suspended, we're not interested in either EPOLLIN | |||
199 | * or EPOLLOUT events. We still want to track this fd in epoll, though, | |||
200 | * so unset both so that only EPOLLRDHUP (plus the implicitly-set ones) | |||
201 | * are set. */ | |||
202 | [CONN_CORO_SUSPEND_TIMER] = CONN_SUSPENDED_TIMER, | |||
203 | [CONN_CORO_SUSPEND_ASYNC_AWAIT] = CONN_SUSPENDED_ASYNC_AWAIT, | |||
204 | ||||
205 | /* Either EPOLLIN or EPOLLOUT have to be set here. There's no need to | |||
206 | * know which event, because they were both cleared when the coro was | |||
207 | * suspended. So set both flags here. This works because EPOLLET isn't | |||
208 | * used. */ | |||
209 | [CONN_CORO_RESUME] = CONN_EVENTS_RESUMECONN_EVENTS_READ_WRITE, | |||
210 | ||||
211 | [CONN_CORO_ASYNC_AWAIT_READ] = CONN_EVENTS_ASYNC_READ, | |||
212 | [CONN_CORO_ASYNC_AWAIT_WRITE] = CONN_EVENTS_ASYNC_WRITE, | |||
213 | [CONN_CORO_ASYNC_AWAIT_READ_WRITE] = CONN_EVENTS_ASYNC_READ_WRITE, | |||
214 | }; | |||
215 | static const enum lwan_connection_flags and_mask[CONN_CORO_MAX] = { | |||
216 | [CONN_CORO_YIELD] = ~0, | |||
217 | ||||
218 | [CONN_CORO_WANT_READ_WRITE] = ~0, | |||
219 | [CONN_CORO_WANT_READ] = ~CONN_EVENTS_WRITE, | |||
220 | [CONN_CORO_WANT_WRITE] = ~CONN_EVENTS_READ, | |||
221 | ||||
222 | [CONN_CORO_SUSPEND_TIMER] = ~(CONN_EVENTS_READ_WRITE | CONN_SUSPENDED_ASYNC_AWAIT), | |||
223 | [CONN_CORO_SUSPEND_ASYNC_AWAIT] = ~(CONN_EVENTS_READ_WRITE | CONN_SUSPENDED_TIMER), | |||
224 | [CONN_CORO_RESUME] = ~CONN_SUSPENDED, | |||
225 | ||||
226 | [CONN_CORO_ASYNC_AWAIT_READ] = ~0, | |||
227 | [CONN_CORO_ASYNC_AWAIT_WRITE] = ~0, | |||
228 | [CONN_CORO_ASYNC_AWAIT_READ_WRITE] = ~0, | |||
229 | }; | |||
230 | enum lwan_connection_flags prev_flags = conn->flags; | |||
231 | ||||
232 | conn->flags |= or_mask[yield_result]; | |||
233 | conn->flags &= and_mask[yield_result]; | |||
234 | ||||
235 | if (conn->flags == prev_flags) | |||
236 | return; | |||
237 | ||||
238 | struct epoll_event event = { | |||
239 | .events = conn_flags_to_epoll_events(conn->flags), | |||
240 | .data.ptr = conn, | |||
241 | }; | |||
242 | ||||
243 | if (UNLIKELY(epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &event) < 0)__builtin_expect(((epoll_ctl(epoll_fd, 3, fd, &event) < 0)), (0))) | |||
244 | lwan_status_perror("epoll_ctl")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 244, __FUNCTION__, "epoll_ctl"); | |||
245 | } | |||
246 | ||||
247 | static ALWAYS_INLINEinline __attribute__((always_inline)) void resume_coro(struct timeout_queue *tq, | |||
248 | struct lwan_connection *conn, | |||
249 | int epoll_fd) | |||
250 | { | |||
251 | 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" , 251, __extension__ __PRETTY_FUNCTION__); })); | |||
252 | ||||
253 | int64_t from_coro = coro_resume(conn->coro); | |||
254 | enum lwan_connection_coro_yield yield_result = from_coro & 0xffffffff; | |||
255 | ||||
256 | if (UNLIKELY(yield_result == CONN_CORO_ABORT)__builtin_expect(((yield_result == CONN_CORO_ABORT)), (0))) | |||
257 | return timeout_queue_expire(tq, conn); | |||
258 | ||||
259 | if (UNLIKELY(yield_result >= CONN_CORO_ASYNC)__builtin_expect(((yield_result >= CONN_CORO_ASYNC)), (0))) { | |||
260 | assert(yield_result >= CONN_CORO_ASYNC_AWAIT_READ &&((void) sizeof ((yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME) ? 1 : 0 ), __extension__ ({ if (yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME) ; else __assert_fail ("yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 261, __extension__ __PRETTY_FUNCTION__); })) | |||
261 | yield_result <= CONN_CORO_ASYNC_RESUME)((void) sizeof ((yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME) ? 1 : 0 ), __extension__ ({ if (yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME) ; else __assert_fail ("yield_result >= CONN_CORO_ASYNC_AWAIT_READ && yield_result <= CONN_CORO_ASYNC_RESUME" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 261, __extension__ __PRETTY_FUNCTION__); })); | |||
262 | ||||
263 | static const enum lwan_connection_flags to_connection_flags[] = { | |||
264 | [CONN_CORO_ASYNC_AWAIT_READ] = CONN_EVENTS_ASYNC_READ, | |||
265 | [CONN_CORO_ASYNC_AWAIT_WRITE] = CONN_EVENTS_ASYNC_WRITE, | |||
266 | [CONN_CORO_ASYNC_AWAIT_READ_WRITE] = CONN_EVENTS_ASYNC_READ_WRITE, | |||
267 | [CONN_CORO_ASYNC_RESUME] = 0, | |||
268 | }; | |||
269 | struct epoll_event event = { | |||
270 | .events = | |||
271 | conn_flags_to_epoll_events(to_connection_flags[yield_result]), | |||
272 | .data.ptr = conn, | |||
273 | }; | |||
274 | int await_fd = (int)((uint64_t)from_coro >> 32); | |||
275 | int op; | |||
276 | ||||
277 | assert(event.events != 0)((void) sizeof ((event.events != 0) ? 1 : 0), __extension__ ( { if (event.events != 0) ; else __assert_fail ("event.events != 0" , "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 277, __extension__ __PRETTY_FUNCTION__); })); | |||
278 | 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" , 278, __extension__ __PRETTY_FUNCTION__); })); | |||
279 | ||||
280 | if (yield_result == CONN_CORO_ASYNC_RESUME) { | |||
281 | op = EPOLL_CTL_DEL2; | |||
282 | yield_result = CONN_CORO_RESUME; | |||
283 | } else { | |||
284 | op = EPOLL_CTL_ADD1; | |||
285 | yield_result = CONN_CORO_SUSPEND_ASYNC_AWAIT; | |||
286 | } | |||
287 | ||||
288 | if (UNLIKELY(epoll_ctl(epoll_fd, op, await_fd, &event) < 0)__builtin_expect(((epoll_ctl(epoll_fd, op, await_fd, &event ) < 0)), (0))) | |||
289 | lwan_status_perror("epoll_ctl")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 289, __FUNCTION__, "epoll_ctl"); | |||
290 | } | |||
291 | ||||
292 | return update_epoll_flags(lwan_connection_get_fd(tq->lwan, conn), conn, | |||
293 | epoll_fd, yield_result); | |||
294 | } | |||
295 | ||||
296 | static void update_date_cache(struct lwan_thread *thread) | |||
297 | { | |||
298 | time_t now = time(NULL((void*)0)); | |||
299 | ||||
300 | lwan_format_rfc_time(now, thread->date.date); | |||
301 | lwan_format_rfc_time(now + (time_t)thread->lwan->config.expires, | |||
302 | thread->date.expires); | |||
303 | } | |||
304 | ||||
305 | static ALWAYS_INLINEinline __attribute__((always_inline)) void spawn_coro(struct lwan_connection *conn, | |||
306 | struct coro_switcher *switcher, | |||
307 | struct timeout_queue *tq) | |||
308 | { | |||
309 | struct lwan_thread *t = conn->thread; | |||
310 | ||||
311 | 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" , 311, __extension__ __PRETTY_FUNCTION__); })); | |||
312 | 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" , 312, __extension__ __PRETTY_FUNCTION__); })); | |||
313 | 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" , 313, __extension__ __PRETTY_FUNCTION__); })); | |||
314 | 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" , 315, __extension__ __PRETTY_FUNCTION__); })) | |||
315 | (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" , 315, __extension__ __PRETTY_FUNCTION__); })); | |||
316 | ||||
317 | *conn = (struct lwan_connection) { | |||
318 | .coro = coro_new(switcher, process_request_coro, conn), | |||
319 | .flags = CONN_EVENTS_READ, | |||
320 | .time_to_expire = tq->current_time + tq->move_to_last_bump, | |||
321 | .thread = t, | |||
322 | }; | |||
323 | if (UNLIKELY(!conn->coro)__builtin_expect(((!conn->coro)), (0))) { | |||
324 | conn->flags = 0; | |||
325 | lwan_status_error("Could not create coroutine")lwan_status_error_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 325, __FUNCTION__, "Could not create coroutine"); | |||
326 | return; | |||
327 | } | |||
328 | ||||
329 | timeout_queue_insert(tq, conn); | |||
330 | } | |||
331 | ||||
332 | static void accept_nudge(int pipe_fd, | |||
333 | struct lwan_thread *t, | |||
334 | struct lwan_connection *conns, | |||
335 | struct timeout_queue *tq, | |||
336 | struct coro_switcher *switcher, | |||
337 | int epoll_fd) | |||
338 | { | |||
339 | uint64_t event; | |||
340 | int new_fd; | |||
341 | ||||
342 | /* Errors are ignored here as pipe_fd serves just as a way to wake the | |||
343 | * thread from epoll_wait(). It's fine to consume the queue at this | |||
344 | * point, regardless of the error type. */ | |||
345 | (void)read(pipe_fd, &event, sizeof(event)); | |||
346 | ||||
347 | while (spsc_queue_pop(&t->pending_fds, &new_fd)) { | |||
348 | struct lwan_connection *conn = &conns[new_fd]; | |||
349 | struct epoll_event ev = { | |||
350 | .data.ptr = conn, | |||
351 | .events = conn_flags_to_epoll_events(CONN_EVENTS_READ), | |||
352 | }; | |||
353 | ||||
354 | if (LIKELY(!epoll_ctl(epoll_fd, EPOLL_CTL_ADD, new_fd, &ev))__builtin_expect((!!(!epoll_ctl(epoll_fd, 1, new_fd, &ev) )), (1))) | |||
355 | spawn_coro(conn, switcher, tq); | |||
356 | } | |||
357 | ||||
358 | timeouts_add(t->wheel, &tq->timeout, 1000); | |||
359 | } | |||
360 | ||||
361 | static bool_Bool process_pending_timers(struct timeout_queue *tq, | |||
362 | struct lwan_thread *t, | |||
363 | int epoll_fd) | |||
364 | { | |||
365 | struct timeout *timeout; | |||
366 | bool_Bool should_expire_timers = false0; | |||
367 | ||||
368 | while ((timeout = timeouts_get(t->wheel))) { | |||
369 | struct lwan_request *request; | |||
370 | ||||
371 | if (timeout == &tq->timeout) { | |||
372 | should_expire_timers = true1; | |||
373 | continue; | |||
374 | } | |||
375 | ||||
376 | 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)); | |||
377 | ||||
378 | update_epoll_flags(request->fd, request->conn, epoll_fd, | |||
379 | CONN_CORO_RESUME); | |||
380 | } | |||
381 | ||||
382 | if (should_expire_timers) { | |||
383 | timeout_queue_expire_waiting(tq); | |||
384 | ||||
385 | /* tq timeout expires every 1000ms if there are connections, so | |||
386 | * update the date cache at this point as well. */ | |||
387 | update_date_cache(t); | |||
388 | ||||
389 | if (!timeout_queue_empty(tq)) { | |||
390 | timeouts_add(t->wheel, &tq->timeout, 1000); | |||
391 | return true1; | |||
392 | } | |||
393 | ||||
394 | timeouts_del(t->wheel, &tq->timeout); | |||
395 | } | |||
396 | ||||
397 | return false0; | |||
398 | } | |||
399 | ||||
400 | static int | |||
401 | turn_timer_wheel(struct timeout_queue *tq, struct lwan_thread *t, int epoll_fd) | |||
402 | { | |||
403 | timeout_t wheel_timeout; | |||
404 | struct timespec now; | |||
405 | ||||
406 | if (UNLIKELY(clock_gettime(monotonic_clock_id, &now) < 0)__builtin_expect(((clock_gettime(monotonic_clock_id, &now ) < 0)), (0))) | |||
407 | lwan_status_critical("Could not get monotonic time")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 407, __FUNCTION__, "Could not get monotonic time"); | |||
408 | ||||
409 | timeouts_update(t->wheel, | |||
410 | (timeout_t)(now.tv_sec * 1000 + now.tv_nsec / 1000000)); | |||
411 | ||||
412 | wheel_timeout = timeouts_timeout(t->wheel); | |||
413 | if (UNLIKELY((int64_t)wheel_timeout < 0)__builtin_expect((((int64_t)wheel_timeout < 0)), (0))) | |||
414 | goto infinite_timeout; | |||
415 | ||||
416 | if (wheel_timeout == 0) { | |||
417 | if (!process_pending_timers(tq, t, epoll_fd)) | |||
418 | goto infinite_timeout; | |||
419 | ||||
420 | wheel_timeout = timeouts_timeout(t->wheel); | |||
421 | if (wheel_timeout == 0) | |||
422 | goto infinite_timeout; | |||
423 | } | |||
424 | ||||
425 | return (int)wheel_timeout; | |||
426 | ||||
427 | infinite_timeout: | |||
428 | return -1; | |||
429 | } | |||
430 | ||||
431 | static void *thread_io_loop(void *data) | |||
432 | { | |||
433 | struct lwan_thread *t = data; | |||
434 | int epoll_fd = t->epoll_fd; | |||
435 | const int read_pipe_fd = t->pipe_fd[0]; | |||
436 | 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; }); | |||
437 | struct lwan *lwan = t->lwan; | |||
438 | struct epoll_event *events; | |||
439 | struct coro_switcher switcher; | |||
440 | struct timeout_queue tq; | |||
441 | ||||
442 | lwan_status_debug("Worker thread #%zd starting",lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 443, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1) | |||
443 | t - t->lwan->thread.threads + 1)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 443, __FUNCTION__, "Worker thread #%zd starting", t - t-> lwan->thread.threads + 1); | |||
444 | lwan_set_thread_name("worker"); | |||
445 | ||||
446 | events = calloc((size_t)max_events, sizeof(*events)); | |||
447 | if (UNLIKELY(!events)__builtin_expect(((!events)), (0))) | |||
448 | 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" , 448, __FUNCTION__, "Could not allocate memory for events"); | |||
449 | ||||
450 | update_date_cache(t); | |||
451 | ||||
452 | timeout_queue_init(&tq, lwan); | |||
453 | ||||
454 | pthread_barrier_wait(&lwan->thread.barrier); | |||
455 | ||||
456 | for (;;) { | |||
457 | int timeout = turn_timer_wheel(&tq, t, epoll_fd); | |||
458 | int n_fds = epoll_wait(epoll_fd, events, max_events, timeout); | |||
459 | ||||
460 | if (UNLIKELY(n_fds < 0)__builtin_expect(((n_fds < 0)), (0))) { | |||
461 | if (errno(*__errno_location ()) == EBADF9 || errno(*__errno_location ()) == EINVAL22) | |||
462 | break; | |||
463 | continue; | |||
464 | } | |||
465 | ||||
466 | for (struct epoll_event *event = events; n_fds--; event++) { | |||
467 | struct lwan_connection *conn; | |||
468 | ||||
469 | if (UNLIKELY(!event->data.ptr)__builtin_expect(((!event->data.ptr)), (0))) { | |||
470 | accept_nudge(read_pipe_fd, t, lwan->conns, &tq, &switcher, | |||
471 | epoll_fd); | |||
472 | continue; | |||
473 | } | |||
474 | ||||
475 | conn = event->data.ptr; | |||
476 | ||||
477 | if (UNLIKELY(event->events & (EPOLLRDHUP | EPOLLHUP))__builtin_expect(((event->events & (EPOLLRDHUP | EPOLLHUP ))), (0))) { | |||
478 | timeout_queue_expire(&tq, conn); | |||
479 | continue; | |||
480 | } | |||
481 | ||||
482 | resume_coro(&tq, conn, epoll_fd); | |||
483 | timeout_queue_move_to_last(&tq, conn); | |||
484 | } | |||
485 | } | |||
486 | ||||
487 | pthread_barrier_wait(&lwan->thread.barrier); | |||
488 | ||||
489 | timeout_queue_expire_all(&tq); | |||
490 | free(events); | |||
491 | ||||
492 | return NULL((void*)0); | |||
493 | } | |||
494 | ||||
495 | static void create_thread(struct lwan *l, struct lwan_thread *thread, | |||
496 | const size_t n_queue_fds) | |||
497 | { | |||
498 | int ignore; | |||
499 | pthread_attr_t attr; | |||
500 | ||||
501 | memset(thread, 0, sizeof(*thread)); | |||
502 | thread->lwan = l; | |||
503 | ||||
504 | thread->wheel = timeouts_open(&ignore); | |||
505 | if (!thread->wheel) | |||
506 | lwan_status_critical("Could not create timer wheel")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 506, __FUNCTION__, "Could not create timer wheel"); | |||
507 | ||||
508 | if ((thread->epoll_fd = epoll_create1(EPOLL_CLOEXECEPOLL_CLOEXEC)) < 0) | |||
509 | lwan_status_critical_perror("epoll_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 509, __FUNCTION__, "epoll_create"); | |||
510 | ||||
511 | if (pthread_attr_init(&attr)) | |||
512 | lwan_status_critical_perror("pthread_attr_init")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 512, __FUNCTION__, "pthread_attr_init"); | |||
513 | ||||
514 | if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEMPTHREAD_SCOPE_SYSTEM)) | |||
515 | lwan_status_critical_perror("pthread_attr_setscope")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 515, __FUNCTION__, "pthread_attr_setscope"); | |||
516 | ||||
517 | if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLEPTHREAD_CREATE_JOINABLE)) | |||
518 | lwan_status_critical_perror("pthread_attr_setdetachstate")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 518, __FUNCTION__, "pthread_attr_setdetachstate"); | |||
519 | ||||
520 | #if defined(HAVE_EVENTFD) | |||
521 | int efd = eventfd(0, EFD_NONBLOCKEFD_NONBLOCK | EFD_SEMAPHOREEFD_SEMAPHORE | EFD_CLOEXECEFD_CLOEXEC); | |||
522 | if (efd < 0) | |||
523 | lwan_status_critical_perror("eventfd")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 523, __FUNCTION__, "eventfd"); | |||
524 | ||||
525 | thread->pipe_fd[0] = thread->pipe_fd[1] = efd; | |||
526 | #else | |||
527 | if (pipe2(thread->pipe_fd, O_NONBLOCK04000 | O_CLOEXEC02000000) < 0) | |||
528 | lwan_status_critical_perror("pipe")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 528, __FUNCTION__, "pipe"); | |||
529 | #endif | |||
530 | ||||
531 | struct epoll_event event = { .events = EPOLLINEPOLLIN, .data.ptr = NULL((void*)0) }; | |||
532 | if (epoll_ctl(thread->epoll_fd, EPOLL_CTL_ADD1, thread->pipe_fd[0], &event) < 0) | |||
533 | lwan_status_critical_perror("epoll_ctl")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 533, __FUNCTION__, "epoll_ctl"); | |||
534 | ||||
535 | if (pthread_create(&thread->self, &attr, thread_io_loop, thread)) | |||
536 | lwan_status_critical_perror("pthread_create")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 536, __FUNCTION__, "pthread_create"); | |||
537 | ||||
538 | if (pthread_attr_destroy(&attr)) | |||
539 | lwan_status_critical_perror("pthread_attr_destroy")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 539, __FUNCTION__, "pthread_attr_destroy"); | |||
540 | ||||
541 | if (spsc_queue_init(&thread->pending_fds, n_queue_fds) < 0) { | |||
542 | lwan_status_critical("Could not initialize pending fd "lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 543, __FUNCTION__, "Could not initialize pending fd " "queue width %zu elements" , n_queue_fds) | |||
543 | "queue width %zu elements", n_queue_fds)lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 543, __FUNCTION__, "Could not initialize pending fd " "queue width %zu elements" , n_queue_fds); | |||
544 | } | |||
545 | } | |||
546 | ||||
547 | void lwan_thread_nudge(struct lwan_thread *t) | |||
548 | { | |||
549 | uint64_t event = 1; | |||
550 | ||||
551 | if (UNLIKELY(write(t->pipe_fd[1], &event, sizeof(event)) < 0)__builtin_expect(((write(t->pipe_fd[1], &event, sizeof (event)) < 0)), (0))) | |||
552 | lwan_status_perror("write")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 552, __FUNCTION__, "write"); | |||
553 | } | |||
554 | ||||
555 | void lwan_thread_add_client(struct lwan_thread *t, int fd) | |||
556 | { | |||
557 | for (int i = 0; i < 10; i++) { | |||
558 | bool_Bool pushed = spsc_queue_push(&t->pending_fds, fd); | |||
559 | ||||
560 | if (LIKELY(pushed)__builtin_expect((!!(pushed)), (1))) | |||
561 | return; | |||
562 | ||||
563 | /* Queue is full; nudge the thread to consume it. */ | |||
564 | lwan_thread_nudge(t); | |||
565 | } | |||
566 | ||||
567 | lwan_status_error("Dropping connection %d", fd)lwan_status_error_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 567, __FUNCTION__, "Dropping connection %d", fd); | |||
568 | /* FIXME: send "busy" response now, even without receiving request? */ | |||
569 | close(fd); | |||
570 | } | |||
571 | ||||
572 | #if defined(__linux__1) && defined(__x86_64__1) | |||
573 | static bool_Bool read_cpu_topology(struct lwan *l, uint32_t siblings[]) | |||
574 | { | |||
575 | char path[PATH_MAX4096]; | |||
576 | ||||
577 | for (unsigned int i = 0; i < l->n_cpus; i++) { | |||
578 | FILE *sib; | |||
579 | uint32_t id, sibling; | |||
580 | char separator; | |||
581 | ||||
582 | snprintf(path, sizeof(path), | |||
583 | "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list", | |||
584 | i); | |||
585 | ||||
586 | sib = fopen(path, "re"); | |||
587 | if (!sib) { | |||
588 | 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" , 589, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path) | |||
589 | path)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 589, __FUNCTION__, "Could not open `%s` to determine CPU topology" , path); | |||
590 | return false0; | |||
591 | } | |||
592 | ||||
593 | switch (fscanf(sib, "%u%c%u", &id, &separator, &sibling)) { | |||
594 | case 2: /* No SMT */ | |||
595 | siblings[i] = id; | |||
596 | break; | |||
597 | case 3: /* SMT */ | |||
598 | if (!(separator == ',' || separator == '-')) { | |||
599 | 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" , 599, __FUNCTION__, "Expecting either ',' or '-' for sibling separator" ); | |||
600 | __builtin_unreachable(); | |||
601 | } | |||
602 | ||||
603 | siblings[i] = sibling; | |||
604 | break; | |||
605 | default: | |||
606 | lwan_status_critical("%s has invalid format", path)lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 606, __FUNCTION__, "%s has invalid format", path); | |||
607 | __builtin_unreachable(); | |||
608 | } | |||
609 | ||||
610 | ||||
611 | fclose(sib); | |||
612 | } | |||
613 | ||||
614 | return true1; | |||
615 | } | |||
616 | ||||
617 | static void | |||
618 | siblings_to_schedtbl(struct lwan *l, uint32_t siblings[], uint32_t schedtbl[]) | |||
619 | { | |||
620 | int *seen = alloca(l->n_cpus * sizeof(int))__builtin_alloca (l->n_cpus * sizeof(int)); | |||
621 | int n_schedtbl = 0; | |||
622 | ||||
623 | for (uint32_t i = 0; i < l->n_cpus; i++) | |||
624 | seen[i] = -1; | |||
625 | ||||
626 | for (uint32_t i = 0; i < l->n_cpus; i++) { | |||
627 | if (seen[siblings[i]] < 0) { | |||
628 | seen[siblings[i]] = (int)i; | |||
629 | } else { | |||
630 | schedtbl[n_schedtbl++] = (uint32_t)seen[siblings[i]]; | |||
631 | schedtbl[n_schedtbl++] = i; | |||
632 | } | |||
633 | } | |||
634 | ||||
635 | if (!
| |||
636 | memcpy(schedtbl, seen, l->n_cpus * sizeof(int)); | |||
637 | } | |||
638 | ||||
639 | static void | |||
640 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) | |||
641 | { | |||
642 | uint32_t *siblings = alloca(l->n_cpus * sizeof(uint32_t))__builtin_alloca (l->n_cpus * sizeof(uint32_t)); | |||
643 | ||||
644 | if (!read_cpu_topology(l, siblings)) { | |||
645 | for (uint32_t i = 0; i < n_threads; i++) | |||
646 | schedtbl[i] = (i / 2) % l->thread.count; | |||
647 | } else { | |||
648 | uint32_t *affinity = alloca(l->n_cpus * sizeof(uint32_t))__builtin_alloca (l->n_cpus * sizeof(uint32_t)); | |||
649 | ||||
650 | siblings_to_schedtbl(l, siblings, affinity); | |||
651 | ||||
652 | for (uint32_t i = 0; i < n_threads; i++) | |||
653 | schedtbl[i] = affinity[i % l->n_cpus]; | |||
| ||||
654 | } | |||
655 | } | |||
656 | ||||
657 | static void | |||
658 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t mask) | |||
659 | { | |||
660 | for (uint32_t i = 0; i < l->thread.count; i++) { | |||
661 | cpu_set_t set; | |||
662 | ||||
663 | CPU_ZERO(&set)do __builtin_memset (&set, '\0', sizeof (cpu_set_t)); while (0); | |||
664 | 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; })); | |||
665 | ||||
666 | if (pthread_setaffinity_np(l->thread.threads[i].self, sizeof(set), | |||
667 | &set)) | |||
668 | 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" , 668, __FUNCTION__, "Could not set affinity for thread %d", i ); | |||
669 | } | |||
670 | } | |||
671 | #elif defined(__x86_64__1) | |||
672 | static void | |||
673 | topology_to_schedtbl(struct lwan *l, uint32_t schedtbl[], uint32_t n_threads) | |||
674 | { | |||
675 | for (uint32_t i = 0; i < n_threads; i++) | |||
676 | schedtbl[i] = (i / 2) % l->thread.count; | |||
677 | } | |||
678 | ||||
679 | static void | |||
680 | adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t n) | |||
681 | { | |||
682 | } | |||
683 | #endif | |||
684 | ||||
685 | void lwan_thread_init(struct lwan *l) | |||
686 | { | |||
687 | if (pthread_barrier_init(&l->thread.barrier, NULL((void*)0), | |||
| ||||
688 | (unsigned)l->thread.count + 1)) | |||
689 | lwan_status_critical("Could not create barrier")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 689, __FUNCTION__, "Could not create barrier"); | |||
690 | ||||
691 | lwan_status_debug("Initializing threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 691, __FUNCTION__, "Initializing threads"); | |||
692 | ||||
693 | l->thread.threads = | |||
694 | calloc((size_t)l->thread.count, sizeof(struct lwan_thread)); | |||
695 | if (!l->thread.threads) | |||
696 | 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" , 696, __FUNCTION__, "Could not allocate memory for threads"); | |||
697 | ||||
698 | const size_t n_queue_fds = LWAN_MIN(l->thread.max_fd / l->thread.count,({ const __typeof__((l->thread.max_fd / l->thread.count ) + 0) lwan_tmp_id6 = (l->thread.max_fd / l->thread.count ); const __typeof__(((size_t)(2 * lwan_socket_get_backlog_size ())) + 0) lwan_tmp_id7 = ((size_t)(2 * lwan_socket_get_backlog_size ())); lwan_tmp_id6 > lwan_tmp_id7 ? lwan_tmp_id7 : lwan_tmp_id6 ; }) | |||
699 | (size_t)(2 * lwan_socket_get_backlog_size()))({ const __typeof__((l->thread.max_fd / l->thread.count ) + 0) lwan_tmp_id6 = (l->thread.max_fd / l->thread.count ); const __typeof__(((size_t)(2 * lwan_socket_get_backlog_size ())) + 0) lwan_tmp_id7 = ((size_t)(2 * lwan_socket_get_backlog_size ())); lwan_tmp_id6 > lwan_tmp_id7 ? lwan_tmp_id7 : lwan_tmp_id6 ; }); | |||
700 | lwan_status_debug("Pending client file descriptor queue has %zu items", n_queue_fds)lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 700, __FUNCTION__, "Pending client file descriptor queue has %zu items" , n_queue_fds); | |||
701 | for (unsigned int i = 0; i < l->thread.
| |||
702 | create_thread(l, &l->thread.threads[i], n_queue_fds); | |||
703 | ||||
704 | const unsigned int total_conns = l->thread.max_fd * l->thread.count; | |||
705 | #ifdef __x86_64__1 | |||
706 | 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; })] | |||
707 | "Two connections per cache line")extern int (*__Static_assert_function (void)) [!!sizeof (struct { int __error_if_negative: (sizeof(struct lwan_connection) == 32) ? 2 : -1; })]; | |||
708 | /* | |||
709 | * Pre-schedule each file descriptor, to reduce some operations in the | |||
710 | * fast path. | |||
711 | * | |||
712 | * Since struct lwan_connection is guaranteed to be 32-byte long, two of | |||
713 | * them can fill up a cache line. Assume siblings share cache lines and | |||
714 | * use the CPU topology to group two connections per cache line in such | |||
715 | * a way that false sharing is avoided. | |||
716 | */ | |||
717 | uint32_t n_threads = (uint32_t)lwan_nextpow2((size_t)((l->thread.count - 1) * 2)); | |||
718 | uint32_t *schedtbl = alloca(n_threads * sizeof(uint32_t))__builtin_alloca (n_threads * sizeof(uint32_t)); | |||
719 | ||||
720 | topology_to_schedtbl(l, schedtbl, n_threads); | |||
721 | ||||
722 | n_threads--; /* Transform count into mask for AND below */ | |||
723 | adjust_threads_affinity(l, schedtbl, n_threads); | |||
724 | for (unsigned int i = 0; i < total_conns; i++) | |||
725 | l->conns[i].thread = &l->thread.threads[schedtbl[i & n_threads]]; | |||
726 | #else | |||
727 | for (unsigned int i = 0; i < total_conns; i++) | |||
728 | l->conns[i].thread = &l->thread.threads[i % l->thread.count]; | |||
729 | #endif | |||
730 | ||||
731 | pthread_barrier_wait(&l->thread.barrier); | |||
732 | ||||
733 | 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" , 733, __FUNCTION__, "Worker threads created and ready to serve" ); | |||
734 | } | |||
735 | ||||
736 | void lwan_thread_shutdown(struct lwan *l) | |||
737 | { | |||
738 | lwan_status_debug("Shutting down threads")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c" , 738, __FUNCTION__, "Shutting down threads"); | |||
739 | ||||
740 | for (unsigned int i = 0; i < l->thread.count; i++) { | |||
741 | struct lwan_thread *t = &l->thread.threads[i]; | |||
742 | ||||
743 | close(t->epoll_fd); | |||
744 | lwan_thread_nudge(t); | |||
745 | } | |||
746 | ||||
747 | pthread_barrier_wait(&l->thread.barrier); | |||
748 | pthread_barrier_destroy(&l->thread.barrier); | |||
749 | ||||
750 | for (unsigned int i = 0; i < l->thread.count; i++) { | |||
751 | struct lwan_thread *t = &l->thread.threads[i]; | |||
752 | ||||
753 | close(t->pipe_fd[0]); | |||
754 | #if !defined(HAVE_EVENTFD) | |||
755 | close(t->pipe_fd[1]); | |||
756 | #endif | |||
757 | ||||
758 | pthread_join(l->thread.threads[i].self, NULL((void*)0)); | |||
759 | spsc_queue_free(&t->pending_fds); | |||
760 | timeouts_close(t->wheel); | |||
761 | } | |||
762 | ||||
763 | free(l->thread.threads); | |||
764 | } |