Bug Summary

File:lwan-thread.c
Warning:line 558, column 13
Value stored to 'accepted_connections' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name lwan-thread.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -fno-plt -munwind-tables -target-cpu x86-64 -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib/clang/11.1.0 -include /home/buildbot/lwan-worker/clang-analyze/build/lwan-build-config.h -D _FILE_OFFSET_BITS=64 -D _TIME_BITS=64 -I /home/buildbot/lwan-worker/clang-analyze/build/src/lib/missing -I /usr/include/luajit-2.0 -I /usr/include/valgrind -I /home/buildbot/lwan-worker/clang-analyze/build/src/lib -I /home/buildbot/lwan-worker/clang-analyze/build -internal-isystem /usr/local/include -internal-isystem /usr/lib/clang/11.1.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-unused-parameter -Wno-free-nonheap-object -std=gnu99 -fdebug-compilation-dir /home/buildbot/lwan-worker/clang-analyze/build/src/lib -ferror-limit 19 -stack-protector 2 -fgnuc-version=4.2.1 -analyzer-output=html -faddrsig -o /home/buildbot/lwan-worker/clang-analyze/CLANG/2021-05-11-151941-4182083-1 -x c /home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan-thread.c
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
38static void lwan_strbuf_free_defer(void *data)
39{
40 lwan_strbuf_free((struct lwan_strbuf *)data);
41}
42
43static 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
165static ALWAYS_INLINEinline __attribute__((always_inline)) uint32_t
166conn_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
178static 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
232static 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
239static enum lwan_connection_coro_yield
240resume_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
284static 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
303static 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
312static 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
347static 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
386static int
387turn_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
416static 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 (SO_INCOMING_CPU_SUPPORTED1) {
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 }
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
469static 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 (SO_INCOMING_CPU_SUPPORTED1) {
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 }
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
492static 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_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; })
;
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;
Value stored to 'accepted_connections' is never read
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
570static 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)
601static 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
668static void
669siblings_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
690static bool_Bool
691topology_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
710static void
711adjust_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)
725static bool_Bool
726topology_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
733static void
734adjust_threads_affinity(struct lwan *l, uint32_t *schedtbl, uint32_t n)
735{
736}
737#endif
738
739void 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
816void 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}