Index/include / boost / corosio / native / detail / epoll / epoll_socket_service.hpp

include/boost/corosio/native/detail/epoll/epoll_socket_service.hpp

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1 //
2 // Copyright (c) 2026 Steve Gerbino
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // Official repository: https://github.com/cppalliance/corosio
8 //
9
10 #ifndef BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_SERVICE_HPP
11 #define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_SERVICE_HPP
12
13 #include <boost/corosio/detail/platform.hpp>
14
15 #if BOOST_COROSIO_HAS_EPOLL
16
17 #include <boost/corosio/detail/config.hpp>
18 #include <boost/capy/ex/execution_context.hpp>
19 #include <boost/corosio/detail/socket_service.hpp>
20
21 #include <boost/corosio/native/detail/epoll/epoll_socket.hpp>
22 #include <boost/corosio/native/detail/epoll/epoll_scheduler.hpp>
23
24 #include <boost/corosio/native/detail/endpoint_convert.hpp>
25 #include <boost/corosio/native/detail/make_err.hpp>
26 #include <boost/corosio/detail/dispatch_coro.hpp>
27 #include <boost/corosio/detail/except.hpp>
28 #include <boost/capy/buffers.hpp>
29
30 #include <coroutine>
31 #include <mutex>
32 #include <unordered_map>
33 #include <utility>
34
35 #include <errno.h>
36 #include <netinet/in.h>
37 #include <netinet/tcp.h>
38 #include <sys/epoll.h>
39 #include <sys/socket.h>
40 #include <unistd.h>
41
42 /*
43 epoll Socket Implementation
44 ===========================
45
46 Each I/O operation follows the same pattern:
47 1. Try the syscall immediately (non-blocking socket)
48 2. If it succeeds or fails with a real error, post to completion queue
49 3. If EAGAIN/EWOULDBLOCK, register with epoll and wait
50
51 This "try first" approach avoids unnecessary epoll round-trips for
52 operations that can complete immediately (common for small reads/writes
53 on fast local connections).
54
55 One-Shot Registration
56 ---------------------
57 We use one-shot epoll registration: each operation registers, waits for
58 one event, then unregisters. This simplifies the state machine since we
59 don't need to track whether an fd is currently registered or handle
60 re-arming. The tradeoff is slightly more epoll_ctl calls, but the
61 simplicity is worth it.
62
63 Cancellation
64 ------------
65 See op.hpp for the completion/cancellation race handling via the
66 `registered` atomic. cancel() must complete pending operations (post
67 them with cancelled flag) so coroutines waiting on them can resume.
68 close_socket() calls cancel() first to ensure this.
69
70 Impl Lifetime with shared_ptr
71 -----------------------------
72 Socket impls use enable_shared_from_this. The service owns impls via
73 shared_ptr maps (socket_ptrs_) keyed by raw pointer for O(1) lookup and
74 removal. When a user calls close(), we call cancel() which posts pending
75 ops to the scheduler.
76
77 CRITICAL: The posted ops must keep the impl alive until they complete.
78 Otherwise the scheduler would process a freed op (use-after-free). The
79 cancel() method captures shared_from_this() into op.impl_ptr before
80 posting. When the op completes, impl_ptr is cleared, allowing the impl
81 to be destroyed if no other references exist.
82
83 Service Ownership
84 -----------------
85 epoll_socket_service owns all socket impls. destroy_impl() removes the
86 shared_ptr from the map, but the impl may survive if ops still hold
87 impl_ptr refs. shutdown() closes all sockets and clears the map; any
88 in-flight ops will complete and release their refs.
89 */
90
91 namespace boost::corosio::detail {
92
93 /** State for epoll socket service. */
94 class epoll_socket_state
95 {
96 public:
97 244x explicit epoll_socket_state(epoll_scheduler& sched) noexcept : sched_(sched)
98 {
99 244x }
100
101 epoll_scheduler& sched_;
102 std::mutex mutex_;
103 intrusive_list<epoll_socket> socket_list_;
104 std::unordered_map<epoll_socket*, std::shared_ptr<epoll_socket>>
105 socket_ptrs_;
106 };
107
108 /** epoll socket service implementation.
109
110 Inherits from socket_service to enable runtime polymorphism.
111 Uses key_type = socket_service for service lookup.
112 */
113 class BOOST_COROSIO_DECL epoll_socket_service final : public socket_service
114 {
115 public:
116 explicit epoll_socket_service(capy::execution_context& ctx);
117 ~epoll_socket_service() override;
118
119 epoll_socket_service(epoll_socket_service const&) = delete;
120 epoll_socket_service& operator=(epoll_socket_service const&) = delete;
121
122 void shutdown() override;
123
124 io_object::implementation* construct() override;
125 void destroy(io_object::implementation*) override;
126 void close(io_object::handle&) override;
127 std::error_code open_socket(
128 tcp_socket::implementation& impl,
129 int family,
130 int type,
131 int protocol) override;
132
133 415684x epoll_scheduler& scheduler() const noexcept
134 {
135 415684x return state_->sched_;
136 }
137 void post(epoll_op* op);
138 void work_started() noexcept;
139 void work_finished() noexcept;
140
141 private:
142 std::unique_ptr<epoll_socket_state> state_;
143 };
144
145 //--------------------------------------------------------------------------
146 //
147 // Implementation
148 //
149 //--------------------------------------------------------------------------
150
151 // Register an op with the reactor, handling cached edge events.
152 // Called under the EAGAIN/EINPROGRESS path when speculative I/O failed.
153 inline void
154 3195x epoll_socket::register_op(
155 epoll_op& op,
156 epoll_op*& desc_slot,
157 bool& ready_flag,
158 bool& cancel_flag) noexcept
159 {
160 3195x svc_.work_started();
161
162 3195x std::lock_guard lock(desc_state_.mutex);
163 3195x bool io_done = false;
164 3195x if (ready_flag)
165 {
166 141x ready_flag = false;
167 141x op.perform_io();
168 141x io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
169 141x if (!io_done)
170 141x op.errn = 0;
171 }
172
173 3195x if (cancel_flag)
174 {
175 94x cancel_flag = false;
176 94x op.cancelled.store(true, std::memory_order_relaxed);
177 }
178
179 3195x if (io_done || op.cancelled.load(std::memory_order_acquire))
180 {
181 94x svc_.post(&op);
182 94x svc_.work_finished();
183 }
184 else
185 {
186 3101x desc_slot = &op;
187 }
188 3195x }
189
190 inline void
191 104x epoll_op::canceller::operator()() const noexcept
192 {
193 104x op->cancel();
194 104x }
195
196 inline void
197 ✗ epoll_connect_op::cancel() noexcept
198 {
199 ✗ if (socket_impl_)
200 ✗ socket_impl_->cancel_single_op(*this);
201 else
202 ✗ request_cancel();
203 ✗ }
204
205 inline void
206 98x epoll_read_op::cancel() noexcept
207 {
208 98x if (socket_impl_)
209 98x socket_impl_->cancel_single_op(*this);
210 else
211 ✗ request_cancel();
212 98x }
213
214 inline void
215 ✗ epoll_write_op::cancel() noexcept
216 {
217 ✗ if (socket_impl_)
218 ✗ socket_impl_->cancel_single_op(*this);
219 else
220 ✗ request_cancel();
221 ✗ }
222
223 inline void
224 66888x epoll_op::operator()()
225 {
226 66888x stop_cb.reset();
227
228 66888x socket_impl_->svc_.scheduler().reset_inline_budget();
229
230 66888x if (cancelled.load(std::memory_order_acquire))
231 204x *ec_out = capy::error::canceled;
232 66684x else if (errn != 0)
233 ✗ *ec_out = make_err(errn);
234 66684x else if (is_read_operation() && bytes_transferred == 0)
235 ✗ *ec_out = capy::error::eof;
236 else
237 66684x *ec_out = {};
238
239 66888x *bytes_out = bytes_transferred;
240
241 // Move to stack before resuming coroutine. The coroutine might close
242 // the socket, releasing the last wrapper ref. If impl_ptr were the
243 // last ref and we destroyed it while still in operator(), we'd have
244 // use-after-free. Moving to local ensures destruction happens at
245 // function exit, after all member accesses are complete.
246 66888x capy::executor_ref saved_ex(ex);
247 66888x std::coroutine_handle<> saved_h(h);
248 66888x auto prevent_premature_destruction = std::move(impl_ptr);
249 66888x dispatch_coro(saved_ex, saved_h).resume();
250 66888x }
251
252 inline void
253 2995x epoll_connect_op::operator()()
254 {
255 2995x stop_cb.reset();
256
257 2995x socket_impl_->svc_.scheduler().reset_inline_budget();
258
259 2995x bool success = (errn == 0 && !cancelled.load(std::memory_order_acquire));
260
261 // Cache endpoints on successful connect
262 2995x if (success && socket_impl_)
263 {
264 2993x endpoint local_ep;
265 2993x sockaddr_storage local_storage{};
266 2993x socklen_t local_len = sizeof(local_storage);
267 2993x if (::getsockname(
268 2993x fd, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
269 0)
270 2993x local_ep = from_sockaddr(local_storage);
271 2993x static_cast<epoll_socket*>(socket_impl_)
272 2993x ->set_endpoints(local_ep, target_endpoint);
273 }
274
275 2995x if (cancelled.load(std::memory_order_acquire))
276 ✗ *ec_out = capy::error::canceled;
277 2995x else if (errn != 0)
278 2x *ec_out = make_err(errn);
279 else
280 2993x *ec_out = {};
281
282 // Move to stack before resuming. See epoll_op::operator()() for rationale.
283 2995x capy::executor_ref saved_ex(ex);
284 2995x std::coroutine_handle<> saved_h(h);
285 2995x auto prevent_premature_destruction = std::move(impl_ptr);
286 2995x dispatch_coro(saved_ex, saved_h).resume();
287 2995x }
288
289 9042x inline epoll_socket::epoll_socket(epoll_socket_service& svc) noexcept
290 9042x : svc_(svc)
291 {
292 9042x }
293
294 9042x inline epoll_socket::~epoll_socket() = default;
295
296 inline std::coroutine_handle<>
297 2995x epoll_socket::connect(
298 std::coroutine_handle<> h,
299 capy::executor_ref ex,
300 endpoint ep,
301 std::stop_token token,
302 std::error_code* ec)
303 {
304 2995x auto& op = conn_;
305
306 2995x sockaddr_storage storage{};
307 socklen_t addrlen =
308 2995x detail::to_sockaddr(ep, detail::socket_family(fd_), storage);
309 2995x int result = ::connect(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen);
310
311 2995x if (result == 0)
312 {
313 ✗ sockaddr_storage local_storage{};
314 ✗ socklen_t local_len = sizeof(local_storage);
315 ✗ if (::getsockname(
316 ✗ fd_, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
317 0)
318 ✗ local_endpoint_ = detail::from_sockaddr(local_storage);
319 ✗ remote_endpoint_ = ep;
320 }
321
322 2995x if (result == 0 || errno != EINPROGRESS)
323 {
324 ✗ int err = (result < 0) ? errno : 0;
325 ✗ if (svc_.scheduler().try_consume_inline_budget())
326 {
327 ✗ *ec = err ? make_err(err) : std::error_code{};
328 ✗ return dispatch_coro(ex, h);
329 }
330 ✗ op.reset();
331 ✗ op.h = h;
332 ✗ op.ex = ex;
333 ✗ op.ec_out = ec;
334 ✗ op.fd = fd_;
335 ✗ op.target_endpoint = ep;
336 ✗ op.start(token, this);
337 ✗ op.impl_ptr = shared_from_this();
338 ✗ op.complete(err, 0);
339 ✗ svc_.post(&op);
340 ✗ return std::noop_coroutine();
341 }
342
343 // EINPROGRESS — register with reactor
344 2995x op.reset();
345 2995x op.h = h;
346 2995x op.ex = ex;
347 2995x op.ec_out = ec;
348 2995x op.fd = fd_;
349 2995x op.target_endpoint = ep;
350 2995x op.start(token, this);
351 2995x op.impl_ptr = shared_from_this();
352
353 2995x register_op(
354 2995x op, desc_state_.connect_op, desc_state_.write_ready,
355 2995x desc_state_.connect_cancel_pending);
356 2995x return std::noop_coroutine();
357 }
358
359 inline std::coroutine_handle<>
360 167098x epoll_socket::read_some(
361 std::coroutine_handle<> h,
362 capy::executor_ref ex,
363 buffer_param param,
364 std::stop_token token,
365 std::error_code* ec,
366 std::size_t* bytes_out)
367 {
368 167098x auto& op = rd_;
369 167098x op.reset();
370
371 167098x capy::mutable_buffer bufs[epoll_read_op::max_buffers];
372 167098x op.iovec_count =
373 167098x static_cast<int>(param.copy_to(bufs, epoll_read_op::max_buffers));
374
375 167098x if (op.iovec_count == 0 || (op.iovec_count == 1 && bufs[0].size() == 0))
376 {
377 1x op.empty_buffer_read = true;
378 1x op.h = h;
379 1x op.ex = ex;
380 1x op.ec_out = ec;
381 1x op.bytes_out = bytes_out;
382 1x op.start(token, this);
383 1x op.impl_ptr = shared_from_this();
384 1x op.complete(0, 0);
385 1x svc_.post(&op);
386 1x return std::noop_coroutine();
387 }
388
389 334194x for (int i = 0; i < op.iovec_count; ++i)
390 {
391 167097x op.iovecs[i].iov_base = bufs[i].data();
392 167097x op.iovecs[i].iov_len = bufs[i].size();
393 }
394
395 // Speculative read
396 ssize_t n;
397 do
398 {
399 167097x n = ::readv(fd_, op.iovecs, op.iovec_count);
400 }
401 167097x while (n < 0 && errno == EINTR);
402
403 167097x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
404 {
405 166897x int err = (n < 0) ? errno : 0;
406 166897x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
407
408 166897x if (svc_.scheduler().try_consume_inline_budget())
409 {
410 133563x if (err)
411 ✗ *ec = make_err(err);
412 133563x else if (n == 0)
413 5x *ec = capy::error::eof;
414 else
415 133558x *ec = {};
416 133563x *bytes_out = bytes;
417 133563x return dispatch_coro(ex, h);
418 }
419 33334x op.h = h;
420 33334x op.ex = ex;
421 33334x op.ec_out = ec;
422 33334x op.bytes_out = bytes_out;
423 33334x op.start(token, this);
424 33334x op.impl_ptr = shared_from_this();
425 33334x op.complete(err, bytes);
426 33334x svc_.post(&op);
427 33334x return std::noop_coroutine();
428 }
429
430 // EAGAIN — register with reactor
431 200x op.h = h;
432 200x op.ex = ex;
433 200x op.ec_out = ec;
434 200x op.bytes_out = bytes_out;
435 200x op.fd = fd_;
436 200x op.start(token, this);
437 200x op.impl_ptr = shared_from_this();
438
439 200x register_op(
440 200x op, desc_state_.read_op, desc_state_.read_ready,
441 200x desc_state_.read_cancel_pending);
442 200x return std::noop_coroutine();
443 }
444
445 inline std::coroutine_handle<>
446 166899x epoll_socket::write_some(
447 std::coroutine_handle<> h,
448 capy::executor_ref ex,
449 buffer_param param,
450 std::stop_token token,
451 std::error_code* ec,
452 std::size_t* bytes_out)
453 {
454 166899x auto& op = wr_;
455 166899x op.reset();
456
457 166899x capy::mutable_buffer bufs[epoll_write_op::max_buffers];
458 166899x op.iovec_count =
459 166899x static_cast<int>(param.copy_to(bufs, epoll_write_op::max_buffers));
460
461 166899x if (op.iovec_count == 0 || (op.iovec_count == 1 && bufs[0].size() == 0))
462 {
463 1x op.h = h;
464 1x op.ex = ex;
465 1x op.ec_out = ec;
466 1x op.bytes_out = bytes_out;
467 1x op.start(token, this);
468 1x op.impl_ptr = shared_from_this();
469 1x op.complete(0, 0);
470 1x svc_.post(&op);
471 1x return std::noop_coroutine();
472 }
473
474 333796x for (int i = 0; i < op.iovec_count; ++i)
475 {
476 166898x op.iovecs[i].iov_base = bufs[i].data();
477 166898x op.iovecs[i].iov_len = bufs[i].size();
478 }
479
480 // Speculative write
481 166898x msghdr msg{};
482 166898x msg.msg_iov = op.iovecs;
483 166898x msg.msg_iovlen = static_cast<std::size_t>(op.iovec_count);
484
485 ssize_t n;
486 do
487 {
488 166898x n = ::sendmsg(fd_, &msg, MSG_NOSIGNAL);
489 }
490 166898x while (n < 0 && errno == EINTR);
491
492 166898x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
493 {
494 166898x int err = (n < 0) ? errno : 0;
495 166898x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
496
497 166898x if (svc_.scheduler().try_consume_inline_budget())
498 {
499 133546x *ec = err ? make_err(err) : std::error_code{};
500 133546x *bytes_out = bytes;
501 133546x return dispatch_coro(ex, h);
502 }
503 33352x op.h = h;
504 33352x op.ex = ex;
505 33352x op.ec_out = ec;
506 33352x op.bytes_out = bytes_out;
507 33352x op.start(token, this);
508 33352x op.impl_ptr = shared_from_this();
509 33352x op.complete(err, bytes);
510 33352x svc_.post(&op);
511 33352x return std::noop_coroutine();
512 }
513
514 // EAGAIN — register with reactor
515 ✗ op.h = h;
516 ✗ op.ex = ex;
517 ✗ op.ec_out = ec;
518 ✗ op.bytes_out = bytes_out;
519 ✗ op.fd = fd_;
520 ✗ op.start(token, this);
521 ✗ op.impl_ptr = shared_from_this();
522
523 ✗ register_op(
524 ✗ op, desc_state_.write_op, desc_state_.write_ready,
525 ✗ desc_state_.write_cancel_pending);
526 ✗ return std::noop_coroutine();
527 }
528
529 inline std::error_code
530 3x epoll_socket::shutdown(tcp_socket::shutdown_type what) noexcept
531 {
532 int how;
533 3x switch (what)
534 {
535 1x case tcp_socket::shutdown_receive:
536 1x how = SHUT_RD;
537 1x break;
538 1x case tcp_socket::shutdown_send:
539 1x how = SHUT_WR;
540 1x break;
541 1x case tcp_socket::shutdown_both:
542 1x how = SHUT_RDWR;
543 1x break;
544 ✗ default:
545 ✗ return make_err(EINVAL);
546 }
547 3x if (::shutdown(fd_, how) != 0)
548 ✗ return make_err(errno);
549 3x return {};
550 }
551
552 inline std::error_code
553 32x epoll_socket::set_option(
554 int level, int optname, void const* data, std::size_t size) noexcept
555 {
556 32x if (::setsockopt(fd_, level, optname, data, static_cast<socklen_t>(size)) !=
557 0)
558 ✗ return make_err(errno);
559 32x return {};
560 }
561
562 inline std::error_code
563 31x epoll_socket::get_option(
564 int level, int optname, void* data, std::size_t* size) const noexcept
565 {
566 31x socklen_t len = static_cast<socklen_t>(*size);
567 31x if (::getsockopt(fd_, level, optname, data, &len) != 0)
568 ✗ return make_err(errno);
569 31x *size = static_cast<std::size_t>(len);
570 31x return {};
571 }
572
573 inline void
574 185x epoll_socket::cancel() noexcept
575 {
576 185x auto self = weak_from_this().lock();
577 185x if (!self)
578 ✗ return;
579
580 185x conn_.request_cancel();
581 185x rd_.request_cancel();
582 185x wr_.request_cancel();
583
584 185x epoll_op* conn_claimed = nullptr;
585 185x epoll_op* rd_claimed = nullptr;
586 185x epoll_op* wr_claimed = nullptr;
587 {
588 185x std::lock_guard lock(desc_state_.mutex);
589 185x if (desc_state_.connect_op == &conn_)
590 ✗ conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
591 else
592 185x desc_state_.connect_cancel_pending = true;
593 185x if (desc_state_.read_op == &rd_)
594 3x rd_claimed = std::exchange(desc_state_.read_op, nullptr);
595 else
596 182x desc_state_.read_cancel_pending = true;
597 185x if (desc_state_.write_op == &wr_)
598 ✗ wr_claimed = std::exchange(desc_state_.write_op, nullptr);
599 else
600 185x desc_state_.write_cancel_pending = true;
601 185x }
602
603 185x if (conn_claimed)
604 {
605 ✗ conn_.impl_ptr = self;
606 ✗ svc_.post(&conn_);
607 ✗ svc_.work_finished();
608 }
609 185x if (rd_claimed)
610 {
611 3x rd_.impl_ptr = self;
612 3x svc_.post(&rd_);
613 3x svc_.work_finished();
614 }
615 185x if (wr_claimed)
616 {
617 ✗ wr_.impl_ptr = self;
618 ✗ svc_.post(&wr_);
619 ✗ svc_.work_finished();
620 }
621 185x }
622
623 inline void
624 98x epoll_socket::cancel_single_op(epoll_op& op) noexcept
625 {
626 98x auto self = weak_from_this().lock();
627 98x if (!self)
628 ✗ return;
629
630 98x op.request_cancel();
631
632 98x epoll_op** desc_op_ptr = nullptr;
633 98x if (&op == &conn_)
634 ✗ desc_op_ptr = &desc_state_.connect_op;
635 98x else if (&op == &rd_)
636 98x desc_op_ptr = &desc_state_.read_op;
637 ✗ else if (&op == &wr_)
638 ✗ desc_op_ptr = &desc_state_.write_op;
639
640 98x if (desc_op_ptr)
641 {
642 98x epoll_op* claimed = nullptr;
643 {
644 98x std::lock_guard lock(desc_state_.mutex);
645 98x if (*desc_op_ptr == &op)
646 98x claimed = std::exchange(*desc_op_ptr, nullptr);
647 ✗ else if (&op == &conn_)
648 ✗ desc_state_.connect_cancel_pending = true;
649 ✗ else if (&op == &rd_)
650 ✗ desc_state_.read_cancel_pending = true;
651 ✗ else if (&op == &wr_)
652 ✗ desc_state_.write_cancel_pending = true;
653 98x }
654 98x if (claimed)
655 {
656 98x op.impl_ptr = self;
657 98x svc_.post(&op);
658 98x svc_.work_finished();
659 }
660 }
661 98x }
662
663 inline void
664 27097x epoll_socket::close_socket() noexcept
665 {
666 27097x auto self = weak_from_this().lock();
667 27097x if (self)
668 {
669 27097x conn_.request_cancel();
670 27097x rd_.request_cancel();
671 27097x wr_.request_cancel();
672
673 27097x epoll_op* conn_claimed = nullptr;
674 27097x epoll_op* rd_claimed = nullptr;
675 27097x epoll_op* wr_claimed = nullptr;
676 {
677 27097x std::lock_guard lock(desc_state_.mutex);
678 27097x conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
679 27097x rd_claimed = std::exchange(desc_state_.read_op, nullptr);
680 27097x wr_claimed = std::exchange(desc_state_.write_op, nullptr);
681 27097x desc_state_.read_ready = false;
682 27097x desc_state_.write_ready = false;
683 27097x desc_state_.read_cancel_pending = false;
684 27097x desc_state_.write_cancel_pending = false;
685 27097x desc_state_.connect_cancel_pending = false;
686 27097x }
687
688 27097x if (conn_claimed)
689 {
690 ✗ conn_.impl_ptr = self;
691 ✗ svc_.post(&conn_);
692 ✗ svc_.work_finished();
693 }
694 27097x if (rd_claimed)
695 {
696 1x rd_.impl_ptr = self;
697 1x svc_.post(&rd_);
698 1x svc_.work_finished();
699 }
700 27097x if (wr_claimed)
701 {
702 ✗ wr_.impl_ptr = self;
703 ✗ svc_.post(&wr_);
704 ✗ svc_.work_finished();
705 }
706
707 27097x if (desc_state_.is_enqueued_.load(std::memory_order_acquire))
708 97x desc_state_.impl_ref_ = self;
709 }
710
711 27097x if (fd_ >= 0)
712 {
713 6003x if (desc_state_.registered_events != 0)
714 6003x svc_.scheduler().deregister_descriptor(fd_);
715 6003x ::close(fd_);
716 6003x fd_ = -1;
717 }
718
719 27097x desc_state_.fd = -1;
720 27097x desc_state_.registered_events = 0;
721
722 27097x local_endpoint_ = endpoint{};
723 27097x remote_endpoint_ = endpoint{};
724 27097x }
725
726 244x inline epoll_socket_service::epoll_socket_service(capy::execution_context& ctx)
727 244x : state_(
728 std::make_unique<epoll_socket_state>(
729 244x ctx.use_service<epoll_scheduler>()))
730 {
731 244x }
732
733 488x inline epoll_socket_service::~epoll_socket_service() {}
734
735 inline void
736 244x epoll_socket_service::shutdown()
737 {
738 244x std::lock_guard lock(state_->mutex_);
739
740 244x while (auto* impl = state_->socket_list_.pop_front())
741 ✗ impl->close_socket();
742
743 // Don't clear socket_ptrs_ here. The scheduler shuts down after us and
744 // drains completed_ops_, calling destroy() on each queued op. If we
745 // released our shared_ptrs now, an epoll_op::destroy() could free the
746 // last ref to an impl whose embedded descriptor_state is still linked
747 // in the queue — use-after-free on the next pop(). Letting ~state_
748 // release the ptrs (during service destruction, after scheduler
749 // shutdown) keeps every impl alive until all ops have been drained.
750 244x }
751
752 inline io_object::implementation*
753 9042x epoll_socket_service::construct()
754 {
755 9042x auto impl = std::make_shared<epoll_socket>(*this);
756 9042x auto* raw = impl.get();
757
758 {
759 9042x std::lock_guard lock(state_->mutex_);
760 9042x state_->socket_list_.push_back(raw);
761 9042x state_->socket_ptrs_.emplace(raw, std::move(impl));
762 9042x }
763
764 9042x return raw;
765 9042x }
766
767 inline void
768 9042x epoll_socket_service::destroy(io_object::implementation* impl)
769 {
770 9042x auto* epoll_impl = static_cast<epoll_socket*>(impl);
771 9042x epoll_impl->close_socket();
772 9042x std::lock_guard lock(state_->mutex_);
773 9042x state_->socket_list_.remove(epoll_impl);
774 9042x state_->socket_ptrs_.erase(epoll_impl);
775 9042x }
776
777 inline std::error_code
778 3010x epoll_socket_service::open_socket(
779 tcp_socket::implementation& impl, int family, int type, int protocol)
780 {
781 3010x auto* epoll_impl = static_cast<epoll_socket*>(&impl);
782 3010x epoll_impl->close_socket();
783
784 3010x int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
785 3010x if (fd < 0)
786 ✗ return make_err(errno);
787
788 3010x if (family == AF_INET6)
789 {
790 5x int one = 1;
791 5x ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
792 }
793
794 3010x epoll_impl->fd_ = fd;
795
796 // Register fd with epoll (edge-triggered mode)
797 3010x epoll_impl->desc_state_.fd = fd;
798 {
799 3010x std::lock_guard lock(epoll_impl->desc_state_.mutex);
800 3010x epoll_impl->desc_state_.read_op = nullptr;
801 3010x epoll_impl->desc_state_.write_op = nullptr;
802 3010x epoll_impl->desc_state_.connect_op = nullptr;
803 3010x }
804 3010x scheduler().register_descriptor(fd, &epoll_impl->desc_state_);
805
806 3010x return {};
807 }
808
809 inline void
810 15045x epoll_socket_service::close(io_object::handle& h)
811 {
812 15045x static_cast<epoll_socket*>(h.get())->close_socket();
813 15045x }
814
815 inline void
816 66884x epoll_socket_service::post(epoll_op* op)
817 {
818 66884x state_->sched_.post(op);
819 66884x }
820
821 inline void
822 3195x epoll_socket_service::work_started() noexcept
823 {
824 3195x state_->sched_.work_started();
825 3195x }
826
827 inline void
828 196x epoll_socket_service::work_finished() noexcept
829 {
830 196x state_->sched_.work_finished();
831 196x }
832
833 } // namespace boost::corosio::detail
834
835 #endif // BOOST_COROSIO_HAS_EPOLL
836
837 #endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_SERVICE_HPP
838