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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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:
97 239 explicit epoll_socket_state(epoll_scheduler& sched) noexcept : sched_(sched)
98 {
99 239 }
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 351374 epoll_scheduler& scheduler() const noexcept
134 {
135 351374 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 4914 epoll_socket::register_op(
155 epoll_op& op,
156 epoll_op*& desc_slot,
157 bool& ready_flag,
158 bool& cancel_flag) noexcept
159 {
160 4914 svc_.work_started();
161
162 4914 std::lock_guard lock(desc_state_.mutex);
163 4914 bool io_done = false;
164 4914 if (ready_flag)
165 {
166 142 ready_flag = false;
167 142 op.perform_io();
168 142 io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
169 142 if (!io_done)
170 142 op.errn = 0;
171 }
172
173 4914 if (cancel_flag)
174 {
175 95 cancel_flag = false;
176 95 op.cancelled.store(true, std::memory_order_relaxed);
177 }
178
179 4914 if (io_done || op.cancelled.load(std::memory_order_acquire))
180 {
181 95 svc_.post(&op);
182 95 svc_.work_finished();
183 }
184 else
185 {
186 4819 desc_slot = &op;
187 }
188 4914 }
189
190 inline void
191 104 epoll_op::canceller::operator()() const noexcept
192 {
193 104 op->cancel();
194 104 }
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 98 epoll_read_op::cancel() noexcept
207 {
208 98 if (socket_impl_)
209 98 socket_impl_->cancel_single_op(*this);
210 else
211 ✗ request_cancel();
212 98 }
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 54738 epoll_op::operator()()
225 {
226 54738 stop_cb.reset();
227
228 54738 socket_impl_->svc_.scheduler().reset_inline_budget();
229
230 54738 if (cancelled.load(std::memory_order_acquire))
231 205 *ec_out = capy::error::canceled;
232 54533 else if (errn != 0)
233 ✗ *ec_out = make_err(errn);
234 54533 else if (is_read_operation() && bytes_transferred == 0)
235 ✗ *ec_out = capy::error::eof;
236 else
237 54533 *ec_out = {};
238
239 54738 *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 54738 capy::executor_ref saved_ex(ex);
247 54738 std::coroutine_handle<> saved_h(h);
248 54738 auto prevent_premature_destruction = std::move(impl_ptr);
249 54738 dispatch_coro(saved_ex, saved_h).resume();
250 54738 }
251
252 inline void
253 4713 epoll_connect_op::operator()()
254 {
255 4713 stop_cb.reset();
256
257 4713 socket_impl_->svc_.scheduler().reset_inline_budget();
258
259 4713 bool success = (errn == 0 && !cancelled.load(std::memory_order_acquire));
260
261 // Cache endpoints on successful connect
262 4713 if (success && socket_impl_)
263 {
264 4711 endpoint local_ep;
265 4711 sockaddr_storage local_storage{};
266 4711 socklen_t local_len = sizeof(local_storage);
267 4711 if (::getsockname(
268 4711 fd, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
269 0)
270 4711 local_ep = from_sockaddr(local_storage);
271 4711 static_cast<epoll_socket*>(socket_impl_)
272 4711 ->set_endpoints(local_ep, target_endpoint);
273 }
274
275 4713 if (cancelled.load(std::memory_order_acquire))
276 ✗ *ec_out = capy::error::canceled;
277 4713 else if (errn != 0)
278 2 *ec_out = make_err(errn);
279 else
280 4711 *ec_out = {};
281
282 // Move to stack before resuming. See epoll_op::operator()() for rationale.
283 4713 capy::executor_ref saved_ex(ex);
284 4713 std::coroutine_handle<> saved_h(h);
285 4713 auto prevent_premature_destruction = std::move(impl_ptr);
286 4713 dispatch_coro(saved_ex, saved_h).resume();
287 4713 }
288
289 14196 inline epoll_socket::epoll_socket(epoll_socket_service& svc) noexcept
290 14196 : svc_(svc)
291 {
292 14196 }
293
294 14196 inline epoll_socket::~epoll_socket() = default;
295
296 inline std::coroutine_handle<>
297 4713 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 4713 auto& op = conn_;
305
306 4713 sockaddr_storage storage{};
307 socklen_t addrlen =
308 4713 detail::to_sockaddr(ep, detail::socket_family(fd_), storage);
309 4713 int result = ::connect(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen);
310
311 4713 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 4713 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 4713 op.reset();
345 4713 op.h = h;
346 4713 op.ex = ex;
347 4713 op.ec_out = ec;
348 4713 op.fd = fd_;
349 4713 op.target_endpoint = ep;
350 4713 op.start(token, this);
351 4713 op.impl_ptr = shared_from_this();
352
353 4713 register_op(
354 4713 op, desc_state_.connect_op, desc_state_.write_ready,
355 4713 desc_state_.connect_cancel_pending);
356 4713 return std::noop_coroutine();
357 }
358
359 inline std::coroutine_handle<>
360 136724 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 136724 auto& op = rd_;
369 136724 op.reset();
370
371 136724 capy::mutable_buffer bufs[epoll_read_op::max_buffers];
372 136724 op.iovec_count =
373 136724 static_cast<int>(param.copy_to(bufs, epoll_read_op::max_buffers));
374
375 136724 if (op.iovec_count == 0 || (op.iovec_count == 1 && bufs[0].size() == 0))
376 {
377 1 op.empty_buffer_read = true;
378 1 op.h = h;
379 1 op.ex = ex;
380 1 op.ec_out = ec;
381 1 op.bytes_out = bytes_out;
382 1 op.start(token, this);
383 1 op.impl_ptr = shared_from_this();
384 1 op.complete(0, 0);
385 1 svc_.post(&op);
386 1 return std::noop_coroutine();
387 }
388
389 273446 for (int i = 0; i < op.iovec_count; ++i)
390 {
391 136723 op.iovecs[i].iov_base = bufs[i].data();
392 136723 op.iovecs[i].iov_len = bufs[i].size();
393 }
394
395 // Speculative read
396 ssize_t n;
397 do
398 {
399 136723 n = ::readv(fd_, op.iovecs, op.iovec_count);
400 }
401 136723 while (n < 0 && errno == EINTR);
402
403 136723 if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
404 {
405 136522 int err = (n < 0) ? errno : 0;
406 136522 auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
407
408 136522 if (svc_.scheduler().try_consume_inline_budget())
409 {
410 109264 if (err)
411 ✗ *ec = make_err(err);
412 109264 else if (n == 0)
413 5 *ec = capy::error::eof;
414 else
415 109259 *ec = {};
416 109264 *bytes_out = bytes;
417 109264 return dispatch_coro(ex, h);
418 }
419 27258 op.h = h;
420 27258 op.ex = ex;
421 27258 op.ec_out = ec;
422 27258 op.bytes_out = bytes_out;
423 27258 op.start(token, this);
424 27258 op.impl_ptr = shared_from_this();
425 27258 op.complete(err, bytes);
426 27258 svc_.post(&op);
427 27258 return std::noop_coroutine();
428 }
429
430 // EAGAIN — register with reactor
431 201 op.h = h;
432 201 op.ex = ex;
433 201 op.ec_out = ec;
434 201 op.bytes_out = bytes_out;
435 201 op.fd = fd_;
436 201 op.start(token, this);
437 201 op.impl_ptr = shared_from_this();
438
439 201 register_op(
440 201 op, desc_state_.read_op, desc_state_.read_ready,
441 201 desc_state_.read_cancel_pending);
442 201 return std::noop_coroutine();
443 }
444
445 inline std::coroutine_handle<>
446 136524 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 136524 auto& op = wr_;
455 136524 op.reset();
456
457 136524 capy::mutable_buffer bufs[epoll_write_op::max_buffers];
458 136524 op.iovec_count =
459 136524 static_cast<int>(param.copy_to(bufs, epoll_write_op::max_buffers));
460
461 136524 if (op.iovec_count == 0 || (op.iovec_count == 1 && bufs[0].size() == 0))
462 {
463 1 op.h = h;
464 1 op.ex = ex;
465 1 op.ec_out = ec;
466 1 op.bytes_out = bytes_out;
467 1 op.start(token, this);
468 1 op.impl_ptr = shared_from_this();
469 1 op.complete(0, 0);
470 1 svc_.post(&op);
471 1 return std::noop_coroutine();
472 }
473
474 273046 for (int i = 0; i < op.iovec_count; ++i)
475 {
476 136523 op.iovecs[i].iov_base = bufs[i].data();
477 136523 op.iovecs[i].iov_len = bufs[i].size();
478 }
479
480 // Speculative write
481 136523 msghdr msg{};
482 136523 msg.msg_iov = op.iovecs;
483 136523 msg.msg_iovlen = static_cast<std::size_t>(op.iovec_count);
484
485 ssize_t n;
486 do
487 {
488 136523 n = ::sendmsg(fd_, &msg, MSG_NOSIGNAL);
489 }
490 136523 while (n < 0 && errno == EINTR);
491
492 136523 if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
493 {
494 136523 int err = (n < 0) ? errno : 0;
495 136523 auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
496
497 136523 if (svc_.scheduler().try_consume_inline_budget())
498 {
499 109246 *ec = err ? make_err(err) : std::error_code{};
500 109246 *bytes_out = bytes;
501 109246 return dispatch_coro(ex, h);
502 }
503 27277 op.h = h;
504 27277 op.ex = ex;
505 27277 op.ec_out = ec;
506 27277 op.bytes_out = bytes_out;
507 27277 op.start(token, this);
508 27277 op.impl_ptr = shared_from_this();
509 27277 op.complete(err, bytes);
510 27277 svc_.post(&op);
511 27277 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 3 epoll_socket::shutdown(tcp_socket::shutdown_type what) noexcept
531 {
532 int how;
533 3 switch (what)
534 {
535 1 case tcp_socket::shutdown_receive:
536 1 how = SHUT_RD;
537 1 break;
538 1 case tcp_socket::shutdown_send:
539 1 how = SHUT_WR;
540 1 break;
541 1 case tcp_socket::shutdown_both:
542 1 how = SHUT_RDWR;
543 1 break;
544 ✗ default:
545 ✗ return make_err(EINVAL);
546 }
547 3 if (::shutdown(fd_, how) != 0)
548 ✗ return make_err(errno);
549 3 return {};
550 }
551
552 inline std::error_code
553 32 epoll_socket::set_option(
554 int level, int optname, void const* data, std::size_t size) noexcept
555 {
556 32 if (::setsockopt(fd_, level, optname, data, static_cast<socklen_t>(size)) !=
557 0)
558 ✗ return make_err(errno);
559 32 return {};
560 }
561
562 inline std::error_code
563 31 epoll_socket::get_option(
564 int level, int optname, void* data, std::size_t* size) const noexcept
565 {
566 31 socklen_t len = static_cast<socklen_t>(*size);
567 31 if (::getsockopt(fd_, level, optname, data, &len) != 0)
568 ✗ return make_err(errno);
569 31 *size = static_cast<std::size_t>(len);
570 31 return {};
571 }
572
573 inline void
574 187 epoll_socket::cancel() noexcept
575 {
576 187 auto self = weak_from_this().lock();
577 187 if (!self)
578 ✗ return;
579
580 187 conn_.request_cancel();
581 187 rd_.request_cancel();
582 187 wr_.request_cancel();
583
584 187 epoll_op* conn_claimed = nullptr;
585 187 epoll_op* rd_claimed = nullptr;
586 187 epoll_op* wr_claimed = nullptr;
587 {
588 187 std::lock_guard lock(desc_state_.mutex);
589 187 if (desc_state_.connect_op == &conn_)
590 ✗ conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
591 else
592 187 desc_state_.connect_cancel_pending = true;
593 187 if (desc_state_.read_op == &rd_)
594 3 rd_claimed = std::exchange(desc_state_.read_op, nullptr);
595 else
596 184 desc_state_.read_cancel_pending = true;
597 187 if (desc_state_.write_op == &wr_)
598 ✗ wr_claimed = std::exchange(desc_state_.write_op, nullptr);
599 else
600 187 desc_state_.write_cancel_pending = true;
601 187 }
602
603 187 if (conn_claimed)
604 {
605 ✗ conn_.impl_ptr = self;
606 ✗ svc_.post(&conn_);
607 ✗ svc_.work_finished();
608 }
609 187 if (rd_claimed)
610 {
611 3 rd_.impl_ptr = self;
612 3 svc_.post(&rd_);
613 3 svc_.work_finished();
614 }
615 187 if (wr_claimed)
616 {
617 ✗ wr_.impl_ptr = self;
618 ✗ svc_.post(&wr_);
619 ✗ svc_.work_finished();
620 }
621 187 }
622
623 inline void
624 98 epoll_socket::cancel_single_op(epoll_op& op) noexcept
625 {
626 98 auto self = weak_from_this().lock();
627 98 if (!self)
628 ✗ return;
629
630 98 op.request_cancel();
631
632 98 epoll_op** desc_op_ptr = nullptr;
633 98 if (&op == &conn_)
634 ✗ desc_op_ptr = &desc_state_.connect_op;
635 98 else if (&op == &rd_)
636 98 desc_op_ptr = &desc_state_.read_op;
637 ✗ else if (&op == &wr_)
638 ✗ desc_op_ptr = &desc_state_.write_op;
639
640 98 if (desc_op_ptr)
641 {
642 98 epoll_op* claimed = nullptr;
643 {
644 98 std::lock_guard lock(desc_state_.mutex);
645 98 if (*desc_op_ptr == &op)
646 98 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 98 }
654 98 if (claimed)
655 {
656 98 op.impl_ptr = self;
657 98 svc_.post(&op);
658 98 svc_.work_finished();
659 }
660 }
661 98 }
662
663 inline void
664 42559 epoll_socket::close_socket() noexcept
665 {
666 42559 auto self = weak_from_this().lock();
667 42559 if (self)
668 {
669 42559 conn_.request_cancel();
670 42559 rd_.request_cancel();
671 42559 wr_.request_cancel();
672
673 42559 epoll_op* conn_claimed = nullptr;
674 42559 epoll_op* rd_claimed = nullptr;
675 42559 epoll_op* wr_claimed = nullptr;
676 {
677 42559 std::lock_guard lock(desc_state_.mutex);
678 42559 conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
679 42559 rd_claimed = std::exchange(desc_state_.read_op, nullptr);
680 42559 wr_claimed = std::exchange(desc_state_.write_op, nullptr);
681 42559 desc_state_.read_ready = false;
682 42559 desc_state_.write_ready = false;
683 42559 desc_state_.read_cancel_pending = false;
684 42559 desc_state_.write_cancel_pending = false;
685 42559 desc_state_.connect_cancel_pending = false;
686 42559 }
687
688 42559 if (conn_claimed)
689 {
690 ✗ conn_.impl_ptr = self;
691 ✗ svc_.post(&conn_);
692 ✗ svc_.work_finished();
693 }
694 42559 if (rd_claimed)
695 {
696 1 rd_.impl_ptr = self;
697 1 svc_.post(&rd_);
698 1 svc_.work_finished();
699 }
700 42559 if (wr_claimed)
701 {
702 ✗ wr_.impl_ptr = self;
703 ✗ svc_.post(&wr_);
704 ✗ svc_.work_finished();
705 }
706
707 42559 if (desc_state_.is_enqueued_.load(std::memory_order_acquire))
708 97 desc_state_.impl_ref_ = self;
709 }
710
711 42559 if (fd_ >= 0)
712 {
713 9439 if (desc_state_.registered_events != 0)
714 9439 svc_.scheduler().deregister_descriptor(fd_);
715 9439 ::close(fd_);
716 9439 fd_ = -1;
717 }
718
719 42559 desc_state_.fd = -1;
720 42559 desc_state_.registered_events = 0;
721
722 42559 local_endpoint_ = endpoint{};
723 42559 remote_endpoint_ = endpoint{};
724 42559 }
725
726 239 inline epoll_socket_service::epoll_socket_service(capy::execution_context& ctx)
727 239 : state_(
728 std::make_unique<epoll_socket_state>(
729 239 ctx.use_service<epoll_scheduler>()))
730 {
731 239 }
732
733 478 inline epoll_socket_service::~epoll_socket_service() {}
734
735 inline void
736 239 epoll_socket_service::shutdown()
737 {
738 239 std::lock_guard lock(state_->mutex_);
739
740 239 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.
750 239 }
751
752 inline io_object::implementation*
753 14196 epoll_socket_service::construct()
754 {
755 14196 auto impl = std::make_shared<epoll_socket>(*this);
756 14196 auto* raw = impl.get();
757
758 {
759 14196 std::lock_guard lock(state_->mutex_);
760 14196 state_->socket_list_.push_back(raw);
761 14196 state_->socket_ptrs_.emplace(raw, std::move(impl));
762 14196 }
763
764 14196 return raw;
765 14196 }
766
767 inline void
768 14196 epoll_socket_service::destroy(io_object::implementation* impl)
769 {
770 14196 auto* epoll_impl = static_cast<epoll_socket*>(impl);
771 14196 epoll_impl->close_socket();
772 14196 std::lock_guard lock(state_->mutex_);
773 14196 state_->socket_list_.remove(epoll_impl);
774 14196 state_->socket_ptrs_.erase(epoll_impl);
775 14196 }
776
777 inline std::error_code
778 4728 epoll_socket_service::open_socket(
779 tcp_socket::implementation& impl, int family, int type, int protocol)
780 {
781 4728 auto* epoll_impl = static_cast<epoll_socket*>(&impl);
782 4728 epoll_impl->close_socket();
783
784 4728 int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
785 4728 if (fd < 0)
786 ✗ return make_err(errno);
787
788 4728 if (family == AF_INET6)
789 {
790 5 int one = 1;
791 5 ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
792 }
793
794 4728 epoll_impl->fd_ = fd;
795
796 // Register fd with epoll (edge-triggered mode)
797 4728 epoll_impl->desc_state_.fd = fd;
798 {
799 4728 std::lock_guard lock(epoll_impl->desc_state_.mutex);
800 4728 epoll_impl->desc_state_.read_op = nullptr;
801 4728 epoll_impl->desc_state_.write_op = nullptr;
802 4728 epoll_impl->desc_state_.connect_op = nullptr;
803 4728 }
804 4728 scheduler().register_descriptor(fd, &epoll_impl->desc_state_);
805
806 4728 return {};
807 }
808
809 inline void
810 23635 epoll_socket_service::close(io_object::handle& h)
811 {
812 23635 static_cast<epoll_socket*>(h.get())->close_socket();
813 23635 }
814
815 inline void
816 54734 epoll_socket_service::post(epoll_op* op)
817 {
818 54734 state_->sched_.post(op);
819 54734 }
820
821 inline void
822 4914 epoll_socket_service::work_started() noexcept
823 {
824 4914 state_->sched_.work_started();
825 4914 }
826
827 inline void
828 197 epoll_socket_service::work_finished() noexcept
829 {
830 197 state_->sched_.work_finished();
831 197 }
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