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 304079x epoll_scheduler& scheduler() const noexcept
134 {
135 304079x 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 4767x epoll_socket::register_op(
155 epoll_op& op,
156 epoll_op*& desc_slot,
157 bool& ready_flag,
158 bool& cancel_flag) noexcept
159 {
160 4767x svc_.work_started();
161
162 4767x std::lock_guard lock(desc_state_.mutex);
163 4767x bool io_done = false;
164 4767x if (ready_flag)
165 {
166 142x ready_flag = false;
167 142x op.perform_io();
168 142x io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
169 142x if (!io_done)
170 142x op.errn = 0;
171 }
172
173 4767x if (cancel_flag)
174 {
175 95x cancel_flag = false;
176 95x op.cancelled.store(true, std::memory_order_relaxed);
177 }
178
179 4767x if (io_done || op.cancelled.load(std::memory_order_acquire))
180 {
181 95x svc_.post(&op);
182 95x svc_.work_finished();
183 }
184 else
185 {
186 4672x desc_slot = &op;
187 }
188 4767x }
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 46978x epoll_op::operator()()
225 {
226 46978x stop_cb.reset();
227
228 46978x socket_impl_->svc_.scheduler().reset_inline_budget();
229
230 46978x if (cancelled.load(std::memory_order_acquire))
231 205x *ec_out = capy::error::canceled;
232 46773x else if (errn != 0)
233 ✗ *ec_out = make_err(errn);
234 46773x else if (is_read_operation() && bytes_transferred == 0)
235 ✗ *ec_out = capy::error::eof;
236 else
237 46773x *ec_out = {};
238
239 46978x *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 46978x capy::executor_ref saved_ex(ex);
247 46978x std::coroutine_handle<> saved_h(h);
248 46978x auto prevent_premature_destruction = std::move(impl_ptr);
249 46978x dispatch_coro(saved_ex, saved_h).resume();
250 46978x }
251
252 inline void
253 4566x epoll_connect_op::operator()()
254 {
255 4566x stop_cb.reset();
256
257 4566x socket_impl_->svc_.scheduler().reset_inline_budget();
258
259 4566x bool success = (errn == 0 && !cancelled.load(std::memory_order_acquire));
260
261 // Cache endpoints on successful connect
262 4566x if (success && socket_impl_)
263 {
264 4564x endpoint local_ep;
265 4564x sockaddr_storage local_storage{};
266 4564x socklen_t local_len = sizeof(local_storage);
267 4564x if (::getsockname(
268 4564x fd, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
269 0)
270 4564x local_ep = from_sockaddr(local_storage);
271 4564x static_cast<epoll_socket*>(socket_impl_)
272 4564x ->set_endpoints(local_ep, target_endpoint);
273 }
274
275 4566x if (cancelled.load(std::memory_order_acquire))
276 ✗ *ec_out = capy::error::canceled;
277 4566x else if (errn != 0)
278 2x *ec_out = make_err(errn);
279 else
280 4564x *ec_out = {};
281
282 // Move to stack before resuming. See epoll_op::operator()() for rationale.
283 4566x capy::executor_ref saved_ex(ex);
284 4566x std::coroutine_handle<> saved_h(h);
285 4566x auto prevent_premature_destruction = std::move(impl_ptr);
286 4566x dispatch_coro(saved_ex, saved_h).resume();
287 4566x }
288
289 13755x inline epoll_socket::epoll_socket(epoll_socket_service& svc) noexcept
290 13755x : svc_(svc)
291 {
292 13755x }
293
294 13755x inline epoll_socket::~epoll_socket() = default;
295
296 inline std::coroutine_handle<>
297 4566x 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 4566x auto& op = conn_;
305
306 4566x sockaddr_storage storage{};
307 socklen_t addrlen =
308 4566x detail::to_sockaddr(ep, detail::socket_family(fd_), storage);
309 4566x int result = ::connect(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen);
310
311 4566x 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 4566x 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 4566x op.reset();
345 4566x op.h = h;
346 4566x op.ex = ex;
347 4566x op.ec_out = ec;
348 4566x op.fd = fd_;
349 4566x op.target_endpoint = ep;
350 4566x op.start(token, this);
351 4566x op.impl_ptr = shared_from_this();
352
353 4566x register_op(
354 4566x op, desc_state_.connect_op, desc_state_.write_ready,
355 4566x desc_state_.connect_cancel_pending);
356 4566x return std::noop_coroutine();
357 }
358
359 inline std::coroutine_handle<>
360 117324x 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 117324x auto& op = rd_;
369 117324x op.reset();
370
371 117324x capy::mutable_buffer bufs[epoll_read_op::max_buffers];
372 117324x op.iovec_count =
373 117324x static_cast<int>(param.copy_to(bufs, epoll_read_op::max_buffers));
374
375 117324x 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 234646x for (int i = 0; i < op.iovec_count; ++i)
390 {
391 117323x op.iovecs[i].iov_base = bufs[i].data();
392 117323x op.iovecs[i].iov_len = bufs[i].size();
393 }
394
395 // Speculative read
396 ssize_t n;
397 do
398 {
399 117323x n = ::readv(fd_, op.iovecs, op.iovec_count);
400 }
401 117323x while (n < 0 && errno == EINTR);
402
403 117323x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
404 {
405 117122x int err = (n < 0) ? errno : 0;
406 117122x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
407
408 117122x if (svc_.scheduler().try_consume_inline_budget())
409 {
410 93744x if (err)
411 ✗ *ec = make_err(err);
412 93744x else if (n == 0)
413 5x *ec = capy::error::eof;
414 else
415 93739x *ec = {};
416 93744x *bytes_out = bytes;
417 93744x return dispatch_coro(ex, h);
418 }
419 23378x op.h = h;
420 23378x op.ex = ex;
421 23378x op.ec_out = ec;
422 23378x op.bytes_out = bytes_out;
423 23378x op.start(token, this);
424 23378x op.impl_ptr = shared_from_this();
425 23378x op.complete(err, bytes);
426 23378x svc_.post(&op);
427 23378x return std::noop_coroutine();
428 }
429
430 // EAGAIN — register with reactor
431 201x op.h = h;
432 201x op.ex = ex;
433 201x op.ec_out = ec;
434 201x op.bytes_out = bytes_out;
435 201x op.fd = fd_;
436 201x op.start(token, this);
437 201x op.impl_ptr = shared_from_this();
438
439 201x register_op(
440 201x op, desc_state_.read_op, desc_state_.read_ready,
441 201x desc_state_.read_cancel_pending);
442 201x return std::noop_coroutine();
443 }
444
445 inline std::coroutine_handle<>
446 117124x 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 117124x auto& op = wr_;
455 117124x op.reset();
456
457 117124x capy::mutable_buffer bufs[epoll_write_op::max_buffers];
458 117124x op.iovec_count =
459 117124x static_cast<int>(param.copy_to(bufs, epoll_write_op::max_buffers));
460
461 117124x 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 234246x for (int i = 0; i < op.iovec_count; ++i)
475 {
476 117123x op.iovecs[i].iov_base = bufs[i].data();
477 117123x op.iovecs[i].iov_len = bufs[i].size();
478 }
479
480 // Speculative write
481 117123x msghdr msg{};
482 117123x msg.msg_iov = op.iovecs;
483 117123x msg.msg_iovlen = static_cast<std::size_t>(op.iovec_count);
484
485 ssize_t n;
486 do
487 {
488 117123x n = ::sendmsg(fd_, &msg, MSG_NOSIGNAL);
489 }
490 117123x while (n < 0 && errno == EINTR);
491
492 117123x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
493 {
494 117123x int err = (n < 0) ? errno : 0;
495 117123x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
496
497 117123x if (svc_.scheduler().try_consume_inline_budget())
498 {
499 93726x *ec = err ? make_err(err) : std::error_code{};
500 93726x *bytes_out = bytes;
501 93726x return dispatch_coro(ex, h);
502 }
503 23397x op.h = h;
504 23397x op.ex = ex;
505 23397x op.ec_out = ec;
506 23397x op.bytes_out = bytes_out;
507 23397x op.start(token, this);
508 23397x op.impl_ptr = shared_from_this();
509 23397x op.complete(err, bytes);
510 23397x svc_.post(&op);
511 23397x 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 187x epoll_socket::cancel() noexcept
575 {
576 187x auto self = weak_from_this().lock();
577 187x if (!self)
578 ✗ return;
579
580 187x conn_.request_cancel();
581 187x rd_.request_cancel();
582 187x wr_.request_cancel();
583
584 187x epoll_op* conn_claimed = nullptr;
585 187x epoll_op* rd_claimed = nullptr;
586 187x epoll_op* wr_claimed = nullptr;
587 {
588 187x std::lock_guard lock(desc_state_.mutex);
589 187x if (desc_state_.connect_op == &conn_)
590 ✗ conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
591 else
592 187x desc_state_.connect_cancel_pending = true;
593 187x if (desc_state_.read_op == &rd_)
594 3x rd_claimed = std::exchange(desc_state_.read_op, nullptr);
595 else
596 184x desc_state_.read_cancel_pending = true;
597 187x if (desc_state_.write_op == &wr_)
598 ✗ wr_claimed = std::exchange(desc_state_.write_op, nullptr);
599 else
600 187x desc_state_.write_cancel_pending = true;
601 187x }
602
603 187x if (conn_claimed)
604 {
605 ✗ conn_.impl_ptr = self;
606 ✗ svc_.post(&conn_);
607 ✗ svc_.work_finished();
608 }
609 187x if (rd_claimed)
610 {
611 3x rd_.impl_ptr = self;
612 3x svc_.post(&rd_);
613 3x svc_.work_finished();
614 }
615 187x if (wr_claimed)
616 {
617 ✗ wr_.impl_ptr = self;
618 ✗ svc_.post(&wr_);
619 ✗ svc_.work_finished();
620 }
621 187x }
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 41236x epoll_socket::close_socket() noexcept
665 {
666 41236x auto self = weak_from_this().lock();
667 41236x if (self)
668 {
669 41236x conn_.request_cancel();
670 41236x rd_.request_cancel();
671 41236x wr_.request_cancel();
672
673 41236x epoll_op* conn_claimed = nullptr;
674 41236x epoll_op* rd_claimed = nullptr;
675 41236x epoll_op* wr_claimed = nullptr;
676 {
677 41236x std::lock_guard lock(desc_state_.mutex);
678 41236x conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
679 41236x rd_claimed = std::exchange(desc_state_.read_op, nullptr);
680 41236x wr_claimed = std::exchange(desc_state_.write_op, nullptr);
681 41236x desc_state_.read_ready = false;
682 41236x desc_state_.write_ready = false;
683 41236x desc_state_.read_cancel_pending = false;
684 41236x desc_state_.write_cancel_pending = false;
685 41236x desc_state_.connect_cancel_pending = false;
686 41236x }
687
688 41236x if (conn_claimed)
689 {
690 ✗ conn_.impl_ptr = self;
691 ✗ svc_.post(&conn_);
692 ✗ svc_.work_finished();
693 }
694 41236x if (rd_claimed)
695 {
696 1x rd_.impl_ptr = self;
697 1x svc_.post(&rd_);
698 1x svc_.work_finished();
699 }
700 41236x if (wr_claimed)
701 {
702 ✗ wr_.impl_ptr = self;
703 ✗ svc_.post(&wr_);
704 ✗ svc_.work_finished();
705 }
706
707 41236x if (desc_state_.is_enqueued_.load(std::memory_order_acquire))
708 97x desc_state_.impl_ref_ = self;
709 }
710
711 41236x if (fd_ >= 0)
712 {
713 9145x if (desc_state_.registered_events != 0)
714 9145x svc_.scheduler().deregister_descriptor(fd_);
715 9145x ::close(fd_);
716 9145x fd_ = -1;
717 }
718
719 41236x desc_state_.fd = -1;
720 41236x desc_state_.registered_events = 0;
721
722 41236x local_endpoint_ = endpoint{};
723 41236x remote_endpoint_ = endpoint{};
724 41236x }
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 13755x epoll_socket_service::construct()
754 {
755 13755x auto impl = std::make_shared<epoll_socket>(*this);
756 13755x auto* raw = impl.get();
757
758 {
759 13755x std::lock_guard lock(state_->mutex_);
760 13755x state_->socket_list_.push_back(raw);
761 13755x state_->socket_ptrs_.emplace(raw, std::move(impl));
762 13755x }
763
764 13755x return raw;
765 13755x }
766
767 inline void
768 13755x epoll_socket_service::destroy(io_object::implementation* impl)
769 {
770 13755x auto* epoll_impl = static_cast<epoll_socket*>(impl);
771 13755x epoll_impl->close_socket();
772 13755x std::lock_guard lock(state_->mutex_);
773 13755x state_->socket_list_.remove(epoll_impl);
774 13755x state_->socket_ptrs_.erase(epoll_impl);
775 13755x }
776
777 inline std::error_code
778 4581x epoll_socket_service::open_socket(
779 tcp_socket::implementation& impl, int family, int type, int protocol)
780 {
781 4581x auto* epoll_impl = static_cast<epoll_socket*>(&impl);
782 4581x epoll_impl->close_socket();
783
784 4581x int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
785 4581x if (fd < 0)
786 ✗ return make_err(errno);
787
788 4581x if (family == AF_INET6)
789 {
790 5x int one = 1;
791 5x ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
792 }
793
794 4581x epoll_impl->fd_ = fd;
795
796 // Register fd with epoll (edge-triggered mode)
797 4581x epoll_impl->desc_state_.fd = fd;
798 {
799 4581x std::lock_guard lock(epoll_impl->desc_state_.mutex);
800 4581x epoll_impl->desc_state_.read_op = nullptr;
801 4581x epoll_impl->desc_state_.write_op = nullptr;
802 4581x epoll_impl->desc_state_.connect_op = nullptr;
803 4581x }
804 4581x scheduler().register_descriptor(fd, &epoll_impl->desc_state_);
805
806 4581x return {};
807 }
808
809 inline void
810 22900x epoll_socket_service::close(io_object::handle& h)
811 {
812 22900x static_cast<epoll_socket*>(h.get())->close_socket();
813 22900x }
814
815 inline void
816 46974x epoll_socket_service::post(epoll_op* op)
817 {
818 46974x state_->sched_.post(op);
819 46974x }
820
821 inline void
822 4767x epoll_socket_service::work_started() noexcept
823 {
824 4767x state_->sched_.work_started();
825 4767x }
826
827 inline void
828 197x epoll_socket_service::work_finished() noexcept
829 {
830 197x state_->sched_.work_finished();
831 197x }
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