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 324708x epoll_scheduler& scheduler() const noexcept
134 {
135 324708x 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 4835x epoll_socket::register_op(
155 epoll_op& op,
156 epoll_op*& desc_slot,
157 bool& ready_flag,
158 bool& cancel_flag) noexcept
159 {
160 4835x svc_.work_started();
161
162 4835x std::lock_guard lock(desc_state_.mutex);
163 4835x bool io_done = false;
164 4835x 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 4835x if (cancel_flag)
174 {
175 95x cancel_flag = false;
176 95x op.cancelled.store(true, std::memory_order_relaxed);
177 }
178
179 4835x 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 4740x desc_slot = &op;
187 }
188 4835x }
189
190 inline void
191 105x epoll_op::canceller::operator()() const noexcept
192 {
193 105x op->cancel();
194 105x }
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 99x epoll_read_op::cancel() noexcept
207 {
208 99x if (socket_impl_)
209 99x socket_impl_->cancel_single_op(*this);
210 else
211 ✗ request_cancel();
212 99x }
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 50361x epoll_op::operator()()
225 {
226 50361x stop_cb.reset();
227
228 50361x socket_impl_->svc_.scheduler().reset_inline_budget();
229
230 50361x if (cancelled.load(std::memory_order_acquire))
231 206x *ec_out = capy::error::canceled;
232 50155x else if (errn != 0)
233 ✗ *ec_out = make_err(errn);
234 50155x else if (is_read_operation() && bytes_transferred == 0)
235 ✗ *ec_out = capy::error::eof;
236 else
237 50155x *ec_out = {};
238
239 50361x *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 50361x capy::executor_ref saved_ex(ex);
247 50361x std::coroutine_handle<> saved_h(h);
248 50361x auto prevent_premature_destruction = std::move(impl_ptr);
249 50361x dispatch_coro(saved_ex, saved_h).resume();
250 50361x }
251
252 inline void
253 4633x epoll_connect_op::operator()()
254 {
255 4633x stop_cb.reset();
256
257 4633x socket_impl_->svc_.scheduler().reset_inline_budget();
258
259 4633x bool success = (errn == 0 && !cancelled.load(std::memory_order_acquire));
260
261 // Cache endpoints on successful connect
262 4633x if (success && socket_impl_)
263 {
264 4631x endpoint local_ep;
265 4631x sockaddr_storage local_storage{};
266 4631x socklen_t local_len = sizeof(local_storage);
267 4631x if (::getsockname(
268 4631x fd, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
269 0)
270 4631x local_ep = from_sockaddr(local_storage);
271 4631x static_cast<epoll_socket*>(socket_impl_)
272 4631x ->set_endpoints(local_ep, target_endpoint);
273 }
274
275 4633x if (cancelled.load(std::memory_order_acquire))
276 ✗ *ec_out = capy::error::canceled;
277 4633x else if (errn != 0)
278 2x *ec_out = make_err(errn);
279 else
280 4631x *ec_out = {};
281
282 // Move to stack before resuming. See epoll_op::operator()() for rationale.
283 4633x capy::executor_ref saved_ex(ex);
284 4633x std::coroutine_handle<> saved_h(h);
285 4633x auto prevent_premature_destruction = std::move(impl_ptr);
286 4633x dispatch_coro(saved_ex, saved_h).resume();
287 4633x }
288
289 13956x inline epoll_socket::epoll_socket(epoll_socket_service& svc) noexcept
290 13956x : svc_(svc)
291 {
292 13956x }
293
294 13956x inline epoll_socket::~epoll_socket() = default;
295
296 inline std::coroutine_handle<>
297 4633x 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 4633x auto& op = conn_;
305
306 4633x sockaddr_storage storage{};
307 socklen_t addrlen =
308 4633x detail::to_sockaddr(ep, detail::socket_family(fd_), storage);
309 4633x int result = ::connect(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen);
310
311 4633x 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 4633x 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 4633x op.reset();
345 4633x op.h = h;
346 4633x op.ex = ex;
347 4633x op.ec_out = ec;
348 4633x op.fd = fd_;
349 4633x op.target_endpoint = ep;
350 4633x op.start(token, this);
351 4633x op.impl_ptr = shared_from_this();
352
353 4633x register_op(
354 4633x op, desc_state_.connect_op, desc_state_.write_ready,
355 4633x desc_state_.connect_cancel_pending);
356 4633x return std::noop_coroutine();
357 }
358
359 inline std::coroutine_handle<>
360 125780x 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 125780x auto& op = rd_;
369 125780x op.reset();
370
371 125780x capy::mutable_buffer bufs[epoll_read_op::max_buffers];
372 125780x op.iovec_count =
373 125780x static_cast<int>(param.copy_to(bufs, epoll_read_op::max_buffers));
374
375 125780x 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 251558x for (int i = 0; i < op.iovec_count; ++i)
390 {
391 125779x op.iovecs[i].iov_base = bufs[i].data();
392 125779x op.iovecs[i].iov_len = bufs[i].size();
393 }
394
395 // Speculative read
396 ssize_t n;
397 do
398 {
399 125779x n = ::readv(fd_, op.iovecs, op.iovec_count);
400 }
401 125779x while (n < 0 && errno == EINTR);
402
403 125779x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
404 {
405 125577x int err = (n < 0) ? errno : 0;
406 125577x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
407
408 125577x if (svc_.scheduler().try_consume_inline_budget())
409 {
410 100508x if (err)
411 ✗ *ec = make_err(err);
412 100508x else if (n == 0)
413 5x *ec = capy::error::eof;
414 else
415 100503x *ec = {};
416 100508x *bytes_out = bytes;
417 100508x return dispatch_coro(ex, h);
418 }
419 25069x op.h = h;
420 25069x op.ex = ex;
421 25069x op.ec_out = ec;
422 25069x op.bytes_out = bytes_out;
423 25069x op.start(token, this);
424 25069x op.impl_ptr = shared_from_this();
425 25069x op.complete(err, bytes);
426 25069x svc_.post(&op);
427 25069x return std::noop_coroutine();
428 }
429
430 // EAGAIN — register with reactor
431 202x op.h = h;
432 202x op.ex = ex;
433 202x op.ec_out = ec;
434 202x op.bytes_out = bytes_out;
435 202x op.fd = fd_;
436 202x op.start(token, this);
437 202x op.impl_ptr = shared_from_this();
438
439 202x register_op(
440 202x op, desc_state_.read_op, desc_state_.read_ready,
441 202x desc_state_.read_cancel_pending);
442 202x return std::noop_coroutine();
443 }
444
445 inline std::coroutine_handle<>
446 125580x 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 125580x auto& op = wr_;
455 125580x op.reset();
456
457 125580x capy::mutable_buffer bufs[epoll_write_op::max_buffers];
458 125580x op.iovec_count =
459 125580x static_cast<int>(param.copy_to(bufs, epoll_write_op::max_buffers));
460
461 125580x 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 251158x for (int i = 0; i < op.iovec_count; ++i)
475 {
476 125579x op.iovecs[i].iov_base = bufs[i].data();
477 125579x op.iovecs[i].iov_len = bufs[i].size();
478 }
479
480 // Speculative write
481 125579x msghdr msg{};
482 125579x msg.msg_iov = op.iovecs;
483 125579x msg.msg_iovlen = static_cast<std::size_t>(op.iovec_count);
484
485 ssize_t n;
486 do
487 {
488 125579x n = ::sendmsg(fd_, &msg, MSG_NOSIGNAL);
489 }
490 125579x while (n < 0 && errno == EINTR);
491
492 125579x if (n >= 0 || (errno != EAGAIN && errno != EWOULDBLOCK))
493 {
494 125579x int err = (n < 0) ? errno : 0;
495 125579x auto bytes = (n > 0) ? static_cast<std::size_t>(n) : std::size_t(0);
496
497 125579x if (svc_.scheduler().try_consume_inline_budget())
498 {
499 100491x *ec = err ? make_err(err) : std::error_code{};
500 100491x *bytes_out = bytes;
501 100491x return dispatch_coro(ex, h);
502 }
503 25088x op.h = h;
504 25088x op.ex = ex;
505 25088x op.ec_out = ec;
506 25088x op.bytes_out = bytes_out;
507 25088x op.start(token, this);
508 25088x op.impl_ptr = shared_from_this();
509 25088x op.complete(err, bytes);
510 25088x svc_.post(&op);
511 25088x 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 99x epoll_socket::cancel_single_op(epoll_op& op) noexcept
625 {
626 99x auto self = weak_from_this().lock();
627 99x if (!self)
628 ✗ return;
629
630 99x op.request_cancel();
631
632 99x epoll_op** desc_op_ptr = nullptr;
633 99x if (&op == &conn_)
634 ✗ desc_op_ptr = &desc_state_.connect_op;
635 99x else if (&op == &rd_)
636 99x desc_op_ptr = &desc_state_.read_op;
637 ✗ else if (&op == &wr_)
638 ✗ desc_op_ptr = &desc_state_.write_op;
639
640 99x if (desc_op_ptr)
641 {
642 99x epoll_op* claimed = nullptr;
643 {
644 99x std::lock_guard lock(desc_state_.mutex);
645 99x if (*desc_op_ptr == &op)
646 99x 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 99x }
654 99x if (claimed)
655 {
656 99x op.impl_ptr = self;
657 99x svc_.post(&op);
658 99x svc_.work_finished();
659 }
660 }
661 99x }
662
663 inline void
664 41839x epoll_socket::close_socket() noexcept
665 {
666 41839x auto self = weak_from_this().lock();
667 41839x if (self)
668 {
669 41839x conn_.request_cancel();
670 41839x rd_.request_cancel();
671 41839x wr_.request_cancel();
672
673 41839x epoll_op* conn_claimed = nullptr;
674 41839x epoll_op* rd_claimed = nullptr;
675 41839x epoll_op* wr_claimed = nullptr;
676 {
677 41839x std::lock_guard lock(desc_state_.mutex);
678 41839x conn_claimed = std::exchange(desc_state_.connect_op, nullptr);
679 41839x rd_claimed = std::exchange(desc_state_.read_op, nullptr);
680 41839x wr_claimed = std::exchange(desc_state_.write_op, nullptr);
681 41839x desc_state_.read_ready = false;
682 41839x desc_state_.write_ready = false;
683 41839x desc_state_.read_cancel_pending = false;
684 41839x desc_state_.write_cancel_pending = false;
685 41839x desc_state_.connect_cancel_pending = false;
686 41839x }
687
688 41839x if (conn_claimed)
689 {
690 ✗ conn_.impl_ptr = self;
691 ✗ svc_.post(&conn_);
692 ✗ svc_.work_finished();
693 }
694 41839x if (rd_claimed)
695 {
696 1x rd_.impl_ptr = self;
697 1x svc_.post(&rd_);
698 1x svc_.work_finished();
699 }
700 41839x if (wr_claimed)
701 {
702 ✗ wr_.impl_ptr = self;
703 ✗ svc_.post(&wr_);
704 ✗ svc_.work_finished();
705 }
706
707 41839x if (desc_state_.is_enqueued_.load(std::memory_order_acquire))
708 97x desc_state_.impl_ref_ = self;
709 }
710
711 41839x if (fd_ >= 0)
712 {
713 9279x if (desc_state_.registered_events != 0)
714 9279x svc_.scheduler().deregister_descriptor(fd_);
715 9279x ::close(fd_);
716 9279x fd_ = -1;
717 }
718
719 41839x desc_state_.fd = -1;
720 41839x desc_state_.registered_events = 0;
721
722 41839x local_endpoint_ = endpoint{};
723 41839x remote_endpoint_ = endpoint{};
724 41839x }
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 13956x epoll_socket_service::construct()
754 {
755 13956x auto impl = std::make_shared<epoll_socket>(*this);
756 13956x auto* raw = impl.get();
757
758 {
759 13956x std::lock_guard lock(state_->mutex_);
760 13956x state_->socket_list_.push_back(raw);
761 13956x state_->socket_ptrs_.emplace(raw, std::move(impl));
762 13956x }
763
764 13956x return raw;
765 13956x }
766
767 inline void
768 13956x epoll_socket_service::destroy(io_object::implementation* impl)
769 {
770 13956x auto* epoll_impl = static_cast<epoll_socket*>(impl);
771 13956x epoll_impl->close_socket();
772 13956x std::lock_guard lock(state_->mutex_);
773 13956x state_->socket_list_.remove(epoll_impl);
774 13956x state_->socket_ptrs_.erase(epoll_impl);
775 13956x }
776
777 inline std::error_code
778 4648x epoll_socket_service::open_socket(
779 tcp_socket::implementation& impl, int family, int type, int protocol)
780 {
781 4648x auto* epoll_impl = static_cast<epoll_socket*>(&impl);
782 4648x epoll_impl->close_socket();
783
784 4648x int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
785 4648x if (fd < 0)
786 ✗ return make_err(errno);
787
788 4648x if (family == AF_INET6)
789 {
790 5x int one = 1;
791 5x ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
792 }
793
794 4648x epoll_impl->fd_ = fd;
795
796 // Register fd with epoll (edge-triggered mode)
797 4648x epoll_impl->desc_state_.fd = fd;
798 {
799 4648x std::lock_guard lock(epoll_impl->desc_state_.mutex);
800 4648x epoll_impl->desc_state_.read_op = nullptr;
801 4648x epoll_impl->desc_state_.write_op = nullptr;
802 4648x epoll_impl->desc_state_.connect_op = nullptr;
803 4648x }
804 4648x scheduler().register_descriptor(fd, &epoll_impl->desc_state_);
805
806 4648x return {};
807 }
808
809 inline void
810 23235x epoll_socket_service::close(io_object::handle& h)
811 {
812 23235x static_cast<epoll_socket*>(h.get())->close_socket();
813 23235x }
814
815 inline void
816 50357x epoll_socket_service::post(epoll_op* op)
817 {
818 50357x state_->sched_.post(op);
819 50357x }
820
821 inline void
822 4835x epoll_socket_service::work_started() noexcept
823 {
824 4835x state_->sched_.work_started();
825 4835x }
826
827 inline void
828 198x epoll_socket_service::work_finished() noexcept
829 {
830 198x state_->sched_.work_finished();
831 198x }
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