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libs/corosio/src/corosio/src/detail/timer_service.cpp
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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 #include "src/detail/timer_service.hpp"
11
12 #include <boost/corosio/detail/scheduler.hpp>
13 #include "src/detail/scheduler_op.hpp"
14 #include <boost/capy/error.hpp>
15 #include <boost/capy/ex/executor_ref.hpp>
16 #include <system_error>
17
18 #include <coroutine>
19 #include <limits>
20 #include <mutex>
21 #include <stdexcept>
22 #include <stop_token>
23 #include <vector>
24
25 /*
26 Timer Service
27 =============
28
29 The public timer class holds an opaque timer_impl* and forwards
30 all operations through extern free functions defined at the bottom
31 of this file.
32
33 Data Structures
34 ---------------
35 timer_impl holds per-timer state: expiry, coroutine handle,
36 executor, embedded completion_op, heap index, and free-list link.
37
38 timer_service_impl owns a min-heap of active timers and a free
39 list of recycled impls. The heap is ordered by expiry time; the
40 scheduler queries nearest_expiry() to set the epoll/timerfd
41 timeout.
42
43 Optimization Strategy
44 ---------------------
45 The common timer lifecycle is: construct, set expiry, cancel or
46 wait, destroy. Several optimizations target this path:
47
48 1. Deferred heap insertion — expires_after() stores the expiry
49 but does not insert into the heap. Insertion happens in
50 wait(). If the timer is cancelled or destroyed before wait(),
51 the heap is never touched and no mutex is taken. This also
52 enables the already-expired fast path: when wait() sees
53 expiry <= now before inserting, it posts the coroutine
54 handle to the executor and returns noop_coroutine — no
55 heap, no mutex, no epoll. This is only possible because
56 the coroutine API guarantees wait() always follows
57 expires_after(); callback APIs cannot assume this call
58 order.
59
60 2. Thread-local impl cache — A single-slot per-thread cache of
61 timer_impl avoids the mutex on create/destroy for the common
62 create-then-destroy-on-same-thread pattern. The RAII wrapper
63 tl_impl_cache deletes the cached impl when the thread exits.
64
65 3. Thread-local service cache — Caches the {context, service}
66 pair per-thread to skip find_service() on every timer
67 construction.
68
69 4. Embedded completion_op — timer_impl embeds a scheduler_op
70 subclass, eliminating heap allocation per fire/cancel. Its
71 destroy() is a no-op since the timer_impl owns the lifetime.
72
73 5. Cached nearest expiry — An atomic<int64_t> mirrors the heap
74 root's time, updated under the lock. nearest_expiry() and
75 empty() read the atomic without locking.
76
77 6. might_have_pending_waits_ flag — Set on wait(), cleared on
78 cancel. Lets cancel_timer() return without locking when no
79 wait was ever issued.
80
81 With all fast paths hit (idle timer, same thread), the
82 schedule/cancel cycle takes zero mutex locks.
83 */
84
85 namespace boost::corosio::detail {
86
87 class timer_service_impl;
88
89 void timer_service_invalidate_cache() noexcept;
90
91 struct timer_impl
92 : timer::timer_impl
93 {
94 using clock_type = std::chrono::steady_clock;
95 using time_point = clock_type::time_point;
96 using duration = clock_type::duration;
97
98 // Embedded completion op — avoids heap allocation per fire/cancel
99 struct completion_op final : scheduler_op
100 {
101 timer_impl* impl_ = nullptr;
102
103 static void do_complete(
104 void* owner,
105 scheduler_op* base,
106 std::uint32_t,
107 std::uint32_t);
108
109 129 completion_op() noexcept
110 129 : scheduler_op(&do_complete)
111 {
112 129 }
113
114 void operator()() override;
115 // No-op — lifetime owned by timer_impl, not the scheduler queue
116 ✗ void destroy() override {}
117 };
118
119 timer_service_impl* svc_ = nullptr;
120 time_point expiry_;
121 std::size_t heap_index_ = (std::numeric_limits<std::size_t>::max)();
122 // Lets cancel_timer() skip the lock when no wait() was ever issued
123 bool might_have_pending_waits_ = false;
124
125 // Wait operation state
126 std::coroutine_handle<> h_;
127 capy::executor_ref d_;
128 std::error_code* ec_out_ = nullptr;
129 std::stop_token token_;
130 bool waiting_ = false;
131
132 completion_op op_;
133 std::error_code ec_value_;
134
135 // Free list linkage (reused when impl is on free_list)
136 timer_impl* next_free_ = nullptr;
137
138 129 explicit timer_impl(timer_service_impl& svc) noexcept
139 129 : svc_(&svc)
140 {
141 129 op_.impl_ = this;
142 129 }
143
144 void release() override;
145
146 std::coroutine_handle<> wait(
147 std::coroutine_handle<>,
148 capy::executor_ref,
149 std::stop_token,
150 std::error_code*) override;
151 };
152
153 timer_impl* try_pop_tl_cache(timer_service_impl*) noexcept;
154 bool try_push_tl_cache(timer_impl*) noexcept;
155
156 class timer_service_impl : public timer_service
157 {
158 public:
159 using clock_type = std::chrono::steady_clock;
160 using time_point = clock_type::time_point;
161 using key_type = timer_service;
162
163 private:
164 struct heap_entry
165 {
166 time_point time_;
167 timer_impl* timer_;
168 };
169
170 scheduler* sched_ = nullptr;
171 mutable std::mutex mutex_;
172 std::vector<heap_entry> heap_;
173 timer_impl* free_list_ = nullptr;
174 // Tracks impls not on free-list, for shutdown correctness
175 std::size_t live_count_ = 0;
176 callback on_earliest_changed_;
177 // Avoids mutex in nearest_expiry() and empty()
178 mutable std::atomic<std::int64_t> cached_nearest_ns_{
179 (std::numeric_limits<std::int64_t>::max)()};
180
181 public:
182 309 timer_service_impl(capy::execution_context&, scheduler& sched)
183 309 : timer_service()
184 309 , sched_(&sched)
185 {
186 309 }
187
188 8340 scheduler& get_scheduler() noexcept { return *sched_; }
189
190 618 ~timer_service_impl() = default;
191
192 timer_service_impl(timer_service_impl const&) = delete;
193 timer_service_impl& operator=(timer_service_impl const&) = delete;
194
195 309 void set_on_earliest_changed(callback cb) override
196 {
197 309 on_earliest_changed_ = cb;
198 309 }
199
200 309 void shutdown() override
201 {
202 309 timer_service_invalidate_cache();
203
204 // Cancel waiting timers still in the heap
205
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 309 for (auto& entry : heap_)
206 {
207 ✗ auto* impl = entry.timer_;
208 ✗ if (impl->waiting_)
209 {
210 ✗ impl->waiting_ = false;
211 ✗ impl->h_.destroy();
212 ✗ sched_->on_work_finished();
213 }
214 ✗ impl->heap_index_ = (std::numeric_limits<std::size_t>::max)();
215 ✗ delete impl;
216 ✗ --live_count_;
217 }
218 309 heap_.clear();
219 309 cached_nearest_ns_.store(
220 (std::numeric_limits<std::int64_t>::max)(),
221 std::memory_order_release);
222
223 // Delete free-listed impls
224
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 339 while (free_list_)
225 {
226 30 auto* next = free_list_->next_free_;
227
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 30 delete free_list_;
228 30 free_list_ = next;
229 }
230
231 // Any live timers not in heap and not on free list are still
232 // referenced by timer objects — they'll call destroy_impl()
233 // which will delete them (live_count_ tracks this).
234 309 }
235
236 4259 timer::timer_impl* create_impl() override
237 {
238 4259 timer_impl* impl = try_pop_tl_cache(this);
239
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 4259 if (impl)
240 {
241 4130 impl->svc_ = this;
242 4130 impl->heap_index_ = (std::numeric_limits<std::size_t>::max)();
243 4130 impl->might_have_pending_waits_ = false;
244 4130 return impl;
245 }
246
247
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 129 std::lock_guard lock(mutex_);
248
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 129 if (free_list_)
249 {
250 ✗ impl = free_list_;
251 ✗ free_list_ = impl->next_free_;
252 ✗ impl->next_free_ = nullptr;
253 ✗ impl->heap_index_ = (std::numeric_limits<std::size_t>::max)();
254 ✗ impl->might_have_pending_waits_ = false;
255 }
256 else
257 {
258
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 129 impl = new timer_impl(*this);
259 }
260 129 ++live_count_;
261 129 return impl;
262 129 }
263
264 4259 void destroy_impl(timer_impl& impl)
265 {
266
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 4259 if (impl.heap_index_ != (std::numeric_limits<std::size_t>::max)())
267 {
268
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 2 std::lock_guard lock(mutex_);
269
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 2 remove_timer_impl(impl);
270 2 refresh_cached_nearest();
271 2 }
272
273
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 4259 if (try_push_tl_cache(&impl))
274 4229 return;
275
276
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 30 std::lock_guard lock(mutex_);
277 30 impl.next_free_ = free_list_;
278 30 free_list_ = &impl;
279 30 --live_count_;
280 30 }
281
282 // Heap insertion deferred to wait() — avoids lock when timer is idle
283 4262 void update_timer(timer_impl& impl, time_point new_time)
284 {
285 bool in_heap =
286 4262 (impl.heap_index_ != (std::numeric_limits<std::size_t>::max)());
287
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 4262 if (!in_heap && !impl.waiting_)
288 4260 return;
289
290 2 bool notify = false;
291 2 bool was_waiting = false;
292
293 {
294
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 2 std::lock_guard lock(mutex_);
295
296
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 2 if (impl.waiting_)
297 {
298 2 was_waiting = true;
299 2 impl.waiting_ = false;
300 }
301
302
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 2 if (impl.heap_index_ < heap_.size())
303 {
304 2 time_point old_time = heap_[impl.heap_index_].time_;
305 2 heap_[impl.heap_index_].time_ = new_time;
306
307
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 2 if (new_time < old_time)
308
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 2 up_heap(impl.heap_index_);
309 else
310 ✗ down_heap(impl.heap_index_);
311
312 2 notify = (impl.heap_index_ == 0);
313 }
314
315 2 refresh_cached_nearest();
316 2 }
317
318
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 2 if (was_waiting)
319 {
320 2 impl.ec_value_ = make_error_code(capy::error::canceled);
321 2 sched_->post(&impl.op_);
322 }
323
324
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 2 if (notify)
325 2 on_earliest_changed_();
326 }
327
328 // Called from wait() when timer hasn't been inserted into the heap yet
329 4170 void insert_timer(timer_impl& impl)
330 {
331 4170 bool notify = false;
332 {
333
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 4170 std::lock_guard lock(mutex_);
334 4170 impl.heap_index_ = heap_.size();
335
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 4170 heap_.push_back({impl.expiry_, &impl});
336
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 4170 up_heap(heap_.size() - 1);
337 4170 notify = (impl.heap_index_ == 0);
338 4170 refresh_cached_nearest();
339 4170 }
340
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 4170 if (notify)
341 4157 on_earliest_changed_();
342 4170 }
343
344 14 void cancel_timer(timer_impl& impl)
345 {
346
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 14 if (!impl.might_have_pending_waits_)
347 10 return;
348
349 // Not in heap and not waiting — just clear the flag
350 4 if (impl.heap_index_ == (std::numeric_limits<std::size_t>::max)()
351
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 4 && !impl.waiting_)
352 {
353 ✗ impl.might_have_pending_waits_ = false;
354 ✗ return;
355 }
356
357 4 bool was_waiting = false;
358
359 {
360
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 4 std::lock_guard lock(mutex_);
361
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 4 remove_timer_impl(impl);
362
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 4 if (impl.waiting_)
363 {
364 4 was_waiting = true;
365 4 impl.waiting_ = false;
366 }
367 4 refresh_cached_nearest();
368 4 }
369
370 4 impl.might_have_pending_waits_ = false;
371
372
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 4 if (was_waiting)
373 {
374 4 impl.ec_value_ = make_error_code(capy::error::canceled);
375 4 sched_->post(&impl.op_);
376 }
377 }
378
379 ✗ bool empty() const noexcept override
380 {
381 ✗ return cached_nearest_ns_.load(std::memory_order_acquire)
382 ✗ == (std::numeric_limits<std::int64_t>::max)();
383 }
384
385 9903 time_point nearest_expiry() const noexcept override
386 {
387 9903 auto ns = cached_nearest_ns_.load(std::memory_order_acquire);
388 9903 return time_point(time_point::duration(ns));
389 }
390
391 81436 std::size_t process_expired() override
392 {
393 81436 std::vector<timer_impl*> expired;
394
395 {
396
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 81436 std::lock_guard lock(mutex_);
397 81436 auto now = clock_type::now();
398
399
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 85600 while (!heap_.empty() && heap_[0].time_ <= now)
400 {
401 4164 timer_impl* t = heap_[0].timer_;
402
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 4164 remove_timer_impl(*t);
403
404
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 4164 if (t->waiting_)
405 {
406 4164 t->waiting_ = false;
407 4164 t->ec_value_ = {};
408
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 4164 expired.push_back(t);
409 }
410 }
411
412 81436 refresh_cached_nearest();
413 81436 }
414
415
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 85600 for (auto* t : expired)
416
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 4164 sched_->post(&t->op_);
417
418 162872 return expired.size();
419 81436 }
420
421 private:
422 85614 void refresh_cached_nearest() noexcept
423 {
424 85614 auto ns = heap_.empty()
425
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 85614 ? (std::numeric_limits<std::int64_t>::max)()
426 85269 : heap_[0].time_.time_since_epoch().count();
427 85614 cached_nearest_ns_.store(ns, std::memory_order_release);
428 85614 }
429
430 4170 void remove_timer_impl(timer_impl& impl)
431 {
432 4170 std::size_t index = impl.heap_index_;
433
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 4170 if (index >= heap_.size())
434 ✗ return; // Not in heap
435
436
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 4170 if (index == heap_.size() - 1)
437 {
438 // Last element, just pop
439 82 impl.heap_index_ = (std::numeric_limits<std::size_t>::max)();
440 82 heap_.pop_back();
441 }
442 else
443 {
444 // Swap with last and reheapify
445 4088 swap_heap(index, heap_.size() - 1);
446 4088 impl.heap_index_ = (std::numeric_limits<std::size_t>::max)();
447 4088 heap_.pop_back();
448
449
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 4088 if (index > 0 && heap_[index].time_ < heap_[(index - 1) / 2].time_)
450 ✗ up_heap(index);
451 else
452 4088 down_heap(index);
453 }
454 }
455
456 4172 void up_heap(std::size_t index)
457 {
458
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 8247 while (index > 0)
459 {
460 4088 std::size_t parent = (index - 1) / 2;
461
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 4088 if (!(heap_[index].time_ < heap_[parent].time_))
462 13 break;
463 4075 swap_heap(index, parent);
464 4075 index = parent;
465 }
466 4172 }
467
468 4088 void down_heap(std::size_t index)
469 {
470 4088 std::size_t child = index * 2 + 1;
471
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 4088 while (child < heap_.size())
472 {
473 2 std::size_t min_child = (child + 1 == heap_.size() ||
474 ✗ heap_[child].time_ < heap_[child + 1].time_)
475
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 2 ? child : child + 1;
476
477
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 2 if (heap_[index].time_ < heap_[min_child].time_)
478 2 break;
479
480 ✗ swap_heap(index, min_child);
481 ✗ index = min_child;
482 ✗ child = index * 2 + 1;
483 }
484 4088 }
485
486 8163 void swap_heap(std::size_t i1, std::size_t i2)
487 {
488 8163 heap_entry tmp = heap_[i1];
489 8163 heap_[i1] = heap_[i2];
490 8163 heap_[i2] = tmp;
491 8163 heap_[i1].timer_->heap_index_ = i1;
492 8163 heap_[i2].timer_->heap_index_ = i2;
493 8163 }
494 };
495
496 void
497 ✗ timer_impl::completion_op::
498 do_complete(
499 void* owner,
500 scheduler_op* base,
501 std::uint32_t,
502 std::uint32_t)
503 {
504 ✗ if (!owner)
505 ✗ return;
506 ✗ static_cast<completion_op*>(base)->operator()();
507 }
508
509 void
510 4170 timer_impl::completion_op::
511 operator()()
512 {
513 4170 auto* impl = impl_;
514
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 4170 if (impl->ec_out_)
515 4170 *impl->ec_out_ = impl->ec_value_;
516
517 4170 auto& sched = impl->svc_->get_scheduler();
518 4170 impl->d_.post(impl->h_);
519 4170 sched.on_work_finished();
520 4170 }
521
522 void
523 4259 timer_impl::
524 release()
525 {
526 4259 svc_->destroy_impl(*this);
527 4259 }
528
529 std::coroutine_handle<>
530 4234 timer_impl::
531 wait(
532 std::coroutine_handle<> h,
533 capy::executor_ref d,
534 std::stop_token token,
535 std::error_code* ec)
536 {
537
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 4234 if (heap_index_ == (std::numeric_limits<std::size_t>::max)())
538 {
539
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 4234 if (expiry_ <= clock_type::now())
540 {
541
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 64 if (ec)
542 64 *ec = {};
543 64 d.post(h);
544 64 return std::noop_coroutine();
545 }
546
547 4170 svc_->insert_timer(*this);
548 }
549
550 4170 h_ = h;
551 4170 d_ = std::move(d);
552 4170 token_ = std::move(token);
553 4170 ec_out_ = ec;
554 4170 waiting_ = true;
555 4170 might_have_pending_waits_ = true;
556 4170 svc_->get_scheduler().on_work_started();
557 4170 return std::noop_coroutine();
558 }
559
560 // Extern free functions called from timer.cpp
561 //
562 // Thread-local caches invalidated by timer_service_invalidate_cache()
563 // during shutdown. The service cache avoids find_service overhead per
564 // timer construction. The impl cache avoids the free-list mutex for
565 // the common create-then-destroy-on-same-thread pattern.
566 static thread_local capy::execution_context* cached_ctx = nullptr;
567 static thread_local timer_service_impl* cached_svc = nullptr;
568
569 // RAII wrapper deletes the cached impl when the thread exits
570 struct tl_impl_cache
571 {
572 timer_impl* ptr = nullptr;
573
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 10 ~tl_impl_cache() { delete ptr; }
574 };
575 static thread_local tl_impl_cache tl_cached_impl;
576
577 timer_impl*
578 4259 try_pop_tl_cache(timer_service_impl* svc) noexcept
579 {
580
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 4259 if (tl_cached_impl.ptr && tl_cached_impl.ptr->svc_ == svc)
581 {
582 4130 auto* impl = tl_cached_impl.ptr;
583 4130 tl_cached_impl.ptr = nullptr;
584 4130 return impl;
585 }
586 129 return nullptr;
587 }
588
589 bool
590 4259 try_push_tl_cache(timer_impl* impl) noexcept
591 {
592
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 4259 if (!tl_cached_impl.ptr)
593 {
594 4229 tl_cached_impl.ptr = impl;
595 4229 return true;
596 }
597 30 return false;
598 }
599
600 void
601 309 timer_service_invalidate_cache() noexcept
602 {
603 309 cached_ctx = nullptr;
604 309 cached_svc = nullptr;
605
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 309 delete tl_cached_impl.ptr;
606 309 tl_cached_impl.ptr = nullptr;
607 309 }
608
609 timer::timer_impl*
610 4259 timer_service_create(capy::execution_context& ctx)
611 {
612
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 4259 if (cached_ctx != &ctx)
613 {
614 101 cached_svc = static_cast<timer_service_impl*>(
615 101 ctx.find_service<timer_service>());
616
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 101 if (!cached_svc)
617 ✗ throw std::runtime_error("timer_service not found");
618 101 cached_ctx = &ctx;
619 }
620 4259 return cached_svc->create_impl();
621 }
622
623 void
624 4259 timer_service_destroy(timer::timer_impl& base) noexcept
625 {
626 4259 static_cast<timer_impl&>(base).release();
627 4259 }
628
629 timer::time_point
630 28 timer_service_expiry(timer::timer_impl& base) noexcept
631 {
632 28 return static_cast<timer_impl&>(base).expiry_;
633 }
634
635 void
636 14 timer_service_expires_at(timer::timer_impl& base, timer::time_point t)
637 {
638 14 auto& impl = static_cast<timer_impl&>(base);
639 14 impl.expiry_ = t;
640 14 impl.svc_->update_timer(impl, t);
641 14 }
642
643 void
644 4248 timer_service_expires_after(timer::timer_impl& base, timer::duration d)
645 {
646 4248 auto& impl = static_cast<timer_impl&>(base);
647
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 4248 impl.expiry_ = timer::clock_type::now() + d;
648 4248 impl.svc_->update_timer(impl, impl.expiry_);
649 4248 }
650
651 void
652 14 timer_service_cancel(timer::timer_impl& base) noexcept
653 {
654 14 auto& impl = static_cast<timer_impl&>(base);
655 14 impl.svc_->cancel_timer(impl);
656 14 }
657
658 timer_service&
659 309 get_timer_service(capy::execution_context& ctx, scheduler& sched)
660 {
661 309 return ctx.make_service<timer_service_impl>(sched);
662 }
663
664 } // namespace boost::corosio::detail
665