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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 16414 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 8305 timer::timer_impl* create_impl() override
237 {
238 8305 timer_impl* impl = try_pop_tl_cache(this);
239
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 8305 if (impl)
240 {
241 8176 impl->svc_ = this;
242 8176 impl->heap_index_ = (std::numeric_limits<std::size_t>::max)();
243 8176 impl->might_have_pending_waits_ = false;
244 8176 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 8305 void destroy_impl(timer_impl& impl)
265 {
266
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 8305 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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 8305 if (try_push_tl_cache(&impl))
274 8275 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 8308 void update_timer(timer_impl& impl, time_point new_time)
284 {
285 bool in_heap =
286 8308 (impl.heap_index_ != (std::numeric_limits<std::size_t>::max)());
287
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 8308 if (!in_heap && !impl.waiting_)
288 8306 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 8207 void insert_timer(timer_impl& impl)
330 {
331 8207 bool notify = false;
332 {
333
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 8207 std::lock_guard lock(mutex_);
334 8207 impl.heap_index_ = heap_.size();
335
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 8207 heap_.push_back({impl.expiry_, &impl});
336
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 8207 up_heap(heap_.size() - 1);
337 8207 notify = (impl.heap_index_ == 0);
338 8207 refresh_cached_nearest();
339 8207 }
340
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 8207 if (notify)
341 8194 on_earliest_changed_();
342 8207 }
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 19635 time_point nearest_expiry() const noexcept override
386 {
387 19635 auto ns = cached_nearest_ns_.load(std::memory_order_acquire);
388 19635 return time_point(time_point::duration(ns));
389 }
390
391 134379 std::size_t process_expired() override
392 {
393 134379 std::vector<timer_impl*> expired;
394
395 {
396
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 134379 std::lock_guard lock(mutex_);
397 134379 auto now = clock_type::now();
398
399
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 142580 while (!heap_.empty() && heap_[0].time_ <= now)
400 {
401 8201 timer_impl* t = heap_[0].timer_;
402
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 8201 remove_timer_impl(*t);
403
404
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 8201 if (t->waiting_)
405 {
406 8201 t->waiting_ = false;
407 8201 t->ec_value_ = {};
408
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 8201 expired.push_back(t);
409 }
410 }
411
412 134379 refresh_cached_nearest();
413 134379 }
414
415
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 142580 for (auto* t : expired)
416
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 8201 sched_->post(&t->op_);
417
418 268758 return expired.size();
419 134379 }
420
421 private:
422 142594 void refresh_cached_nearest() noexcept
423 {
424 142594 auto ns = heap_.empty()
425
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 142594 ? (std::numeric_limits<std::int64_t>::max)()
426 142249 : heap_[0].time_.time_since_epoch().count();
427 142594 cached_nearest_ns_.store(ns, std::memory_order_release);
428 142594 }
429
430 8207 void remove_timer_impl(timer_impl& impl)
431 {
432 8207 std::size_t index = impl.heap_index_;
433
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 8207 if (index >= heap_.size())
434 ✗ return; // Not in heap
435
436
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 8207 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 8125 swap_heap(index, heap_.size() - 1);
446 8125 impl.heap_index_ = (std::numeric_limits<std::size_t>::max)();
447 8125 heap_.pop_back();
448
449
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 8125 if (index > 0 && heap_[index].time_ < heap_[(index - 1) / 2].time_)
450 ✗ up_heap(index);
451 else
452 8125 down_heap(index);
453 }
454 }
455
456 8209 void up_heap(std::size_t index)
457 {
458
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 16321 while (index > 0)
459 {
460 8125 std::size_t parent = (index - 1) / 2;
461
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 8125 if (!(heap_[index].time_ < heap_[parent].time_))
462 13 break;
463 8112 swap_heap(index, parent);
464 8112 index = parent;
465 }
466 8209 }
467
468 8125 void down_heap(std::size_t index)
469 {
470 8125 std::size_t child = index * 2 + 1;
471
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 8125 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 8125 }
485
486 16237 void swap_heap(std::size_t i1, std::size_t i2)
487 {
488 16237 heap_entry tmp = heap_[i1];
489 16237 heap_[i1] = heap_[i2];
490 16237 heap_[i2] = tmp;
491 16237 heap_[i1].timer_->heap_index_ = i1;
492 16237 heap_[i2].timer_->heap_index_ = i2;
493 16237 }
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 8207 timer_impl::completion_op::
511 operator()()
512 {
513 8207 auto* impl = impl_;
514
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 8207 if (impl->ec_out_)
515 8207 *impl->ec_out_ = impl->ec_value_;
516
517 8207 auto& sched = impl->svc_->get_scheduler();
518 8207 impl->d_.post(impl->h_);
519 8207 sched.on_work_finished();
520 8207 }
521
522 void
523 8305 timer_impl::
524 release()
525 {
526 8305 svc_->destroy_impl(*this);
527 8305 }
528
529 std::coroutine_handle<>
530 8280 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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 8280 if (heap_index_ == (std::numeric_limits<std::size_t>::max)())
538 {
539
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 8280 if (expiry_ <= clock_type::now())
540 {
541
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 73 if (ec)
542 73 *ec = {};
543 73 d.post(h);
544 73 return std::noop_coroutine();
545 }
546
547 8207 svc_->insert_timer(*this);
548 }
549
550 8207 h_ = h;
551 8207 d_ = std::move(d);
552 8207 token_ = std::move(token);
553 8207 ec_out_ = ec;
554 8207 waiting_ = true;
555 8207 might_have_pending_waits_ = true;
556 8207 svc_->get_scheduler().on_work_started();
557 8207 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 8305 try_pop_tl_cache(timer_service_impl* svc) noexcept
579 {
580
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 8305 if (tl_cached_impl.ptr && tl_cached_impl.ptr->svc_ == svc)
581 {
582 8176 auto* impl = tl_cached_impl.ptr;
583 8176 tl_cached_impl.ptr = nullptr;
584 8176 return impl;
585 }
586 129 return nullptr;
587 }
588
589 bool
590 8305 try_push_tl_cache(timer_impl* impl) noexcept
591 {
592
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 8305 if (!tl_cached_impl.ptr)
593 {
594 8275 tl_cached_impl.ptr = impl;
595 8275 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 8305 timer_service_create(capy::execution_context& ctx)
611 {
612
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 8305 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 8305 return cached_svc->create_impl();
621 }
622
623 void
624 8305 timer_service_destroy(timer::timer_impl& base) noexcept
625 {
626 8305 static_cast<timer_impl&>(base).release();
627 8305 }
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 8294 timer_service_expires_after(timer::timer_impl& base, timer::duration d)
645 {
646 8294 auto& impl = static_cast<timer_impl&>(base);
647
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 8294 impl.expiry_ = timer::clock_type::now() + d;
648 8294 impl.svc_->update_timer(impl, impl.expiry_);
649 8294 }
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