. /src /ex /thread_pool.cpp
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1   // 1   //
2   // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
3   // Copyright (c) 2026 Michael Vandeberg 3   // Copyright (c) 2026 Michael Vandeberg
4   // 4   //
5   // Distributed under the Boost Software License, Version 1.0. (See accompanying 5   // Distributed under the Boost Software License, Version 1.0. (See accompanying
6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7   // 7   //
8   // Official repository: https://github.com/boostorg/capy 8   // Official repository: https://github.com/boostorg/capy
9   // 9   //
10   10  
11   #include <boost/capy/ex/thread_pool.hpp> 11   #include <boost/capy/ex/thread_pool.hpp>
12   #include <boost/capy/continuation.hpp> 12   #include <boost/capy/continuation.hpp>
13   #include <boost/capy/detail/thread_local_ptr.hpp> 13   #include <boost/capy/detail/thread_local_ptr.hpp>
14   #include <boost/capy/ex/abandon.hpp> 14   #include <boost/capy/ex/abandon.hpp>
15   #include <boost/capy/ex/frame_allocator.hpp> 15   #include <boost/capy/ex/frame_allocator.hpp>
16   #include <boost/capy/test/thread_name.hpp> 16   #include <boost/capy/test/thread_name.hpp>
17   #include <algorithm> 17   #include <algorithm>
18   #include <atomic> 18   #include <atomic>
19   #include <condition_variable> 19   #include <condition_variable>
20   #include <cstdio> 20   #include <cstdio>
21   #include <mutex> 21   #include <mutex>
22   #include <thread> 22   #include <thread>
23   #include <vector> 23   #include <vector>
24   24  
25   /* 25   /*
26   Thread pool implementation using a shared work queue. 26   Thread pool implementation using a shared work queue.
27   27  
28   Work items are continuations linked via their intrusive next pointer, 28   Work items are continuations linked via their intrusive next pointer,
29   stored in a single queue protected by a mutex. No per-post heap 29   stored in a single queue protected by a mutex. No per-post heap
30   allocation: the continuation is owned by the caller and linked 30   allocation: the continuation is owned by the caller and linked
31   directly. Worker threads wait on a condition_variable until work 31   directly. Worker threads wait on a condition_variable until work
32   is available or stop is requested. 32   is available or stop is requested.
33   33  
34   Threads are started lazily on first post(), under mutex_, to avoid 34   Threads are started lazily on first post(), under mutex_, to avoid
35   spawning threads for pools that are constructed but never used. A 35   spawning threads for pools that are constructed but never used. A
36   stopped pool starts none. Each thread is named 36   stopped pool starts none. Each thread is named
37   with a configurable prefix plus index for debugger visibility. 37   with a configurable prefix plus index for debugger visibility.
38   38  
39   Work tracking: on_work_started/on_work_finished maintain the atomic 39   Work tracking: on_work_started/on_work_finished maintain the atomic
40   outstanding_work_ counter. on_work_started is lock-free, and so is 40   outstanding_work_ counter. on_work_started is lock-free, and so is
41   on_work_finished while the count stays above one. The release that 41   on_work_finished while the count stays above one. The release that
42   may take it to zero is made under mutex_, so join() can't see zero, 42   may take it to zero is made under mutex_, so join() can't see zero,
43   return and let the pool be destroyed while that call still uses it. 43   return and let the pool be destroyed while that call still uses it.
44   join() blocks until this counter reaches zero, then signals workers 44   join() blocks until this counter reaches zero, then signals workers
45   to stop and joins threads. 45   to stop and joins threads.
46   46  
47   Two shutdown paths: 47   Two shutdown paths:
48   - join(): waits for outstanding work to drain, then stops workers. 48   - join(): waits for outstanding work to drain, then stops workers.
49   - stop(): immediately signals workers to exit; queued work stays queued. 49   - stop(): immediately signals workers to exit; queued work stays queued.
50   - Destructor: stop() then join(), then queued work is abandoned. 50   - Destructor: stop() then join(), then queued work is abandoned.
51   */ 51   */
52   52  
53   namespace boost { 53   namespace boost {
54   namespace capy { 54   namespace capy {
55   55  
56   //------------------------------------------------------------------------------ 56   //------------------------------------------------------------------------------
57   57  
58   class thread_pool::impl 58   class thread_pool::impl
59   { 59   {
60   // Identifies the pool owning the current worker thread, or 60   // Identifies the pool owning the current worker thread, or
61   // nullptr if the calling thread is not a pool worker. Checked 61   // nullptr if the calling thread is not a pool worker. Checked
62   // by dispatch() to decide between symmetric transfer (inline 62   // by dispatch() to decide between symmetric transfer (inline
63   // resume) and post. 63   // resume) and post.
64   static inline detail::thread_local_ptr<impl const> current_; 64   static inline detail::thread_local_ptr<impl const> current_;
65   65  
66   // Intrusive queue of continuations: the next link is stored in 66   // Intrusive queue of continuations: the next link is stored in
67   // continuation::reserved (typed continuation* round-tripped through 67   // continuation::reserved (typed continuation* round-tripped through
68   // void*). No per-post allocation: the continuation is owned by the caller. 68   // void*). No per-post allocation: the continuation is owned by the caller.
69   continuation* head_ = nullptr; 69   continuation* head_ = nullptr;
70   continuation* tail_ = nullptr; 70   continuation* tail_ = nullptr;
71   71  
HITCBC 72   23503 void push(continuation* c) noexcept 72   23707 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   23503 c->reserved = nullptr; 74   23707 c->reserved = nullptr;
HITCBC 75   23503 if(tail_) 75   23707 if(tail_)
HITCBC 76   3339 tail_->reserved = c; 76   6627 tail_->reserved = c;
77   else 77   else
HITCBC 78   20164 head_ = c; 78   17080 head_ = c;
HITCBC 79   23503 tail_ = c; 79   23707 tail_ = c;
HITCBC 80   23503 } 80   23707 }
81   81  
HITCBC 82   26347 continuation* pop() noexcept 82   26567 continuation* pop() noexcept
83   { 83   {
HITCBC 84   26347 if(!head_) 84   26567 if(!head_)
HITCBC 85   2844 return nullptr; 85   2860 return nullptr;
HITCBC 86   23503 continuation* c = head_; 86   23707 continuation* c = head_;
HITCBC 87   23503 head_ = static_cast<continuation*>(head_->reserved); 87   23707 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   23503 if(!head_) 88   23707 if(!head_)
HITCBC 89   20164 tail_ = nullptr; 89   17080 tail_ = nullptr;
HITCBC 90   23503 return c; 90   23707 return c;
91   } 91   }
92   92  
HITCBC 93   41577 bool empty() const noexcept 93   38579 bool empty() const noexcept
94   { 94   {
HITCBC 95   41577 return head_ == nullptr; 95   38579 return head_ == nullptr;
96   } 96   }
97   97  
98   std::mutex mutex_; 98   std::mutex mutex_;
99   std::condition_variable work_cv_; 99   std::condition_variable work_cv_;
100   std::condition_variable done_cv_; 100   std::condition_variable done_cv_;
101   std::vector<std::thread> threads_; 101   std::vector<std::thread> threads_;
102   std::atomic<std::size_t> outstanding_work_{0}; 102   std::atomic<std::size_t> outstanding_work_{0};
103   bool stop_{false}; 103   bool stop_{false};
104   bool joined_{false}; 104   bool joined_{false};
105   std::size_t num_threads_; 105   std::size_t num_threads_;
106   char thread_name_prefix_[13]{}; // 12 chars max + null terminator 106   char thread_name_prefix_[13]{}; // 12 chars max + null terminator
107   std::atomic<bool> started_{false}; 107   std::atomic<bool> started_{false};
108   108  
109   public: 109   public:
HITCBC 110   1420 ~impl() = default; 110   1428 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   2701 running_in_this_thread() const noexcept 113   2709 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   2701 return current_.get() == this; 115   2709 return current_.get() == this;
116   } 116   }
117   117  
118   // Abandon queued coroutines. Called after the services shut down, 118   // Abandon queued coroutines. Called after the services shut down,
119   // since their shutdown can post more, and again after they are 119   // since their shutdown can post more, and again after they are
120   // destroyed, for anything their destructors post. Each is taken 120   // destroyed, for anything their destructors post. Each is taken
121   // under the lock, as other threads may still post, and abandoned 121   // under the lock, as other threads may still post, and abandoned
122   // outside it, as abandoning can post. Returns whether there was 122   // outside it, as abandoning can post. Returns whether there was
123   // anything to abandon. 123   // anything to abandon.
124   bool 124   bool
HITCBC 125   2844 drain_abandoned() noexcept 125   2860 drain_abandoned() noexcept
126   { 126   {
HITCBC 127   2844 bool any = false; 127   2860 bool any = false;
128   for(;;) 128   for(;;)
129   { 129   {
130   continuation* c; 130   continuation* c;
131   { 131   {
HITCBC 132   5351 std::lock_guard<std::mutex> lock(mutex_); 132   5411 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 133   5351 c = pop(); 133   5411 c = pop();
HITCBC 134   5351 } 134   5411 }
HITCBC 135   5351 if(!c) 135   5411 if(!c)
HITCBC 136   2844 return any; 136   2860 return any;
HITCBC 137   2507 any = true; 137   2551 any = true;
HITCBC 138   2507 if(c->h && c->h != std::noop_coroutine()) 138   2551 if(c->h && c->h != std::noop_coroutine())
HITCBC 139   2256 capy::abandon(*c); 139   2300 capy::abandon(*c);
HITCBC 140   2507 } 140   2551 }
141   } 141   }
142   142  
HITCBC 143   1420 impl(std::size_t num_threads, std::string_view thread_name_prefix) 143   1428 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 144   1420 : num_threads_(num_threads) 144   1428 : num_threads_(num_threads)
145   { 145   {
HITCBC 146   1420 if(num_threads_ == 0) 146   1428 if(num_threads_ == 0)
HITCBC 147   8 num_threads_ = std::max( 147   8 num_threads_ = std::max(
HITCBC 148   4 std::thread::hardware_concurrency(), 1u); 148   4 std::thread::hardware_concurrency(), 1u);
149   149  
150   // Truncate prefix to 12 chars, leaving room for up to 3-digit index. 150   // Truncate prefix to 12 chars, leaving room for up to 3-digit index.
HITCBC 151   1420 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 151   1428 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 152   1420 thread_name_prefix_[n] = '\0'; 152   1428 thread_name_prefix_[n] = '\0';
HITCBC 153   1420 } 153   1428 }
154   154  
155   void 155   void
HITCBC 156   23503 post(continuation& c) 156   23707 post(continuation& c)
157   { 157   {
HITCBC 158   23503 if(!started_.load(std::memory_order_acquire)) 158   23707 if(!started_.load(std::memory_order_acquire))
159   { 159   {
160   { 160   {
HITCBC 161   2569 std::lock_guard<std::mutex> lock(mutex_); 161   2576 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 162   2569 if(stop_) 162   2576 if(stop_)
163   { 163   {
164   // Stopped before any thread started: nothing will 164   // Stopped before any thread started: nothing will
165   // run it, and the destructor's drain abandons it. 165   // run it, and the destructor's drain abandons it.
HITCBC 166   2204 push(&c); 166   2204 push(&c);
HITCBC 167   2204 return; 167   2204 return;
168   } 168   }
HITCBC 169   2569 } 169   2576 }
HITCBC 170   365 ensure_started(); 170   372 ensure_started();
171   } 171   }
HITCBC 172   21299 std::lock_guard<std::mutex> lock(mutex_); 172   21503 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 173   21299 push(&c); 173   21503 push(&c);
174   // Under the lock so the pool cannot drain, join, and 174   // Under the lock so the pool cannot drain, join, and
175   // destroy the condition variable mid-signal. 175   // destroy the condition variable mid-signal.
HITCBC 176   21299 work_cv_.notify_one(); 176   21503 work_cv_.notify_one();
HITCBC 177   21299 } 177   21503 }
178   178  
179   void 179   void
HITCBC 180   3578 on_work_started() noexcept 180   3586 on_work_started() noexcept
181   { 181   {
HITCBC 182   3578 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 182   3586 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 183   3578 } 183   3586 }
184   184  
185   void 185   void
HITCBC 186   3278 on_work_finished() noexcept 186   3286 on_work_finished() noexcept
187   { 187   {
HITCBC 188   3278 auto n = outstanding_work_.load(std::memory_order_relaxed); 188   3286 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 189   3286 while(n > 1) 189   3292 while(n > 1)
190   { 190   {
HITCBC 191   3032 if(outstanding_work_.compare_exchange_weak( 191   2956 if(outstanding_work_.compare_exchange_weak(
192   n, n - 1, std::memory_order_acq_rel)) 192   n, n - 1, std::memory_order_acq_rel))
HITCBC 193   1508 return; 193   1472 return;
194   } 194   }
HITCBC 195   1770 std::lock_guard<std::mutex> lock(mutex_); 195   1814 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 196   1770 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 196   1814 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel);
197   // Re-read: a concurrent on_work_started() may have raised it. 197   // Re-read: a concurrent on_work_started() may have raised it.
HITCBC 198   1770 if(outstanding_work_.load( 198   1814 if(outstanding_work_.load(
HITCBC 199   1770 std::memory_order_acquire) == 0 && joined_ && !stop_) 199   1814 std::memory_order_acquire) == 0 && joined_ && !stop_)
200   { 200   {
HITCBC 201   691 stop_ = true; 201   694 stop_ = true;
HITCBC 202   691 done_cv_.notify_all(); 202   694 done_cv_.notify_all();
HITCBC 203   691 work_cv_.notify_all(); 203   694 work_cv_.notify_all();
204   } 204   }
HITCBC 205   1770 } 205   1814 }
206   206  
207   void 207   void
HITCBC 208   2697 join() noexcept 208   2713 join() noexcept
209   { 209   {
210   { 210   {
HITCBC 211   2697 std::unique_lock<std::mutex> lock(mutex_); 211   2713 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 212   2697 if(joined_) 212   2713 if(joined_)
HITCBC 213   1277 return; 213   1285 return;
HITCBC 214   1420 joined_ = true; 214   1428 joined_ = true;
215   215  
HITCBC 216   1420 if(outstanding_work_.load( 216   1428 if(outstanding_work_.load(
HITCBC 217   1420 std::memory_order_acquire) == 0) 217   1428 std::memory_order_acquire) == 0)
218   { 218   {
HITCBC 219   374 stop_ = true; 219   378 stop_ = true;
HITCBC 220   374 work_cv_.notify_all(); 220   378 work_cv_.notify_all();
221   } 221   }
222   else 222   else
223   { 223   {
HITCBC 224   1046 done_cv_.wait(lock, [this]{ 224   1050 done_cv_.wait(lock, [this]{
HITCBC 225   2038 return stop_; 225   2045 return stop_;
226   }); 226   });
227   } 227   }
HITCBC 228   2697 } 228   2713 }
229   229  
HITCBC 230   1907 for(auto& t : threads_) 230   1923 for(auto& t : threads_)
HITCBC 231   487 if(t.joinable()) 231   495 if(t.joinable())
HITCBC 232   487 t.join(); 232   495 t.join();
233   } 233   }
234   234  
235   void 235   void
HITCBC 236   1723 stop() noexcept 236   1731 stop() noexcept
237   { 237   {
238   // Under the lock: the join() this releases may return and let 238   // Under the lock: the join() this releases may return and let
239   // the pool be destroyed as soon as the lock is free. 239   // the pool be destroyed as soon as the lock is free.
HITCBC 240   1723 std::lock_guard<std::mutex> lock(mutex_); 240   1731 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 241   1723 stop_ = true; 241   1731 stop_ = true;
HITCBC 242   1723 work_cv_.notify_all(); 242   1731 work_cv_.notify_all();
HITCBC 243   1723 done_cv_.notify_all(); 243   1731 done_cv_.notify_all();
HITCBC 244   1723 } 244   1731 }
245   245  
246   private: 246   private:
247   void 247   void
HITCBC 248   365 ensure_started() 248   372 ensure_started()
249   { 249   {
250   // Under the lock, so join() either sees every thread started 250   // Under the lock, so join() either sees every thread started
251   // here or makes this start none. A joined pool still starts them: 251   // here or makes this start none. A joined pool still starts them:
252   // join() may be waiting on work that needs them. 252   // join() may be waiting on work that needs them.
HITCBC 253   365 std::lock_guard<std::mutex> lock(mutex_); 253   372 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 254   365 if(started_.load(std::memory_order_relaxed) || stop_) 254   372 if(started_.load(std::memory_order_relaxed) || stop_)
HITCBC 255   2 return; 255   1 return;
HITCBC 256   363 threads_.reserve(num_threads_); 256   371 threads_.reserve(num_threads_);
HITCBC 257   850 for(std::size_t i = 0; i < num_threads_; ++i) 257   866 for(std::size_t i = 0; i < num_threads_; ++i)
HITCBC 258   974 threads_.emplace_back([this, i]{ run(i); }); 258   990 threads_.emplace_back([this, i]{ run(i); });
HITCBC 259   363 started_.store(true, std::memory_order_release); 259   371 started_.store(true, std::memory_order_release);
HITCBC 260   365 } 260   372 }
261   261  
262   void 262   void
HITCBC 263   487 run(std::size_t index) 263   495 run(std::size_t index)
264   { 264   {
265   // Build name; set_current_thread_name truncates to platform limits. 265   // Build name; set_current_thread_name truncates to platform limits.
266   char name[16]; 266   char name[16];
HITCBC 267   487 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 267   495 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 268   487 set_current_thread_name(name); 268   495 set_current_thread_name(name);
269   269  
270   // Mark this thread as a worker of this pool so dispatch() 270   // Mark this thread as a worker of this pool so dispatch()
271   // can symmetric-transfer when called from within pool work. 271   // can symmetric-transfer when called from within pool work.
272   struct scoped_pool 272   struct scoped_pool
273   { 273   {
HITCBC 274   487 scoped_pool(impl const* p) noexcept { current_.set(p); } 274   495 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 275   487 ~scoped_pool() noexcept { current_.set(nullptr); } 275   495 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 276   487 } guard(this); 276   495 } guard(this);
277   277  
278   for(;;) 278   for(;;)
279   { 279   {
HITCBC 280   21483 continuation* c = nullptr; 280   21651 continuation* c = nullptr;
281   { 281   {
HITCBC 282   21483 std::unique_lock<std::mutex> lock(mutex_); 282   21651 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 283   21483 work_cv_.wait(lock, [this]{ 283   21651 work_cv_.wait(lock, [this]{
HITCBC 284   62065 return !empty() || 284   55903 return !empty() ||
HITCBC 285   62065 stop_; 285   55903 stop_;
286   }); 286   });
HITCBC 287   21483 if(stop_) 287   21651 if(stop_)
HITCBC 288   974 return; 288   990 return;
HITCBC 289   20996 c = pop(); 289   21156 c = pop();
HITCBC 290   21483 } 290   21651 }
HITCBC 291   20996 if(c) 291   21156 if(c)
HITCBC 292   20996 safe_resume(c->h); 292   21156 safe_resume(c->h);
HITCBC 293   20996 } 293   21156 }
HITCBC 294   487 } 294   495 }
295   }; 295   };
296   296  
297   //------------------------------------------------------------------------------ 297   //------------------------------------------------------------------------------
298   298  
HITCBC 299   1420 thread_pool:: 299   1428 thread_pool::
300   ~thread_pool() 300   ~thread_pool()
301   { 301   {
HITCBC 302   1420 impl_->stop(); 302   1428 impl_->stop();
HITCBC 303   1420 impl_->join(); 303   1428 impl_->join();
HITCBC 304   1420 shutdown(); 304   1428 shutdown();
HITCBC 305   1420 impl_->drain_abandoned(); 305   1428 impl_->drain_abandoned();
306   // A frame the drain unwinds can create a service, whose destructor 306   // A frame the drain unwinds can create a service, whose destructor
307   // can post again: repeat until nothing is left of either. 307   // can post again: repeat until nothing is left of either.
308   do 308   do
309   { 309   {
HITCBC 310   1424 destroy(); 310   1432 destroy();
311   } 311   }
HITCBC 312   1424 while(impl_->drain_abandoned()); 312   1432 while(impl_->drain_abandoned());
HITCBC 313   1420 delete impl_; 313   1428 delete impl_;
HITCBC 314   1420 } 314   1428 }
315   315  
HITCBC 316   1420 thread_pool:: 316   1428 thread_pool::
HITCBC 317   1420 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 317   1428 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 318   1420 : impl_(new impl(num_threads, thread_name_prefix)) 318   1428 : impl_(new impl(num_threads, thread_name_prefix))
319   { 319   {
HITCBC 320   1420 this->set_frame_allocator(std::allocator<void>{}); 320   1428 this->set_frame_allocator(std::allocator<void>{});
HITCBC 321   1420 } 321   1428 }
322   322  
323   void 323   void
HITCBC 324   1277 thread_pool:: 324   1285 thread_pool::
325   join() noexcept 325   join() noexcept
326   { 326   {
HITCBC 327   1277 impl_->join(); 327   1285 impl_->join();
HITCBC 328   1277 } 328   1285 }
329   329  
330   void 330   void
HITCBC 331   303 thread_pool:: 331   303 thread_pool::
332   stop() noexcept 332   stop() noexcept
333   { 333   {
HITCBC 334   303 impl_->stop(); 334   303 impl_->stop();
HITCBC 335   303 } 335   303 }
336   336  
337   //------------------------------------------------------------------------------ 337   //------------------------------------------------------------------------------
338   338  
339   thread_pool::executor_type 339   thread_pool::executor_type
HITCBC 340   14837 thread_pool:: 340   14845 thread_pool::
341   get_executor() const noexcept 341   get_executor() const noexcept
342   { 342   {
HITCBC 343   14837 return executor_type( 343   14845 return executor_type(
HITCBC 344   14837 const_cast<thread_pool&>(*this)); 344   14845 const_cast<thread_pool&>(*this));
345   } 345   }
346   346  
347   void 347   void
HITCBC 348   3578 thread_pool::executor_type:: 348   3586 thread_pool::executor_type::
349   on_work_started() const noexcept 349   on_work_started() const noexcept
350   { 350   {
HITCBC 351   3578 pool_->impl_->on_work_started(); 351   3586 pool_->impl_->on_work_started();
HITCBC 352   3578 } 352   3586 }
353   353  
354   void 354   void
HITCBC 355   3278 thread_pool::executor_type:: 355   3286 thread_pool::executor_type::
356   on_work_finished() const noexcept 356   on_work_finished() const noexcept
357   { 357   {
HITCBC 358   3278 pool_->impl_->on_work_finished(); 358   3286 pool_->impl_->on_work_finished();
HITCBC 359   3278 } 359   3286 }
360   360  
361   void 361   void
HITCBC 362   20809 thread_pool::executor_type:: 362   21005 thread_pool::executor_type::
363   post(continuation& c) const 363   post(continuation& c) const
364   { 364   {
HITCBC 365   20809 pool_->impl_->post(c); 365   21005 pool_->impl_->post(c);
HITCBC 366   20809 } 366   21005 }
367   367  
368   std::coroutine_handle<> 368   std::coroutine_handle<>
HITCBC 369   2701 thread_pool::executor_type:: 369   2709 thread_pool::executor_type::
370   dispatch(continuation& c) const 370   dispatch(continuation& c) const
371   { 371   {
HITCBC 372   2701 if(pool_->impl_->running_in_this_thread()) 372   2709 if(pool_->impl_->running_in_this_thread())
HITCBC 373   7 return c.h; 373   7 return c.h;
HITCBC 374   2694 pool_->impl_->post(c); 374   2702 pool_->impl_->post(c);
HITCBC 375   2694 return std::noop_coroutine(); 375   2702 return std::noop_coroutine();
376   } 376   }
377   377  
378   } // capy 378   } // capy
379   } // boost 379   } // boost