. /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   25751 void push(continuation* c) noexcept 72   23183 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   25751 c->reserved = nullptr; 74   23183 c->reserved = nullptr;
HITCBC 75   25751 if(tail_) 75   23183 if(tail_)
HITCBC 76   3428 tail_->reserved = c; 76   3564 tail_->reserved = c;
77   else 77   else
HITCBC 78   22323 head_ = c; 78   19619 head_ = c;
HITCBC 79   25751 tail_ = c; 79   23183 tail_ = c;
HITCBC 80   25751 } 80   23183 }
81   81  
HITCBC 82   28594 continuation* pop() noexcept 82   26048 continuation* pop() noexcept
83   { 83   {
HITCBC 84   28594 if(!head_) 84   26048 if(!head_)
HITCBC 85   2843 return nullptr; 85   2865 return nullptr;
HITCBC 86   25751 continuation* c = head_; 86   23183 continuation* c = head_;
HITCBC 87   25751 head_ = static_cast<continuation*>(head_->reserved); 87   23183 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   25751 if(!head_) 88   23183 if(!head_)
HITCBC 89   22323 tail_ = nullptr; 89   19619 tail_ = nullptr;
HITCBC 90   25751 return c; 90   23183 return c;
91   } 91   }
92   92  
HITCBC 93   45911 bool empty() const noexcept 93   40736 bool empty() const noexcept
94   { 94   {
HITCBC 95   45911 return head_ == nullptr; 95   40736 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   1431 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   2701 running_in_this_thread() const noexcept 113   2712 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   2701 return current_.get() == this; 115   2712 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   2843 drain_abandoned() noexcept 125   2865 drain_abandoned() noexcept
126   { 126   {
HITCBC 127   2843 bool any = false; 127   2865 bool any = false;
128   for(;;) 128   for(;;)
129   { 129   {
130   continuation* c; 130   continuation* c;
131   { 131   {
HITCBC 132   5350 std::lock_guard<std::mutex> lock(mutex_); 132   5398 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 133   5350 c = pop(); 133   5398 c = pop();
HITCBC 134   5350 } 134   5398 }
HITCBC 135   5350 if(!c) 135   5398 if(!c)
HITCBC 136   2843 return any; 136   2865 return any;
HITCBC 137   2507 any = true; 137   2533 any = true;
HITCBC 138   2507 if(c->h && c->h != std::noop_coroutine()) 138   2533 if(c->h && c->h != std::noop_coroutine())
HITCBC 139   2256 capy::abandon(*c); 139   2282 capy::abandon(*c);
HITCBC 140   2507 } 140   2533 }
141   } 141   }
142   142  
HITCBC 143   1420 impl(std::size_t num_threads, std::string_view thread_name_prefix) 143   1431 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 144   1420 : num_threads_(num_threads) 144   1431 : num_threads_(num_threads)
145   { 145   {
HITCBC 146   1420 if(num_threads_ == 0) 146   1431 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   1431 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 152   1420 thread_name_prefix_[n] = '\0'; 152   1431 thread_name_prefix_[n] = '\0';
HITCBC 153   1420 } 153   1431 }
154   154  
155   void 155   void
HITCBC 156   25751 post(continuation& c) 156   23183 post(continuation& c)
157   { 157   {
HITCBC 158   25751 if(!started_.load(std::memory_order_acquire)) 158   23183 if(!started_.load(std::memory_order_acquire))
159   { 159   {
160   { 160   {
HITCBC 161   2568 std::lock_guard<std::mutex> lock(mutex_); 161   2578 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 162   2568 if(stop_) 162   2578 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   2568 } 169   2578 }
HITCBC 170   364 ensure_started(); 170   374 ensure_started();
171   } 171   }
HITCBC 172   23547 std::lock_guard<std::mutex> lock(mutex_); 172   20979 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 173   23547 push(&c); 173   20979 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   23547 work_cv_.notify_one(); 176   20979 work_cv_.notify_one();
HITCBC 177   23547 } 177   20979 }
178   178  
179   void 179   void
HITCBC 180   3578 on_work_started() noexcept 180   3589 on_work_started() noexcept
181   { 181   {
HITCBC 182   3578 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 182   3589 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 183   3578 } 183   3589 }
184   184  
185   void 185   void
HITCBC 186   3278 on_work_finished() noexcept 186   3289 on_work_finished() noexcept
187   { 187   {
HITCBC 188   3278 auto n = outstanding_work_.load(std::memory_order_relaxed); 188   3289 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 189   3287 while(n > 1) 189   3300 while(n > 1)
190   { 190   {
HITCBC 191   906 if(outstanding_work_.compare_exchange_weak( 191   1956 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   444 return; 193   967 return;
194   } 194   }
HITCBC 195   2834 std::lock_guard<std::mutex> lock(mutex_); 195   2322 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 196   2834 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 196   2322 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   2834 if(outstanding_work_.load( 198   2322 if(outstanding_work_.load(
HITCBC 199   2834 std::memory_order_acquire) == 0 && joined_ && !stop_) 199   2322 std::memory_order_acquire) == 0 && joined_ && !stop_)
200   { 200   {
HITCBC 201   695 stop_ = true; 201   715 stop_ = true;
HITCBC 202   695 done_cv_.notify_all(); 202   715 done_cv_.notify_all();
HITCBC 203   695 work_cv_.notify_all(); 203   715 work_cv_.notify_all();
204   } 204   }
HITCBC 205   2834 } 205   2322 }
206   206  
207   void 207   void
HITCBC 208   2697 join() noexcept 208   2719 join() noexcept
209   { 209   {
210   { 210   {
HITCBC 211   2697 std::unique_lock<std::mutex> lock(mutex_); 211   2719 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 212   2697 if(joined_) 212   2719 if(joined_)
HITCBC 213   1277 return; 213   1288 return;
HITCBC 214   1420 joined_ = true; 214   1431 joined_ = true;
215   215  
HITCBC 216   1420 if(outstanding_work_.load( 216   1431 if(outstanding_work_.load(
HITCBC 217   1420 std::memory_order_acquire) == 0) 217   1431 std::memory_order_acquire) == 0)
218   { 218   {
HITCBC 219   370 stop_ = true; 219   362 stop_ = true;
HITCBC 220   370 work_cv_.notify_all(); 220   362 work_cv_.notify_all();
221   } 221   }
222   else 222   else
223   { 223   {
HITCBC 224   1050 done_cv_.wait(lock, [this]{ 224   1069 done_cv_.wait(lock, [this]{
HITCBC 225   2046 return stop_; 225   2085 return stop_;
226   }); 226   });
227   } 227   }
HITCBC 228   2697 } 228   2719 }
229   229  
HITCBC 230   1907 for(auto& t : threads_) 230   1929 for(auto& t : threads_)
HITCBC 231   487 if(t.joinable()) 231   498 if(t.joinable())
HITCBC 232   487 t.join(); 232   498 t.join();
233   } 233   }
234   234  
235   void 235   void
HITCBC 236   1723 stop() noexcept 236   1734 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   1734 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 241   1723 stop_ = true; 241   1734 stop_ = true;
HITCBC 242   1723 work_cv_.notify_all(); 242   1734 work_cv_.notify_all();
HITCBC 243   1723 done_cv_.notify_all(); 243   1734 done_cv_.notify_all();
HITCBC 244   1723 } 244   1734 }
245   245  
246   private: 246   private:
247   void 247   void
HITCBC 248   364 ensure_started() 248   374 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   364 std::lock_guard<std::mutex> lock(mutex_); 253   374 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 254   364 if(started_.load(std::memory_order_relaxed) || stop_) 254   374 if(started_.load(std::memory_order_relaxed) || stop_)
MISLBC 255   1 return; 255   ✗ return;
HITCBC 256   363 threads_.reserve(num_threads_); 256   374 threads_.reserve(num_threads_);
HITCBC 257   850 for(std::size_t i = 0; i < num_threads_; ++i) 257   872 for(std::size_t i = 0; i < num_threads_; ++i)
HITCBC 258   974 threads_.emplace_back([this, i]{ run(i); }); 258   996 threads_.emplace_back([this, i]{ run(i); });
HITCBC 259   363 started_.store(true, std::memory_order_release); 259   374 started_.store(true, std::memory_order_release);
HITCBC 260   364 } 260   374 }
261   261  
262   void 262   void
HITCBC 263   487 run(std::size_t index) 263   498 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   498 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 268   487 set_current_thread_name(name); 268   498 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   498 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 275   487 ~scoped_pool() noexcept { current_.set(nullptr); } 275   498 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 276   487 } guard(this); 276   498 } guard(this);
277   277  
278   for(;;) 278   for(;;)
279   { 279   {
HITCBC 280   23731 continuation* c = nullptr; 280   21148 continuation* c = nullptr;
281   { 281   {
HITCBC 282   23731 std::unique_lock<std::mutex> lock(mutex_); 282   21148 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 283   23731 work_cv_.wait(lock, [this]{ 283   21148 work_cv_.wait(lock, [this]{
HITCBC 284   68489 return !empty() || 284   60729 return !empty() ||
HITCBC 285   68489 stop_; 285   60729 stop_;
286   }); 286   });
HITCBC 287   23731 if(stop_) 287   21148 if(stop_)
HITCBC 288   974 return; 288   996 return;
HITCBC 289   23244 c = pop(); 289   20650 c = pop();
HITCBC 290   23731 } 290   21148 }
HITCBC 291   23244 if(c) 291   20650 if(c)
HITCBC 292   23244 safe_resume(c->h); 292   20650 safe_resume(c->h);
HITCBC 293   23244 } 293   20650 }
HITCBC 294   487 } 294   498 }
295   }; 295   };
296   296  
297   //------------------------------------------------------------------------------ 297   //------------------------------------------------------------------------------
298   298  
HITCBC 299   1420 thread_pool:: 299   1431 thread_pool::
300   ~thread_pool() 300   ~thread_pool()
301   { 301   {
HITCBC 302   1420 impl_->stop(); 302   1431 impl_->stop();
HITCBC 303   1420 impl_->join(); 303   1431 impl_->join();
HITCBC 304   1420 shutdown(); 304   1431 shutdown();
HITCBC 305   1420 impl_->drain_abandoned(); 305   1431 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   1423 destroy(); 310   1434 destroy();
311   } 311   }
HITCBC 312   1423 while(impl_->drain_abandoned()); 312   1434 while(impl_->drain_abandoned());
HITCBC 313   1420 delete impl_; 313   1431 delete impl_;
HITCBC 314   1420 } 314   1431 }
315   315  
HITCBC 316   1420 thread_pool:: 316   1431 thread_pool::
HITCBC 317   1420 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 317   1431 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   1431 : impl_(new impl(num_threads, thread_name_prefix))
319   { 319   {
HITCBC 320   1420 this->set_frame_allocator(std::allocator<void>{}); 320   1431 this->set_frame_allocator(std::allocator<void>{});
HITCBC 321   1420 } 321   1431 }
322   322  
323   void 323   void
HITCBC 324   1277 thread_pool:: 324   1288 thread_pool::
325   join() noexcept 325   join() noexcept
326   { 326   {
HITCBC 327   1277 impl_->join(); 327   1288 impl_->join();
HITCBC 328   1277 } 328   1288 }
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   14848 thread_pool::
341   get_executor() const noexcept 341   get_executor() const noexcept
342   { 342   {
HITCBC 343   14837 return executor_type( 343   14848 return executor_type(
HITCBC 344   14837 const_cast<thread_pool&>(*this)); 344   14848 const_cast<thread_pool&>(*this));
345   } 345   }
346   346  
347   void 347   void
HITCBC 348   3578 thread_pool::executor_type:: 348   3589 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   3589 pool_->impl_->on_work_started();
HITCBC 352   3578 } 352   3589 }
353   353  
354   void 354   void
HITCBC 355   3278 thread_pool::executor_type:: 355   3289 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   3289 pool_->impl_->on_work_finished();
HITCBC 359   3278 } 359   3289 }
360   360  
361   void 361   void
HITCBC 362   23057 thread_pool::executor_type:: 362   20478 thread_pool::executor_type::
363   post(continuation& c) const 363   post(continuation& c) const
364   { 364   {
HITCBC 365   23057 pool_->impl_->post(c); 365   20478 pool_->impl_->post(c);
HITCBC 366   23057 } 366   20478 }
367   367  
368   std::coroutine_handle<> 368   std::coroutine_handle<>
HITCBC 369   2701 thread_pool::executor_type:: 369   2712 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   2712 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   2705 pool_->impl_->post(c);
HITCBC 375   2694 return std::noop_coroutine(); 375   2705 return std::noop_coroutine();
376   } 376   }
377   377  
378   } // capy 378   } // capy
379   } // boost 379   } // boost