. /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   23349 void push(continuation* c) noexcept 72   25439 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   23349 c->reserved = nullptr; 74   25439 c->reserved = nullptr;
HITCBC 75   23349 if(tail_) 75   25439 if(tail_)
HITCBC 76   4461 tail_->reserved = c; 76   6244 tail_->reserved = c;
77   else 77   else
HITCBC 78   18888 head_ = c; 78   19195 head_ = c;
HITCBC 79   23349 tail_ = c; 79   25439 tail_ = c;
HITCBC 80   23349 } 80   25439 }
81   81  
HITCBC 82   26203 continuation* pop() noexcept 82   28300 continuation* pop() noexcept
83   { 83   {
HITCBC 84   26203 if(!head_) 84   28300 if(!head_)
HITCBC 85   2854 return nullptr; 85   2861 return nullptr;
HITCBC 86   23349 continuation* c = head_; 86   25439 continuation* c = head_;
HITCBC 87   23349 head_ = static_cast<continuation*>(head_->reserved); 87   25439 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   23349 if(!head_) 88   25439 if(!head_)
HITCBC 89   18888 tail_ = nullptr; 89   19195 tail_ = nullptr;
HITCBC 90   23349 return c; 90   25439 return c;
91   } 91   }
92   92  
HITCBC 93   40397 bool empty() const noexcept 93   42255 bool empty() const noexcept
94   { 94   {
HITCBC 95   40397 return head_ == nullptr; 95   42255 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   1425 ~impl() = default; 110   1429 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   2706 running_in_this_thread() const noexcept 113   3210 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   2706 return current_.get() == this; 115   3210 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   2854 drain_abandoned() noexcept 125   2861 drain_abandoned() noexcept
126   { 126   {
HITCBC 127   2854 bool any = false; 127   2861 bool any = false;
128   for(;;) 128   for(;;)
129   { 129   {
130   continuation* c; 130   continuation* c;
131   { 131   {
HITCBC 132   5395 std::lock_guard<std::mutex> lock(mutex_); 132   5404 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 133   5395 c = pop(); 133   5404 c = pop();
HITCBC 134   5395 } 134   5404 }
HITCBC 135   5395 if(!c) 135   5404 if(!c)
HITCBC 136   2854 return any; 136   2861 return any;
HITCBC 137   2541 any = true; 137   2543 any = true;
HITCBC 138   2541 if(c->h && c->h != std::noop_coroutine()) 138   2543 if(c->h && c->h != std::noop_coroutine())
HITCBC 139   2290 capy::abandon(*c); 139   2292 capy::abandon(*c);
HITCBC 140   2541 } 140   2543 }
141   } 141   }
142   142  
HITCBC 143   1425 impl(std::size_t num_threads, std::string_view thread_name_prefix) 143   1429 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 144   1425 : num_threads_(num_threads) 144   1429 : num_threads_(num_threads)
145   { 145   {
HITCBC 146   1425 if(num_threads_ == 0) 146   1429 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   1425 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 151   1429 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 152   1425 thread_name_prefix_[n] = '\0'; 152   1429 thread_name_prefix_[n] = '\0';
HITCBC 153   1425 } 153   1429 }
154   154  
155   void 155   void
HITCBC 156   23349 post(continuation& c) 156   25439 post(continuation& c)
157   { 157   {
HITCBC 158   23349 if(!started_.load(std::memory_order_acquire)) 158   25439 if(!started_.load(std::memory_order_acquire))
159   { 159   {
160   { 160   {
HITCBC 161   2573 std::lock_guard<std::mutex> lock(mutex_); 161   2576 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 162   2573 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   2573 } 169   2576 }
HITCBC 170   369 ensure_started(); 170   372 ensure_started();
171   } 171   }
HITCBC 172   21145 std::lock_guard<std::mutex> lock(mutex_); 172   23235 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 173   21145 push(&c); 173   23235 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   21145 work_cv_.notify_one(); 176   23235 work_cv_.notify_one();
HITCBC 177   21145 } 177   23235 }
178   178  
179   void 179   void
HITCBC 180   3583 on_work_started() noexcept 180   4087 on_work_started() noexcept
181   { 181   {
HITCBC 182   3583 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 182   4087 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 183   3583 } 183   4087 }
184   184  
185   void 185   void
HITCBC 186   3283 on_work_finished() noexcept 186   3787 on_work_finished() noexcept
187   { 187   {
HITCBC 188   3283 auto n = outstanding_work_.load(std::memory_order_relaxed); 188   3787 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 189   3289 while(n > 1) 189   3793 while(n > 1)
190   { 190   {
HITCBC 191   2640 if(outstanding_work_.compare_exchange_weak( 191   2604 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   1314 return; 193   1296 return;
194   } 194   }
HITCBC 195   1969 std::lock_guard<std::mutex> lock(mutex_); 195   2491 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 196   1969 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 196   2491 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   1969 if(outstanding_work_.load( 198   2491 if(outstanding_work_.load(
HITCBC 199   1969 std::memory_order_acquire) == 0 && joined_ && !stop_) 199   2491 std::memory_order_acquire) == 0 && joined_ && !stop_)
200   { 200   {
HITCBC 201   713 stop_ = true; 201   703 stop_ = true;
HITCBC 202   713 done_cv_.notify_all(); 202   703 done_cv_.notify_all();
HITCBC 203   713 work_cv_.notify_all(); 203   703 work_cv_.notify_all();
204   } 204   }
HITCBC 205   1969 } 205   2491 }
206   206  
207   void 207   void
HITCBC 208   2707 join() noexcept 208   2715 join() noexcept
209   { 209   {
210   { 210   {
HITCBC 211   2707 std::unique_lock<std::mutex> lock(mutex_); 211   2715 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 212   2707 if(joined_) 212   2715 if(joined_)
HITCBC 213   1282 return; 213   1286 return;
HITCBC 214   1425 joined_ = true; 214   1429 joined_ = true;
215   215  
HITCBC 216   1425 if(outstanding_work_.load( 216   1429 if(outstanding_work_.load(
HITCBC 217   1425 std::memory_order_acquire) == 0) 217   1429 std::memory_order_acquire) == 0)
218   { 218   {
HITCBC 219   358 stop_ = true; 219   369 stop_ = true;
HITCBC 220   358 work_cv_.notify_all(); 220   369 work_cv_.notify_all();
221   } 221   }
222   else 222   else
223   { 223   {
HITCBC 224   1067 done_cv_.wait(lock, [this]{ 224   1060 done_cv_.wait(lock, [this]{
HITCBC 225   2081 return stop_; 225   2064 return stop_;
226   }); 226   });
227   } 227   }
HITCBC 228   2707 } 228   2715 }
229   229  
HITCBC 230   1917 for(auto& t : threads_) 230   1926 for(auto& t : threads_)
HITCBC 231   492 if(t.joinable()) 231   497 if(t.joinable())
HITCBC 232   492 t.join(); 232   497 t.join();
233   } 233   }
234   234  
235   void 235   void
HITCBC 236   1728 stop() noexcept 236   1732 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   1728 std::lock_guard<std::mutex> lock(mutex_); 240   1732 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 241   1728 stop_ = true; 241   1732 stop_ = true;
HITCBC 242   1728 work_cv_.notify_all(); 242   1732 work_cv_.notify_all();
HITCBC 243   1728 done_cv_.notify_all(); 243   1732 done_cv_.notify_all();
HITCBC 244   1728 } 244   1732 }
245   245  
246   private: 246   private:
247   void 247   void
HITCBC 248   369 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   369 std::lock_guard<std::mutex> lock(mutex_); 253   372 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 254   369 if(started_.load(std::memory_order_relaxed) || stop_) 254   372 if(started_.load(std::memory_order_relaxed) || stop_)
MISLBC 255   1 return; 255   ✗ return;
HITCBC 256   368 threads_.reserve(num_threads_); 256   372 threads_.reserve(num_threads_);
HITCBC 257   860 for(std::size_t i = 0; i < num_threads_; ++i) 257   869 for(std::size_t i = 0; i < num_threads_; ++i)
HITCBC 258   984 threads_.emplace_back([this, i]{ run(i); }); 258   994 threads_.emplace_back([this, i]{ run(i); });
HITCBC 259   368 started_.store(true, std::memory_order_release); 259   372 started_.store(true, std::memory_order_release);
HITCBC 260   369 } 260   372 }
261   261  
262   void 262   void
HITCBC 263   492 run(std::size_t index) 263   497 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   492 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 267   497 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 268   492 set_current_thread_name(name); 268   497 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   492 scoped_pool(impl const* p) noexcept { current_.set(p); } 274   497 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 275   492 ~scoped_pool() noexcept { current_.set(nullptr); } 275   497 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 276   492 } guard(this); 276   497 } guard(this);
277   277  
278   for(;;) 278   for(;;)
279   { 279   {
HITCBC 280   21300 continuation* c = nullptr; 280   23393 continuation* c = nullptr;
281   { 281   {
HITCBC 282   21300 std::unique_lock<std::mutex> lock(mutex_); 282   23393 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 283   21300 work_cv_.wait(lock, [this]{ 283   23393 work_cv_.wait(lock, [this]{
HITCBC 284   59891 return !empty() || 284   61513 return !empty() ||
HITCBC 285   59891 stop_; 285   61513 stop_;
286   }); 286   });
HITCBC 287   21300 if(stop_) 287   23393 if(stop_)
HITCBC 288   984 return; 288   994 return;
HITCBC 289   20808 c = pop(); 289   22896 c = pop();
HITCBC 290   21300 } 290   23393 }
HITCBC 291   20808 if(c) 291   22896 if(c)
HITCBC 292   20808 safe_resume(c->h); 292   22896 safe_resume(c->h);
HITCBC 293   20808 } 293   22896 }
HITCBC 294   492 } 294   497 }
295   }; 295   };
296   296  
297   //------------------------------------------------------------------------------ 297   //------------------------------------------------------------------------------
298   298  
HITCBC 299   1425 thread_pool:: 299   1429 thread_pool::
300   ~thread_pool() 300   ~thread_pool()
301   { 301   {
HITCBC 302   1425 impl_->stop(); 302   1429 impl_->stop();
HITCBC 303   1425 impl_->join(); 303   1429 impl_->join();
HITCBC 304   1425 shutdown(); 304   1429 shutdown();
HITCBC 305   1425 impl_->drain_abandoned(); 305   1429 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   1429 destroy(); 310   1432 destroy();
311   } 311   }
HITCBC 312   1429 while(impl_->drain_abandoned()); 312   1432 while(impl_->drain_abandoned());
HITCBC 313   1425 delete impl_; 313   1429 delete impl_;
HITCBC 314   1425 } 314   1429 }
315   315  
HITCBC 316   1425 thread_pool:: 316   1429 thread_pool::
HITCBC 317   1425 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 317   1429 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 318   1425 : impl_(new impl(num_threads, thread_name_prefix)) 318   1429 : impl_(new impl(num_threads, thread_name_prefix))
319   { 319   {
HITCBC 320   1425 this->set_frame_allocator(std::allocator<void>{}); 320   1429 this->set_frame_allocator(std::allocator<void>{});
HITCBC 321   1425 } 321   1429 }
322   322  
323   void 323   void
HITCBC 324   1282 thread_pool:: 324   1286 thread_pool::
325   join() noexcept 325   join() noexcept
326   { 326   {
HITCBC 327   1282 impl_->join(); 327   1286 impl_->join();
HITCBC 328   1282 } 328   1286 }
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   14842 thread_pool:: 340   15346 thread_pool::
341   get_executor() const noexcept 341   get_executor() const noexcept
342   { 342   {
HITCBC 343   14842 return executor_type( 343   15346 return executor_type(
HITCBC 344   14842 const_cast<thread_pool&>(*this)); 344   15346 const_cast<thread_pool&>(*this));
345   } 345   }
346   346  
347   void 347   void
HITCBC 348   3583 thread_pool::executor_type:: 348   4087 thread_pool::executor_type::
349   on_work_started() const noexcept 349   on_work_started() const noexcept
350   { 350   {
HITCBC 351   3583 pool_->impl_->on_work_started(); 351   4087 pool_->impl_->on_work_started();
HITCBC 352   3583 } 352   4087 }
353   353  
354   void 354   void
HITCBC 355   3283 thread_pool::executor_type:: 355   3787 thread_pool::executor_type::
356   on_work_finished() const noexcept 356   on_work_finished() const noexcept
357   { 357   {
HITCBC 358   3283 pool_->impl_->on_work_finished(); 358   3787 pool_->impl_->on_work_finished();
HITCBC 359   3283 } 359   3787 }
360   360  
361   void 361   void
HITCBC 362   20650 thread_pool::executor_type:: 362   22236 thread_pool::executor_type::
363   post(continuation& c) const 363   post(continuation& c) const
364   { 364   {
HITCBC 365   20650 pool_->impl_->post(c); 365   22236 pool_->impl_->post(c);
HITCBC 366   20650 } 366   22236 }
367   367  
368   std::coroutine_handle<> 368   std::coroutine_handle<>
HITCBC 369   2706 thread_pool::executor_type:: 369   3210 thread_pool::executor_type::
370   dispatch(continuation& c) const 370   dispatch(continuation& c) const
371   { 371   {
HITCBC 372   2706 if(pool_->impl_->running_in_this_thread()) 372   3210 if(pool_->impl_->running_in_this_thread())
HITCBC 373   7 return c.h; 373   7 return c.h;
HITCBC 374   2699 pool_->impl_->post(c); 374   3203 pool_->impl_->post(c);
HITCBC 375   2699 return std::noop_coroutine(); 375   3203 return std::noop_coroutine();
376   } 376   }
377   377  
378   } // capy 378   } // capy
379   } // boost 379   } // boost