. /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   22659 void push(continuation* c) noexcept 72   24089 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   22659 c->reserved = nullptr; 74   24089 c->reserved = nullptr;
HITCBC 75   22659 if(tail_) 75   24089 if(tail_)
HITCBC 76   1474 tail_->reserved = c; 76   3344 tail_->reserved = c;
77   else 77   else
HITCBC 78   21185 head_ = c; 78   20745 head_ = c;
HITCBC 79   22659 tail_ = c; 79   24089 tail_ = c;
HITCBC 80   22659 } 80   24089 }
81   81  
HITCBC 82   25527 continuation* pop() noexcept 82   26955 continuation* pop() noexcept
83   { 83   {
HITCBC 84   25527 if(!head_) 84   26955 if(!head_)
HITCBC 85   2868 return nullptr; 85   2866 return nullptr;
HITCBC 86   22659 continuation* c = head_; 86   24089 continuation* c = head_;
HITCBC 87   22659 head_ = static_cast<continuation*>(head_->reserved); 87   24089 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   22659 if(!head_) 88   24089 if(!head_)
HITCBC 89   21185 tail_ = nullptr; 89   20745 tail_ = nullptr;
HITCBC 90   22659 return c; 90   24089 return c;
91   } 91   }
92   92  
HITCBC 93   43868 bool empty() const noexcept 93   44736 bool empty() const noexcept
94   { 94   {
HITCBC 95   43868 return head_ == nullptr; 95   44736 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   1434 ~impl() = default; 110   1433 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   3212 running_in_this_thread() const noexcept 113   3211 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   3212 return current_.get() == this; 115   3211 return current_.get() == this;
116   } 116   }
117   117  
118   // Abandon queued coroutines. Each is taken under the lock, as other 118   // Abandon queued coroutines. Each is taken under the lock, as other
119   // threads may still post, and abandoned outside it, as abandoning 119   // threads may still post, and abandoned outside it, as abandoning
120   // can post. 120   // can post.
121   void 121   void
HITCBC 122   2868 drain_abandoned() noexcept 122   2866 drain_abandoned() noexcept
123   { 123   {
124   for(;;) 124   for(;;)
125   { 125   {
126   continuation* c; 126   continuation* c;
127   { 127   {
HITCBC 128   3377 std::lock_guard<std::mutex> lock(mutex_); 128   3415 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 129   3377 c = pop(); 129   3415 c = pop();
HITCBC 130   3377 } 130   3415 }
HITCBC 131   3377 if(!c) 131   3415 if(!c)
HITCBC 132   2868 return; 132   2866 return;
HITCBC 133   509 if(c->h && c->h != std::noop_coroutine()) 133   549 if(c->h && c->h != std::noop_coroutine())
HITCBC 134   256 capy::abandon(*c); 134   296 capy::abandon(*c);
HITCBC 135   509 } 135   549 }
136   } 136   }
137   137  
HITCBC 138   1434 impl(std::size_t num_threads, std::string_view thread_name_prefix) 138   1433 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 139   1434 : num_threads_(num_threads) 139   1433 : num_threads_(num_threads)
140   { 140   {
HITCBC 141   1434 if(num_threads_ == 0) 141   1433 if(num_threads_ == 0)
HITCBC 142   8 num_threads_ = std::max( 142   8 num_threads_ = std::max(
HITCBC 143   4 std::thread::hardware_concurrency(), 1u); 143   4 std::thread::hardware_concurrency(), 1u);
144   144  
145   // Truncate prefix to 12 chars, leaving room for up to 3-digit index. 145   // Truncate prefix to 12 chars, leaving room for up to 3-digit index.
HITCBC 146   1434 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 146   1433 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 147   1434 thread_name_prefix_[n] = '\0'; 147   1433 thread_name_prefix_[n] = '\0';
HITCBC 148   1434 } 148   1433 }
149   149  
150   void 150   void
HITCBC 151   22661 post(continuation& c) 151   24091 post(continuation& c)
152   { 152   {
HITCBC 153   22661 if(!started_.load(std::memory_order_acquire)) 153   24091 if(!started_.load(std::memory_order_acquire))
154   { 154   {
155   { 155   {
HITCBC 156   600 std::lock_guard<std::mutex> lock(mutex_); 156   600 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 157   600 if(stop_) 157   600 if(stop_)
158   { 158   {
159   // Stopped before any thread started: nothing will 159   // Stopped before any thread started: nothing will
160   // run it, and the destructor's drain abandons it. 160   // run it, and the destructor's drain abandons it.
HITCBC 161   220 push(&c); 161   220 push(&c);
HITCBC 162   220 return; 162   220 return;
163   } 163   }
HITCBC 164   600 } 164   600 }
HITCBC 165   380 ensure_started(); 165   380 ensure_started();
166   } 166   }
HITCBC 167   22439 std::lock_guard<std::mutex> lock(mutex_); 167   23869 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 168   22439 push(&c); 168   23869 push(&c);
169   // Under the lock so the pool cannot drain, join, and 169   // Under the lock so the pool cannot drain, join, and
170   // destroy the condition variable mid-signal. 170   // destroy the condition variable mid-signal.
HITCBC 171   22439 work_cv_.notify_one(); 171   23869 work_cv_.notify_one();
HITCBC 172   22439 } 172   23869 }
173   173  
174   void 174   void
HITCBC 175   4092 on_work_started() noexcept 175   4091 on_work_started() noexcept
176   { 176   {
HITCBC 177   4092 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 177   4091 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 178   4092 } 178   4091 }
179   179  
180   void 180   void
HITCBC 181   3792 on_work_finished() noexcept 181   3791 on_work_finished() noexcept
182   { 182   {
HITCBC 183   3792 auto n = outstanding_work_.load(std::memory_order_relaxed); 183   3791 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 184   3799 while(n > 1) 184   3797 while(n > 1)
185   { 185   {
HITCBC 186   2710 if(outstanding_work_.compare_exchange_weak( 186   904 if(outstanding_work_.compare_exchange_weak(
187   n, n - 1, std::memory_order_acq_rel)) 187   n, n - 1, std::memory_order_acq_rel))
HITCBC 188   1348 return; 188   446 return;
189   } 189   }
HITCBC 190   2444 std::lock_guard<std::mutex> lock(mutex_); 190   3345 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 191   2444 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 191   3345 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel);
192   // Re-read: a concurrent on_work_started() may have raised it. 192   // Re-read: a concurrent on_work_started() may have raised it.
HITCBC 193   2444 if(outstanding_work_.load( 193   3345 if(outstanding_work_.load(
HITCBC 194   2444 std::memory_order_acquire) == 0 && joined_ && !stop_) 194   3345 std::memory_order_acquire) == 0 && joined_ && !stop_)
195   { 195   {
HITCBC 196   698 stop_ = true; 196   700 stop_ = true;
HITCBC 197   698 done_cv_.notify_all(); 197   700 done_cv_.notify_all();
HITCBC 198   698 work_cv_.notify_all(); 198   700 work_cv_.notify_all();
199   } 199   }
HITCBC 200   2444 } 200   3345 }
201   201  
202   void 202   void
HITCBC 203   2729 join() noexcept 203   2727 join() noexcept
204   { 204   {
205   { 205   {
HITCBC 206   2729 std::unique_lock<std::mutex> lock(mutex_); 206   2727 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 207   2729 if(joined_) 207   2727 if(joined_)
HITCBC 208   1295 return; 208   1294 return;
HITCBC 209   1434 joined_ = true; 209   1433 joined_ = true;
210   210  
HITCBC 211   1434 if(outstanding_work_.load( 211   1433 if(outstanding_work_.load(
HITCBC 212   1434 std::memory_order_acquire) == 0) 212   1433 std::memory_order_acquire) == 0)
213   { 213   {
HITCBC 214   382 stop_ = true; 214   379 stop_ = true;
HITCBC 215   382 work_cv_.notify_all(); 215   379 work_cv_.notify_all();
216   } 216   }
217   else 217   else
218   { 218   {
HITCBC 219   1052 done_cv_.wait(lock, [this]{ 219   1054 done_cv_.wait(lock, [this]{
HITCBC 220   2051 return stop_; 220   2055 return stop_;
221   }); 221   });
222   } 222   }
HITCBC 223   2729 } 223   2727 }
224   224  
HITCBC 225   1935 for(auto& t : threads_) 225   1933 for(auto& t : threads_)
HITCBC 226   501 if(t.joinable()) 226   500 if(t.joinable())
HITCBC 227   501 t.join(); 227   500 t.join();
228   } 228   }
229   229  
230   void 230   void
HITCBC 231   1737 stop() noexcept 231   1736 stop() noexcept
232   { 232   {
233   // Under the lock: the join() this releases may return and let 233   // Under the lock: the join() this releases may return and let
234   // the pool be destroyed as soon as the lock is free. 234   // the pool be destroyed as soon as the lock is free.
HITCBC 235   1737 std::lock_guard<std::mutex> lock(mutex_); 235   1736 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 236   1737 stop_ = true; 236   1736 stop_ = true;
HITCBC 237   1737 work_cv_.notify_all(); 237   1736 work_cv_.notify_all();
HITCBC 238   1737 done_cv_.notify_all(); 238   1736 done_cv_.notify_all();
HITCBC 239   1737 } 239   1736 }
240   240  
241   private: 241   private:
242   void 242   void
HITCBC 243   380 ensure_started() 243   380 ensure_started()
244   { 244   {
245   // Under the lock, so join() either sees every thread started 245   // Under the lock, so join() either sees every thread started
246   // here or makes this start none. A joined pool still starts them: 246   // here or makes this start none. A joined pool still starts them:
247   // join() may be waiting on work that needs them. 247   // join() may be waiting on work that needs them.
HITCBC 248   380 std::lock_guard<std::mutex> lock(mutex_); 248   380 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 249   380 if(started_.load(std::memory_order_relaxed) || stop_) 249   380 if(started_.load(std::memory_order_relaxed) || stop_)
HITCBC 250   1 return; 250   2 return;
251   // Start at the threads already running: if an earlier call 251   // Start at the threads already running: if an earlier call
252   // threw partway, this one adds only the missing ones. 252   // threw partway, this one adds only the missing ones.
HITCBC 253   379 threads_.reserve(num_threads_); 253   378 threads_.reserve(num_threads_);
HITCBC 254   880 for(std::size_t i = threads_.size(); i < num_threads_; ++i) 254   878 for(std::size_t i = threads_.size(); i < num_threads_; ++i)
HITCBC 255   1004 threads_.emplace_back([this, i]{ run(i); }); 255   1002 threads_.emplace_back([this, i]{ run(i); });
HITCBC 256   377 started_.store(true, std::memory_order_release); 256   376 started_.store(true, std::memory_order_release);
HITCBC 257   380 } 257   380 }
258   258  
259   void 259   void
HITCBC 260   501 run(std::size_t index) 260   500 run(std::size_t index)
261   { 261   {
262   // Build name; set_current_thread_name truncates to platform limits. 262   // Build name; set_current_thread_name truncates to platform limits.
263   char name[16]; 263   char name[16];
HITCBC 264   501 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 264   500 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 265   501 set_current_thread_name(name); 265   500 set_current_thread_name(name);
266   266  
267   // Mark this thread as a worker of this pool so dispatch() 267   // Mark this thread as a worker of this pool so dispatch()
268   // can symmetric-transfer when called from within pool work. 268   // can symmetric-transfer when called from within pool work.
269   struct scoped_pool 269   struct scoped_pool
270   { 270   {
HITCBC 271   501 scoped_pool(impl const* p) noexcept { current_.set(p); } 271   500 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 272   501 ~scoped_pool() noexcept { current_.set(nullptr); } 272   500 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 273   501 } guard(this); 273   500 } guard(this);
274   274  
275   for(;;) 275   for(;;)
276   { 276   {
HITCBC 277   22651 continuation* c = nullptr; 277   24040 continuation* c = nullptr;
278   { 278   {
HITCBC 279   22651 std::unique_lock<std::mutex> lock(mutex_); 279   24040 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 280   22651 work_cv_.wait(lock, [this]{ 280   24040 work_cv_.wait(lock, [this]{
HITCBC 281   65495 return !empty() || 281   65839 return !empty() ||
HITCBC 282   65495 stop_; 282   65839 stop_;
283   }); 283   });
HITCBC 284   22651 if(stop_) 284   24040 if(stop_)
HITCBC 285   1002 return; 285   1000 return;
HITCBC 286   22150 c = pop(); 286   23540 c = pop();
HITCBC 287   22651 } 287   24040 }
HITCBC 288   22150 if(c) 288   23540 if(c)
HITCBC 289   22150 safe_resume(c->h); 289   23540 safe_resume(c->h);
HITCBC 290   22150 } 290   23540 }
HITCBC 291   501 } 291   500 }
292   }; 292   };
293   293  
294   //------------------------------------------------------------------------------ 294   //------------------------------------------------------------------------------
295   295  
HITCBC 296   1434 thread_pool:: 296   1433 thread_pool::
297   ~thread_pool() 297   ~thread_pool()
298   { 298   {
HITCBC 299   1434 impl_->stop(); 299   1433 impl_->stop();
HITCBC 300   1434 impl_->join(); 300   1433 impl_->join();
HITCBC 301   1434 shutdown(); 301   1433 shutdown();
302   // Takes what the unwinds post too, and the work of any service they 302   // Takes what the unwinds post too, and the work of any service they
303   // create, which is shut down as it is created. 303   // create, which is shut down as it is created.
HITCBC 304   1434 impl_->drain_abandoned(); 304   1433 impl_->drain_abandoned();
HITCBC 305   1434 destroy(); 305   1433 destroy();
306   // Services give up their work in shutdown(), but anything a 306   // Services give up their work in shutdown(), but anything a
307   // destructor posts anyway is still destroyed. 307   // destructor posts anyway is still destroyed.
HITCBC 308   1434 impl_->drain_abandoned(); 308   1433 impl_->drain_abandoned();
HITCBC 309   1434 delete impl_; 309   1433 delete impl_;
HITCBC 310   1434 } 310   1433 }
311   311  
HITCBC 312   1434 thread_pool:: 312   1433 thread_pool::
HITCBC 313   1434 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 313   1433 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 314   1434 : impl_(new impl(num_threads, thread_name_prefix)) 314   1433 : impl_(new impl(num_threads, thread_name_prefix))
315   { 315   {
HITCBC 316   1434 this->set_frame_allocator(std::allocator<void>{}); 316   1433 this->set_frame_allocator(std::allocator<void>{});
HITCBC 317   1434 } 317   1433 }
318   318  
319   void 319   void
HITCBC 320   1295 thread_pool:: 320   1294 thread_pool::
321   join() noexcept 321   join() noexcept
322   { 322   {
HITCBC 323   1295 impl_->join(); 323   1294 impl_->join();
HITCBC 324   1295 } 324   1294 }
325   325  
326   void 326   void
HITCBC 327   303 thread_pool:: 327   303 thread_pool::
328   stop() noexcept 328   stop() noexcept
329   { 329   {
HITCBC 330   303 impl_->stop(); 330   303 impl_->stop();
HITCBC 331   303 } 331   303 }
332   332  
333   //------------------------------------------------------------------------------ 333   //------------------------------------------------------------------------------
334   334  
335   thread_pool::executor_type 335   thread_pool::executor_type
HITCBC 336   15353 thread_pool:: 336   15352 thread_pool::
337   get_executor() const noexcept 337   get_executor() const noexcept
338   { 338   {
HITCBC 339   15353 return executor_type( 339   15352 return executor_type(
HITCBC 340   15353 const_cast<thread_pool&>(*this)); 340   15352 const_cast<thread_pool&>(*this));
341   } 341   }
342   342  
343   void 343   void
HITCBC 344   4092 thread_pool::executor_type:: 344   4091 thread_pool::executor_type::
345   on_work_started() const noexcept 345   on_work_started() const noexcept
346   { 346   {
HITCBC 347   4092 pool_->impl_->on_work_started(); 347   4091 pool_->impl_->on_work_started();
HITCBC 348   4092 } 348   4091 }
349   349  
350   void 350   void
HITCBC 351   3792 thread_pool::executor_type:: 351   3791 thread_pool::executor_type::
352   on_work_finished() const noexcept 352   on_work_finished() const noexcept
353   { 353   {
HITCBC 354   3792 pool_->impl_->on_work_finished(); 354   3791 pool_->impl_->on_work_finished();
HITCBC 355   3792 } 355   3791 }
356   356  
357   void 357   void
HITCBC 358   19453 thread_pool::executor_type:: 358   20884 thread_pool::executor_type::
359   post(continuation& c) const 359   post(continuation& c) const
360   { 360   {
HITCBC 361   19453 pool_->impl_->post(c); 361   20884 pool_->impl_->post(c);
HITCBC 362   19451 } 362   20882 }
363   363  
364   std::coroutine_handle<> 364   std::coroutine_handle<>
HITCBC 365   3212 thread_pool::executor_type:: 365   3211 thread_pool::executor_type::
366   dispatch(continuation& c) const 366   dispatch(continuation& c) const
367   { 367   {
HITCBC 368   3212 if(pool_->impl_->running_in_this_thread()) 368   3211 if(pool_->impl_->running_in_this_thread())
HITCBC 369   4 return c.h; 369   4 return c.h;
HITCBC 370   3208 pool_->impl_->post(c); 370   3207 pool_->impl_->post(c);
HITCBC 371   3208 return std::noop_coroutine(); 371   3207 return std::noop_coroutine();
372   } 372   }
373   373  
374   } // capy 374   } // capy
375   } // boost 375   } // boost