. /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   22416 void push(continuation* c) noexcept 72   23688 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   22416 c->reserved = nullptr; 74   23688 c->reserved = nullptr;
HITCBC 75   22416 if(tail_) 75   23688 if(tail_)
HITCBC 76   3117 tail_->reserved = c; 76   4868 tail_->reserved = c;
77   else 77   else
HITCBC 78   19299 head_ = c; 78   18820 head_ = c;
HITCBC 79   22416 tail_ = c; 79   23688 tail_ = c;
HITCBC 80   22416 } 80   23688 }
81   81  
HITCBC 82   25260 continuation* pop() noexcept 82   26530 continuation* pop() noexcept
83   { 83   {
HITCBC 84   25260 if(!head_) 84   26530 if(!head_)
HITCBC 85   2844 return nullptr; 85   2842 return nullptr;
HITCBC 86   22416 continuation* c = head_; 86   23688 continuation* c = head_;
HITCBC 87   22416 head_ = static_cast<continuation*>(head_->reserved); 87   23688 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   22416 if(!head_) 88   23688 if(!head_)
HITCBC 89   19299 tail_ = nullptr; 89   18820 tail_ = nullptr;
HITCBC 90   22416 return c; 90   23688 return c;
91   } 91   }
92   92  
HITCBC 93   41540 bool empty() const noexcept 93   42169 bool empty() const noexcept
94   { 94   {
HITCBC 95   41540 return head_ == nullptr; 95   42169 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   1422 ~impl() = default; 110   1421 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   3200 running_in_this_thread() const noexcept 113   3199 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   3200 return current_.get() == this; 115   3199 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   2844 drain_abandoned() noexcept 122   2842 drain_abandoned() noexcept
123   { 123   {
124   for(;;) 124   for(;;)
125   { 125   {
126   continuation* c; 126   continuation* c;
127   { 127   {
HITCBC 128   3379 std::lock_guard<std::mutex> lock(mutex_); 128   3385 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 129   3379 c = pop(); 129   3385 c = pop();
HITCBC 130   3379 } 130   3385 }
HITCBC 131   3379 if(!c) 131   3385 if(!c)
HITCBC 132   2844 return; 132   2842 return;
HITCBC 133   535 if(c->h && c->h != std::noop_coroutine()) 133   543 if(c->h && c->h != std::noop_coroutine())
HITCBC 134   282 capy::abandon(*c); 134   290 capy::abandon(*c);
HITCBC 135   535 } 135   543 }
136   } 136   }
137   137  
HITCBC 138   1422 impl(std::size_t num_threads, std::string_view thread_name_prefix) 138   1421 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 139   1422 : num_threads_(num_threads) 139   1421 : num_threads_(num_threads)
140   { 140   {
HITCBC 141   1422 if(num_threads_ == 0) 141   1421 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   1422 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 146   1421 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 147   1422 thread_name_prefix_[n] = '\0'; 147   1421 thread_name_prefix_[n] = '\0';
HITCBC 148   1422 } 148   1421 }
149   149  
150   void 150   void
HITCBC 151   22418 post(continuation& c) 151   23690 post(continuation& c)
152   { 152   {
HITCBC 153   22418 if(!started_.load(std::memory_order_acquire)) 153   23690 if(!started_.load(std::memory_order_acquire))
154   { 154   {
155   { 155   {
HITCBC 156   587 std::lock_guard<std::mutex> lock(mutex_); 156   586 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 157   587 if(stop_) 157   586 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   587 } 164   586 }
HITCBC 165   367 ensure_started(); 165   366 ensure_started();
166   } 166   }
HITCBC 167   22196 std::lock_guard<std::mutex> lock(mutex_); 167   23468 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 168   22196 push(&c); 168   23468 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   22196 work_cv_.notify_one(); 171   23468 work_cv_.notify_one();
HITCBC 172   22196 } 172   23468 }
173   173  
174   void 174   void
HITCBC 175   4080 on_work_started() noexcept 175   4079 on_work_started() noexcept
176   { 176   {
HITCBC 177   4080 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 177   4079 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 178   4080 } 178   4079 }
179   179  
180   void 180   void
HITCBC 181   3780 on_work_finished() noexcept 181   3779 on_work_finished() noexcept
182   { 182   {
HITCBC 183   3780 auto n = outstanding_work_.load(std::memory_order_relaxed); 183   3779 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 184   3782 while(n > 1) 184   3787 while(n > 1)
185   { 185   {
HITCBC 186   1144 if(outstanding_work_.compare_exchange_weak( 186   908 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   570 return; 188   446 return;
189   } 189   }
HITCBC 190   3210 std::lock_guard<std::mutex> lock(mutex_); 190   3333 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 191   3210 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 191   3333 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   3210 if(outstanding_work_.load( 193   3333 if(outstanding_work_.load(
HITCBC 194   3210 std::memory_order_acquire) == 0 && joined_ && !stop_) 194   3333 std::memory_order_acquire) == 0 && joined_ && !stop_)
195   { 195   {
HITCBC 196   691 stop_ = true; 196   708 stop_ = true;
HITCBC 197   691 done_cv_.notify_all(); 197   708 done_cv_.notify_all();
HITCBC 198   691 work_cv_.notify_all(); 198   708 work_cv_.notify_all();
199   } 199   }
HITCBC 200   3210 } 200   3333 }
201   201  
202   void 202   void
HITCBC 203   2705 join() noexcept 203   2703 join() noexcept
204   { 204   {
205   { 205   {
HITCBC 206   2705 std::unique_lock<std::mutex> lock(mutex_); 206   2703 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 207   2705 if(joined_) 207   2703 if(joined_)
HITCBC 208   1283 return; 208   1282 return;
HITCBC 209   1422 joined_ = true; 209   1421 joined_ = true;
210   210  
HITCBC 211   1422 if(outstanding_work_.load( 211   1421 if(outstanding_work_.load(
HITCBC 212   1422 std::memory_order_acquire) == 0) 212   1421 std::memory_order_acquire) == 0)
213   { 213   {
HITCBC 214   375 stop_ = true; 214   359 stop_ = true;
HITCBC 215   375 work_cv_.notify_all(); 215   359 work_cv_.notify_all();
216   } 216   }
217   else 217   else
218   { 218   {
HITCBC 219   1047 done_cv_.wait(lock, [this]{ 219   1062 done_cv_.wait(lock, [this]{
HITCBC 220   2039 return stop_; 220   2071 return stop_;
221   }); 221   });
222   } 222   }
HITCBC 223   2705 } 223   2703 }
224   224  
HITCBC 225   1911 for(auto& t : threads_) 225   1909 for(auto& t : threads_)
HITCBC 226   489 if(t.joinable()) 226   488 if(t.joinable())
HITCBC 227   489 t.join(); 227   488 t.join();
228   } 228   }
229   229  
230   void 230   void
HITCBC 231   1725 stop() noexcept 231   1724 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   1725 std::lock_guard<std::mutex> lock(mutex_); 235   1724 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 236   1725 stop_ = true; 236   1724 stop_ = true;
HITCBC 237   1725 work_cv_.notify_all(); 237   1724 work_cv_.notify_all();
HITCBC 238   1725 done_cv_.notify_all(); 238   1724 done_cv_.notify_all();
HITCBC 239   1725 } 239   1724 }
240   240  
241   private: 241   private:
242   void 242   void
HITCBC 243   367 ensure_started() 243   366 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   367 std::lock_guard<std::mutex> lock(mutex_); 248   366 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 249   367 if(started_.load(std::memory_order_relaxed) || stop_) 249   366 if(started_.load(std::memory_order_relaxed) || stop_)
MISUBC 250   ✗ return; 250   ✗ 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   367 threads_.reserve(num_threads_); 253   366 threads_.reserve(num_threads_);
HITCBC 254   856 for(std::size_t i = threads_.size(); i < num_threads_; ++i) 254   854 for(std::size_t i = threads_.size(); i < num_threads_; ++i)
HITCBC 255   980 threads_.emplace_back([this, i]{ run(i); }); 255   978 threads_.emplace_back([this, i]{ run(i); });
HITCBC 256   365 started_.store(true, std::memory_order_release); 256   364 started_.store(true, std::memory_order_release);
HITCBC 257   367 } 257   366 }
258   258  
259   void 259   void
HITCBC 260   489 run(std::size_t index) 260   488 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   489 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 264   488 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 265   489 set_current_thread_name(name); 265   488 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   489 scoped_pool(impl const* p) noexcept { current_.set(p); } 271   488 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 272   489 ~scoped_pool() noexcept { current_.set(nullptr); } 272   488 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 273   489 } guard(this); 273   488 } guard(this);
274   274  
275   for(;;) 275   for(;;)
276   { 276   {
HITCBC 277   22370 continuation* c = nullptr; 277   23633 continuation* c = nullptr;
278   { 278   {
HITCBC 279   22370 std::unique_lock<std::mutex> lock(mutex_); 279   23633 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 280   22370 work_cv_.wait(lock, [this]{ 280   23633 work_cv_.wait(lock, [this]{
HITCBC 281   61100 return !empty() || 281   61092 return !empty() ||
HITCBC 282   61100 stop_; 282   61092 stop_;
283   }); 283   });
HITCBC 284   22370 if(stop_) 284   23633 if(stop_)
HITCBC 285   978 return; 285   976 return;
HITCBC 286   21881 c = pop(); 286   23145 c = pop();
HITCBC 287   22370 } 287   23633 }
HITCBC 288   21881 if(c) 288   23145 if(c)
HITCBC 289   21881 safe_resume(c->h); 289   23145 safe_resume(c->h);
HITCBC 290   21881 } 290   23145 }
HITCBC 291   489 } 291   488 }
292   }; 292   };
293   293  
294   //------------------------------------------------------------------------------ 294   //------------------------------------------------------------------------------
295   295  
HITCBC 296   1422 thread_pool:: 296   1421 thread_pool::
297   ~thread_pool() 297   ~thread_pool()
298   { 298   {
HITCBC 299   1422 impl_->stop(); 299   1421 impl_->stop();
HITCBC 300   1422 impl_->join(); 300   1421 impl_->join();
HITCBC 301   1422 shutdown(); 301   1421 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   1422 impl_->drain_abandoned(); 304   1421 impl_->drain_abandoned();
HITCBC 305   1422 destroy(); 305   1421 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   1422 impl_->drain_abandoned(); 308   1421 impl_->drain_abandoned();
HITCBC 309   1422 delete impl_; 309   1421 delete impl_;
HITCBC 310   1422 } 310   1421 }
311   311  
HITCBC 312   1422 thread_pool:: 312   1421 thread_pool::
HITCBC 313   1422 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 313   1421 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 314   1422 : impl_(new impl(num_threads, thread_name_prefix)) 314   1421 : impl_(new impl(num_threads, thread_name_prefix))
315   { 315   {
HITCBC 316   1422 this->set_frame_allocator(std::allocator<void>{}); 316   1421 this->set_frame_allocator(std::allocator<void>{});
HITCBC 317   1422 } 317   1421 }
318   318  
319   void 319   void
HITCBC 320   1283 thread_pool:: 320   1282 thread_pool::
321   join() noexcept 321   join() noexcept
322   { 322   {
HITCBC 323   1283 impl_->join(); 323   1282 impl_->join();
HITCBC 324   1283 } 324   1282 }
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   15341 thread_pool:: 336   15340 thread_pool::
337   get_executor() const noexcept 337   get_executor() const noexcept
338   { 338   {
HITCBC 339   15341 return executor_type( 339   15340 return executor_type(
HITCBC 340   15341 const_cast<thread_pool&>(*this)); 340   15340 const_cast<thread_pool&>(*this));
341   } 341   }
342   342  
343   void 343   void
HITCBC 344   4080 thread_pool::executor_type:: 344   4079 thread_pool::executor_type::
345   on_work_started() const noexcept 345   on_work_started() const noexcept
346   { 346   {
HITCBC 347   4080 pool_->impl_->on_work_started(); 347   4079 pool_->impl_->on_work_started();
HITCBC 348   4080 } 348   4079 }
349   349  
350   void 350   void
HITCBC 351   3780 thread_pool::executor_type:: 351   3779 thread_pool::executor_type::
352   on_work_finished() const noexcept 352   on_work_finished() const noexcept
353   { 353   {
HITCBC 354   3780 pool_->impl_->on_work_finished(); 354   3779 pool_->impl_->on_work_finished();
HITCBC 355   3780 } 355   3779 }
356   356  
357   void 357   void
HITCBC 358   19222 thread_pool::executor_type:: 358   20495 thread_pool::executor_type::
359   post(continuation& c) const 359   post(continuation& c) const
360   { 360   {
HITCBC 361   19222 pool_->impl_->post(c); 361   20495 pool_->impl_->post(c);
HITCBC 362   19220 } 362   20493 }
363   363  
364   std::coroutine_handle<> 364   std::coroutine_handle<>
HITCBC 365   3200 thread_pool::executor_type:: 365   3199 thread_pool::executor_type::
366   dispatch(continuation& c) const 366   dispatch(continuation& c) const
367   { 367   {
HITCBC 368   3200 if(pool_->impl_->running_in_this_thread()) 368   3199 if(pool_->impl_->running_in_this_thread())
HITCBC 369   4 return c.h; 369   4 return c.h;
HITCBC 370   3196 pool_->impl_->post(c); 370   3195 pool_->impl_->post(c);
HITCBC 371   3196 return std::noop_coroutine(); 371   3195 return std::noop_coroutine();
372   } 372   }
373   373  
374   } // capy 374   } // capy
375   } // boost 375   } // boost