. /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   24179 void push(continuation* c) noexcept 72   24238 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   24179 c->reserved = nullptr; 74   24238 c->reserved = nullptr;
HITCBC 75   24179 if(tail_) 75   24238 if(tail_)
HITCBC 76   1785 tail_->reserved = c; 76   2132 tail_->reserved = c;
77   else 77   else
HITCBC 78   22394 head_ = c; 78   22106 head_ = c;
HITCBC 79   24179 tail_ = c; 79   24238 tail_ = c;
HITCBC 80   24179 } 80   24238 }
81   81  
HITCBC 82   27055 continuation* pop() noexcept 82   27086 continuation* pop() noexcept
83   { 83   {
HITCBC 84   27055 if(!head_) 84   27086 if(!head_)
HITCBC 85   2876 return nullptr; 85   2848 return nullptr;
HITCBC 86   24179 continuation* c = head_; 86   24238 continuation* c = head_;
HITCBC 87   24179 head_ = static_cast<continuation*>(head_->reserved); 87   24238 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   24179 if(!head_) 88   24238 if(!head_)
HITCBC 89   22394 tail_ = nullptr; 89   22106 tail_ = nullptr;
HITCBC 90   24179 return c; 90   24238 return c;
91   } 91   }
92   92  
HITCBC 93   46935 bool empty() const noexcept 93   46795 bool empty() const noexcept
94   { 94   {
HITCBC 95   46935 return head_ == nullptr; 95   46795 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   1438 ~impl() = default; 110   1424 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   3219 running_in_this_thread() const noexcept 113   3205 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   3219 return current_.get() == this; 115   3205 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   2876 drain_abandoned() noexcept 122   2848 drain_abandoned() noexcept
123   { 123   {
124   for(;;) 124   for(;;)
125   { 125   {
126   continuation* c; 126   continuation* c;
127   { 127   {
HITCBC 128   3400 std::lock_guard<std::mutex> lock(mutex_); 128   3417 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 129   3400 c = pop(); 129   3417 c = pop();
HITCBC 130   3400 } 130   3417 }
HITCBC 131   3400 if(!c) 131   3417 if(!c)
HITCBC 132   2876 return; 132   2848 return;
HITCBC 133   524 if(c->h && c->h != std::noop_coroutine()) 133   569 if(c->h && c->h != std::noop_coroutine())
HITCBC 134   271 capy::abandon(*c); 134   316 capy::abandon(*c);
HITCBC 135   524 } 135   569 }
136   } 136   }
137   137  
HITCBC 138   1438 impl(std::size_t num_threads, std::string_view thread_name_prefix) 138   1424 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 139   1438 : num_threads_(num_threads) 139   1424 : num_threads_(num_threads)
140   { 140   {
HITCBC 141   1438 if(num_threads_ == 0) 141   1424 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   1438 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 146   1424 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 147   1438 thread_name_prefix_[n] = '\0'; 147   1424 thread_name_prefix_[n] = '\0';
HITCBC 148   1438 } 148   1424 }
149   149  
150   void 150   void
HITCBC 151   24181 post(continuation& c) 151   24240 post(continuation& c)
152   { 152   {
HITCBC 153   24181 if(!started_.load(std::memory_order_acquire)) 153   24240 if(!started_.load(std::memory_order_acquire))
154   { 154   {
155   { 155   {
HITCBC 156   603 std::lock_guard<std::mutex> lock(mutex_); 156   589 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 157   603 if(stop_) 157   589 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   603 } 164   589 }
HITCBC 165   383 ensure_started(); 165   369 ensure_started();
166   } 166   }
HITCBC 167   23959 std::lock_guard<std::mutex> lock(mutex_); 167   24018 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 168   23959 push(&c); 168   24018 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   23959 work_cv_.notify_one(); 171   24018 work_cv_.notify_one();
HITCBC 172   23959 } 172   24018 }
173   173  
174   void 174   void
HITCBC 175   4096 on_work_started() noexcept 175   4082 on_work_started() noexcept
176   { 176   {
HITCBC 177   4096 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 177   4082 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 178   4096 } 178   4082 }
179   179  
180   void 180   void
HITCBC 181   3796 on_work_finished() noexcept 181   3782 on_work_finished() noexcept
182   { 182   {
HITCBC 183   3796 auto n = outstanding_work_.load(std::memory_order_relaxed); 183   3782 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 184   3803 while(n > 1) 184   3791 while(n > 1)
185   { 185   {
HITCBC 186   1026 if(outstanding_work_.compare_exchange_weak( 186   910 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   506 return; 188   446 return;
189   } 189   }
HITCBC 190   3290 std::lock_guard<std::mutex> lock(mutex_); 190   3336 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 191   3290 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 191   3336 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   3290 if(outstanding_work_.load( 193   3336 if(outstanding_work_.load(
HITCBC 194   3290 std::memory_order_acquire) == 0 && joined_ && !stop_) 194   3336 std::memory_order_acquire) == 0 && joined_ && !stop_)
195   { 195   {
HITCBC 196   701 stop_ = true; 196   709 stop_ = true;
HITCBC 197   701 done_cv_.notify_all(); 197   709 done_cv_.notify_all();
HITCBC 198   701 work_cv_.notify_all(); 198   709 work_cv_.notify_all();
199   } 199   }
HITCBC 200   3290 } 200   3336 }
201   201  
202   void 202   void
HITCBC 203   2733 join() noexcept 203   2705 join() noexcept
204   { 204   {
205   { 205   {
HITCBC 206   2733 std::unique_lock<std::mutex> lock(mutex_); 206   2705 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 207   2733 if(joined_) 207   2705 if(joined_)
HITCBC 208   1295 return; 208   1281 return;
HITCBC 209   1438 joined_ = true; 209   1424 joined_ = true;
210   210  
HITCBC 211   1438 if(outstanding_work_.load( 211   1424 if(outstanding_work_.load(
HITCBC 212   1438 std::memory_order_acquire) == 0) 212   1424 std::memory_order_acquire) == 0)
213   { 213   {
HITCBC 214   381 stop_ = true; 214   359 stop_ = true;
HITCBC 215   381 work_cv_.notify_all(); 215   359 work_cv_.notify_all();
216   } 216   }
217   else 217   else
218   { 218   {
HITCBC 219   1057 done_cv_.wait(lock, [this]{ 219   1065 done_cv_.wait(lock, [this]{
HITCBC 220   2059 return stop_; 220   2075 return stop_;
221   }); 221   });
222   } 222   }
HITCBC 223   2733 } 223   2705 }
224   224  
HITCBC 225   1946 for(auto& t : threads_) 225   1918 for(auto& t : threads_)
HITCBC 226   508 if(t.joinable()) 226   494 if(t.joinable())
HITCBC 227   508 t.join(); 227   494 t.join();
228   } 228   }
229   229  
230   void 230   void
HITCBC 231   1741 stop() noexcept 231   1727 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   1741 std::lock_guard<std::mutex> lock(mutex_); 235   1727 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 236   1741 stop_ = true; 236   1727 stop_ = true;
HITCBC 237   1741 work_cv_.notify_all(); 237   1727 work_cv_.notify_all();
HITCBC 238   1741 done_cv_.notify_all(); 238   1727 done_cv_.notify_all();
HITCBC 239   1741 } 239   1727 }
240   240  
241   private: 241   private:
242   void 242   void
HITCBC 243   383 ensure_started() 243   369 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   383 std::lock_guard<std::mutex> lock(mutex_); 248   369 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 249   383 if(started_.load(std::memory_order_relaxed) || stop_) 249   369 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   383 threads_.reserve(num_threads_); 253   369 threads_.reserve(num_threads_);
HITCBC 254   891 for(std::size_t i = threads_.size(); i < num_threads_; ++i) 254   863 for(std::size_t i = threads_.size(); i < num_threads_; ++i)
HITCBC 255   1018 threads_.emplace_back([this, i]{ run(i); }); 255   990 threads_.emplace_back([this, i]{ run(i); });
HITCBC 256   381 started_.store(true, std::memory_order_release); 256   367 started_.store(true, std::memory_order_release);
HITCBC 257   383 } 257   369 }
258   258  
259   void 259   void
HITCBC 260   508 run(std::size_t index) 260   494 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   508 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 264   494 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 265   508 set_current_thread_name(name); 265   494 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   508 scoped_pool(impl const* p) noexcept { current_.set(p); } 271   494 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 272   508 ~scoped_pool() noexcept { current_.set(nullptr); } 272   494 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 273   508 } guard(this); 273   494 } guard(this);
274   274  
275   for(;;) 275   for(;;)
276   { 276   {
HITCBC 277   24163 continuation* c = nullptr; 277   24163 continuation* c = nullptr;
278   { 278   {
HITCBC 279   24163 std::unique_lock<std::mutex> lock(mutex_); 279   24163 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 280   24163 work_cv_.wait(lock, [this]{ 280   24163 work_cv_.wait(lock, [this]{
HITCBC 281   70119 return !empty() || 281   69820 return !empty() ||
HITCBC 282   70119 stop_; 282   69820 stop_;
283   }); 283   });
HITCBC 284   24163 if(stop_) 284   24163 if(stop_)
HITCBC 285   1016 return; 285   988 return;
HITCBC 286   23655 c = pop(); 286   23669 c = pop();
HITCBC 287   24163 } 287   24163 }
HITCBC 288   23655 if(c) 288   23669 if(c)
HITCBC 289   23655 safe_resume(c->h); 289   23669 safe_resume(c->h);
HITCBC 290   23655 } 290   23669 }
HITCBC 291   508 } 291   494 }
292   }; 292   };
293   293  
294   //------------------------------------------------------------------------------ 294   //------------------------------------------------------------------------------
295   295  
HITCBC 296   1438 thread_pool:: 296   1424 thread_pool::
297   ~thread_pool() 297   ~thread_pool()
298   { 298   {
HITCBC 299   1438 impl_->stop(); 299   1424 impl_->stop();
HITCBC 300   1438 impl_->join(); 300   1424 impl_->join();
HITCBC 301   1438 shutdown(); 301   1424 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   1438 impl_->drain_abandoned(); 304   1424 impl_->drain_abandoned();
HITCBC 305   1438 destroy(); 305   1424 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   1438 impl_->drain_abandoned(); 308   1424 impl_->drain_abandoned();
HITCBC 309   1438 delete impl_; 309   1424 delete impl_;
HITCBC 310   1438 } 310   1424 }
311   311  
HITCBC 312   1438 thread_pool:: 312   1424 thread_pool::
HITCBC 313   1438 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 313   1424 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 314   1438 : impl_(new impl(num_threads, thread_name_prefix)) 314   1424 : impl_(new impl(num_threads, thread_name_prefix))
315   { 315   {
HITCBC 316   1438 this->set_frame_allocator(std::allocator<void>{}); 316   1424 this->set_frame_allocator(std::allocator<void>{});
HITCBC 317   1438 } 317   1424 }
318   318  
319   void 319   void
HITCBC 320   1295 thread_pool:: 320   1281 thread_pool::
321   join() noexcept 321   join() noexcept
322   { 322   {
HITCBC 323   1295 impl_->join(); 323   1281 impl_->join();
HITCBC 324   1295 } 324   1281 }
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   15357 thread_pool:: 336   15343 thread_pool::
337   get_executor() const noexcept 337   get_executor() const noexcept
338   { 338   {
HITCBC 339   15357 return executor_type( 339   15343 return executor_type(
HITCBC 340   15357 const_cast<thread_pool&>(*this)); 340   15343 const_cast<thread_pool&>(*this));
341   } 341   }
342   342  
343   void 343   void
HITCBC 344   4096 thread_pool::executor_type:: 344   4082 thread_pool::executor_type::
345   on_work_started() const noexcept 345   on_work_started() const noexcept
346   { 346   {
HITCBC 347   4096 pool_->impl_->on_work_started(); 347   4082 pool_->impl_->on_work_started();
HITCBC 348   4096 } 348   4082 }
349   349  
350   void 350   void
HITCBC 351   3796 thread_pool::executor_type:: 351   3782 thread_pool::executor_type::
352   on_work_finished() const noexcept 352   on_work_finished() const noexcept
353   { 353   {
HITCBC 354   3796 pool_->impl_->on_work_finished(); 354   3782 pool_->impl_->on_work_finished();
HITCBC 355   3796 } 355   3782 }
356   356  
357   void 357   void
HITCBC 358   20969 thread_pool::executor_type:: 358   21042 thread_pool::executor_type::
359   post(continuation& c) const 359   post(continuation& c) const
360   { 360   {
HITCBC 361   20969 pool_->impl_->post(c); 361   21042 pool_->impl_->post(c);
HITCBC 362   20967 } 362   21040 }
363   363  
364   std::coroutine_handle<> 364   std::coroutine_handle<>
HITCBC 365   3219 thread_pool::executor_type:: 365   3205 thread_pool::executor_type::
366   dispatch(continuation& c) const 366   dispatch(continuation& c) const
367   { 367   {
HITCBC 368   3219 if(pool_->impl_->running_in_this_thread()) 368   3205 if(pool_->impl_->running_in_this_thread())
HITCBC 369   7 return c.h; 369   7 return c.h;
HITCBC 370   3212 pool_->impl_->post(c); 370   3198 pool_->impl_->post(c);
HITCBC 371   3212 return std::noop_coroutine(); 371   3198 return std::noop_coroutine();
372   } 372   }
373   373  
374   } // capy 374   } // capy
375   } // boost 375   } // boost