. /src /ex /thread_pool.cpp
100.00% Lines (151/151) 100.00% Functions (28/28)
[ ] prev/next file n p prev/next uncovered line
TLA Baseline Branch
Line Hits Code Line Hits Code
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   24727 void push(continuation* c) noexcept 72   22862 void push(continuation* c) noexcept
73   { 73   {
HITCBC 74   24727 c->reserved = nullptr; 74   22862 c->reserved = nullptr;
HITCBC 75   24727 if(tail_) 75   22862 if(tail_)
HITCBC 76   5639 tail_->reserved = c; 76   1374 tail_->reserved = c;
77   else 77   else
HITCBC 78   19088 head_ = c; 78   21488 head_ = c;
HITCBC 79   24727 tail_ = c; 79   22862 tail_ = c;
HITCBC 80   24727 } 80   22862 }
81   81  
HITCBC 82   27579 continuation* pop() noexcept 82   25706 continuation* pop() noexcept
83   { 83   {
HITCBC 84   27579 if(!head_) 84   25706 if(!head_)
HITCBC 85   2852 return nullptr; 85   2844 return nullptr;
HITCBC 86   24727 continuation* c = head_; 86   22862 continuation* c = head_;
HITCBC 87   24727 head_ = static_cast<continuation*>(head_->reserved); 87   22862 head_ = static_cast<continuation*>(head_->reserved);
HITCBC 88   24727 if(!head_) 88   22862 if(!head_)
HITCBC 89   19088 tail_ = nullptr; 89   21488 tail_ = nullptr;
HITCBC 90   24727 return c; 90   22862 return c;
91   } 91   }
92   92  
HITCBC 93   43705 bool empty() const noexcept 93   44263 bool empty() const noexcept
94   { 94   {
HITCBC 95   43705 return head_ == nullptr; 95   44263 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   1426 ~impl() = default; 110   1422 ~impl() = default;
111   111  
112   bool 112   bool
HITCBC 113   3204 running_in_this_thread() const noexcept 113   3200 running_in_this_thread() const noexcept
114   { 114   {
HITCBC 115   3204 return current_.get() == this; 115   3200 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   2852 drain_abandoned() noexcept 122   2844 drain_abandoned() noexcept
123   { 123   {
124   for(;;) 124   for(;;)
125   { 125   {
126   continuation* c; 126   continuation* c;
127   { 127   {
HITCBC 128   3415 std::lock_guard<std::mutex> lock(mutex_); 128   3387 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 129   3415 c = pop(); 129   3387 c = pop();
HITCBC 130   3415 } 130   3387 }
HITCBC 131   3415 if(!c) 131   3387 if(!c)
HITCBC 132   2852 return; 132   2844 return;
HITCBC 133   563 if(c->h && c->h != std::noop_coroutine()) 133   543 if(c->h && c->h != std::noop_coroutine())
HITCBC 134   310 capy::abandon(*c); 134   290 capy::abandon(*c);
HITCBC 135   563 } 135   543 }
136   } 136   }
137   137  
HITCBC 138   1426 impl(std::size_t num_threads, std::string_view thread_name_prefix) 138   1422 impl(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 139   1426 : num_threads_(num_threads) 139   1422 : num_threads_(num_threads)
140   { 140   {
HITCBC 141   1426 if(num_threads_ == 0) 141   1422 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   1426 auto n = thread_name_prefix.copy(thread_name_prefix_, 12); 146   1422 auto n = thread_name_prefix.copy(thread_name_prefix_, 12);
HITCBC 147   1426 thread_name_prefix_[n] = '\0'; 147   1422 thread_name_prefix_[n] = '\0';
HITCBC 148   1426 } 148   1422 }
149   149  
150   void 150   void
HITCBC 151   24729 post(continuation& c) 151   22864 post(continuation& c)
152   { 152   {
HITCBC 153   24729 if(!started_.load(std::memory_order_acquire)) 153   22864 if(!started_.load(std::memory_order_acquire))
154   { 154   {
155   { 155   {
HITCBC 156   592 std::lock_guard<std::mutex> lock(mutex_); 156   588 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 157   592 if(stop_) 157   588 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   592 } 164   588 }
HITCBC 165   372 ensure_started(); 165   368 ensure_started();
166   } 166   }
HITCBC 167   24507 std::lock_guard<std::mutex> lock(mutex_); 167   22642 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 168   24507 push(&c); 168   22642 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   24507 work_cv_.notify_one(); 171   22642 work_cv_.notify_one();
HITCBC 172   24507 } 172   22642 }
173   173  
174   void 174   void
HITCBC 175   4084 on_work_started() noexcept 175   4080 on_work_started() noexcept
176   { 176   {
HITCBC 177   4084 outstanding_work_.fetch_add(1, std::memory_order_acq_rel); 177   4080 outstanding_work_.fetch_add(1, std::memory_order_acq_rel);
HITCBC 178   4084 } 178   4080 }
179   179  
180   void 180   void
HITCBC 181   3784 on_work_finished() noexcept 181   3780 on_work_finished() noexcept
182   { 182   {
HITCBC 183   3784 auto n = outstanding_work_.load(std::memory_order_relaxed); 183   3780 auto n = outstanding_work_.load(std::memory_order_relaxed);
HITCBC 184   3794 while(n > 1) 184   3785 while(n > 1)
185   { 185   {
HITCBC 186   912 if(outstanding_work_.compare_exchange_weak( 186   2574 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   446 return; 188   1282 return;
189   } 189   }
HITCBC 190   3338 std::lock_guard<std::mutex> lock(mutex_); 190   2498 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 191   3338 outstanding_work_.fetch_sub(1, std::memory_order_acq_rel); 191   2498 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   3338 if(outstanding_work_.load( 193   2498 if(outstanding_work_.load(
HITCBC 194   3338 std::memory_order_acquire) == 0 && joined_ && !stop_) 194   2498 std::memory_order_acquire) == 0 && joined_ && !stop_)
195   { 195   {
HITCBC 196   710 stop_ = true; 196   712 stop_ = true;
HITCBC 197   710 done_cv_.notify_all(); 197   712 done_cv_.notify_all();
HITCBC 198   710 work_cv_.notify_all(); 198   712 work_cv_.notify_all();
199   } 199   }
HITCBC 200   3338 } 200   2498 }
201   201  
202   void 202   void
HITCBC 203   2713 join() noexcept 203   2705 join() noexcept
204   { 204   {
205   { 205   {
HITCBC 206   2713 std::unique_lock<std::mutex> lock(mutex_); 206   2705 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 207   2713 if(joined_) 207   2705 if(joined_)
HITCBC 208   1287 return; 208   1283 return;
HITCBC 209   1426 joined_ = true; 209   1422 joined_ = true;
210   210  
HITCBC 211   1426 if(outstanding_work_.load( 211   1422 if(outstanding_work_.load(
HITCBC 212   1426 std::memory_order_acquire) == 0) 212   1422 std::memory_order_acquire) == 0)
213   { 213   {
HITCBC 214   359 stop_ = true; 214   356 stop_ = true;
HITCBC 215   359 work_cv_.notify_all(); 215   356 work_cv_.notify_all();
216   } 216   }
217   else 217   else
218   { 218   {
HITCBC 219   1067 done_cv_.wait(lock, [this]{ 219   1066 done_cv_.wait(lock, [this]{
HITCBC 220   2078 return stop_; 220   2079 return stop_;
221   }); 221   });
222   } 222   }
HITCBC 223   2713 } 223   2705 }
224   224  
HITCBC 225   1919 for(auto& t : threads_) 225   1911 for(auto& t : threads_)
HITCBC 226   493 if(t.joinable()) 226   489 if(t.joinable())
HITCBC 227   493 t.join(); 227   489 t.join();
228   } 228   }
229   229  
230   void 230   void
HITCBC 231   1729 stop() noexcept 231   1725 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   1729 std::lock_guard<std::mutex> lock(mutex_); 235   1725 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 236   1729 stop_ = true; 236   1725 stop_ = true;
HITCBC 237   1729 work_cv_.notify_all(); 237   1725 work_cv_.notify_all();
HITCBC 238   1729 done_cv_.notify_all(); 238   1725 done_cv_.notify_all();
HITCBC 239   1729 } 239   1725 }
240   240  
241   private: 241   private:
242   void 242   void
HITCBC 243   372 ensure_started() 243   368 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   372 std::lock_guard<std::mutex> lock(mutex_); 248   368 std::lock_guard<std::mutex> lock(mutex_);
HITCBC 249   372 if(started_.load(std::memory_order_relaxed) || stop_) 249   368 if(started_.load(std::memory_order_relaxed) || stop_)
HITCBC 250   1 return; 250   1 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   371 threads_.reserve(num_threads_); 253   367 threads_.reserve(num_threads_);
HITCBC 254   864 for(std::size_t i = threads_.size(); i < num_threads_; ++i) 254   856 for(std::size_t i = threads_.size(); i < num_threads_; ++i)
HITCBC 255   988 threads_.emplace_back([this, i]{ run(i); }); 255   980 threads_.emplace_back([this, i]{ run(i); });
HITCBC 256   369 started_.store(true, std::memory_order_release); 256   365 started_.store(true, std::memory_order_release);
HITCBC 257   372 } 257   368 }
258   258  
259   void 259   void
HITCBC 260   493 run(std::size_t index) 260   489 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   493 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index); 264   489 std::snprintf(name, sizeof(name), "%s%zu", thread_name_prefix_, index);
HITCBC 265   493 set_current_thread_name(name); 265   489 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   493 scoped_pool(impl const* p) noexcept { current_.set(p); } 271   489 scoped_pool(impl const* p) noexcept { current_.set(p); }
HITCBC 272   493 ~scoped_pool() noexcept { current_.set(nullptr); } 272   489 ~scoped_pool() noexcept { current_.set(nullptr); }
HITCBC 273   493 } guard(this); 273   489 } guard(this);
274   274  
275   for(;;) 275   for(;;)
276   { 276   {
HITCBC 277   24657 continuation* c = nullptr; 277   22808 continuation* c = nullptr;
278   { 278   {
HITCBC 279   24657 std::unique_lock<std::mutex> lock(mutex_); 279   22808 std::unique_lock<std::mutex> lock(mutex_);
HITCBC 280   24657 work_cv_.wait(lock, [this]{ 280   22808 work_cv_.wait(lock, [this]{
HITCBC 281   63145 return !empty() || 281   66112 return !empty() ||
HITCBC 282   63145 stop_; 282   66112 stop_;
283   }); 283   });
HITCBC 284   24657 if(stop_) 284   22808 if(stop_)
HITCBC 285   986 return; 285   978 return;
HITCBC 286   24164 c = pop(); 286   22319 c = pop();
HITCBC 287   24657 } 287   22808 }
HITCBC 288   24164 if(c) 288   22319 if(c)
HITCBC 289   24164 safe_resume(c->h); 289   22319 safe_resume(c->h);
HITCBC 290   24164 } 290   22319 }
HITCBC 291   493 } 291   489 }
292   }; 292   };
293   293  
294   //------------------------------------------------------------------------------ 294   //------------------------------------------------------------------------------
295   295  
HITCBC 296   1426 thread_pool:: 296   1422 thread_pool::
297   ~thread_pool() 297   ~thread_pool()
298   { 298   {
HITCBC 299   1426 impl_->stop(); 299   1422 impl_->stop();
HITCBC 300   1426 impl_->join(); 300   1422 impl_->join();
HITCBC 301   1426 shutdown(); 301   1422 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   1426 impl_->drain_abandoned(); 304   1422 impl_->drain_abandoned();
HITCBC 305   1426 destroy(); 305   1422 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   1426 impl_->drain_abandoned(); 308   1422 impl_->drain_abandoned();
HITCBC 309   1426 delete impl_; 309   1422 delete impl_;
HITCBC 310   1426 } 310   1422 }
311   311  
HITCBC 312   1426 thread_pool:: 312   1422 thread_pool::
HITCBC 313   1426 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix) 313   1422 thread_pool(std::size_t num_threads, std::string_view thread_name_prefix)
HITCBC 314   1426 : impl_(new impl(num_threads, thread_name_prefix)) 314   1422 : impl_(new impl(num_threads, thread_name_prefix))
315   { 315   {
HITCBC 316   1426 this->set_frame_allocator(std::allocator<void>{}); 316   1422 this->set_frame_allocator(std::allocator<void>{});
HITCBC 317   1426 } 317   1422 }
318   318  
319   void 319   void
HITCBC 320   1287 thread_pool:: 320   1283 thread_pool::
321   join() noexcept 321   join() noexcept
322   { 322   {
HITCBC 323   1287 impl_->join(); 323   1283 impl_->join();
HITCBC 324   1287 } 324   1283 }
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   15345 thread_pool:: 336   15341 thread_pool::
337   get_executor() const noexcept 337   get_executor() const noexcept
338   { 338   {
HITCBC 339   15345 return executor_type( 339   15341 return executor_type(
HITCBC 340   15345 const_cast<thread_pool&>(*this)); 340   15341 const_cast<thread_pool&>(*this));
341   } 341   }
342   342  
343   void 343   void
HITCBC 344   4084 thread_pool::executor_type:: 344   4080 thread_pool::executor_type::
345   on_work_started() const noexcept 345   on_work_started() const noexcept
346   { 346   {
HITCBC 347   4084 pool_->impl_->on_work_started(); 347   4080 pool_->impl_->on_work_started();
HITCBC 348   4084 } 348   4080 }
349   349  
350   void 350   void
HITCBC 351   3784 thread_pool::executor_type:: 351   3780 thread_pool::executor_type::
352   on_work_finished() const noexcept 352   on_work_finished() const noexcept
353   { 353   {
HITCBC 354   3784 pool_->impl_->on_work_finished(); 354   3780 pool_->impl_->on_work_finished();
HITCBC 355   3784 } 355   3780 }
356   356  
357   void 357   void
HITCBC 358   21529 thread_pool::executor_type:: 358   19668 thread_pool::executor_type::
359   post(continuation& c) const 359   post(continuation& c) const
360   { 360   {
HITCBC 361   21529 pool_->impl_->post(c); 361   19668 pool_->impl_->post(c);
HITCBC 362   21527 } 362   19666 }
363   363  
364   std::coroutine_handle<> 364   std::coroutine_handle<>
HITCBC 365   3204 thread_pool::executor_type:: 365   3200 thread_pool::executor_type::
366   dispatch(continuation& c) const 366   dispatch(continuation& c) const
367   { 367   {
HITCBC 368   3204 if(pool_->impl_->running_in_this_thread()) 368   3200 if(pool_->impl_->running_in_this_thread())
HITCBC 369   4 return c.h; 369   4 return c.h;
HITCBC 370   3200 pool_->impl_->post(c); 370   3196 pool_->impl_->post(c);
HITCBC 371   3200 return std::noop_coroutine(); 371   3196 return std::noop_coroutine();
372   } 372   }
373   373  
374   } // capy 374   } // capy
375   } // boost 375   } // boost