. /include/boost/corosio /native /detail /epoll /epoll_scheduler.hpp
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1   // 1   //
2   // Copyright (c) 2026 Steve Gerbino 2   // Copyright (c) 2026 Steve Gerbino
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 4   // Distributed under the Boost Software License, Version 1.0. (See accompanying
5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/corosio 7   // Official repository: https://github.com/cppalliance/corosio
8   // 8   //
9   9  
10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP 10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP
11   #define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP 11   #define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP
12   12  
13   #include <boost/corosio/detail/platform.hpp> 13   #include <boost/corosio/detail/platform.hpp>
14   14  
15   #if BOOST_COROSIO_HAS_EPOLL 15   #if BOOST_COROSIO_HAS_EPOLL
16   16  
17   #include <boost/corosio/detail/config.hpp> 17   #include <boost/corosio/detail/config.hpp>
18   #include <boost/capy/ex/execution_context.hpp> 18   #include <boost/capy/ex/execution_context.hpp>
19   19  
20   #include <boost/corosio/native/detail/reactor/reactor_scheduler.hpp> 20   #include <boost/corosio/native/detail/reactor/reactor_scheduler.hpp>
21   21  
22   #include <boost/corosio/native/detail/epoll/epoll_traits.hpp> 22   #include <boost/corosio/native/detail/epoll/epoll_traits.hpp>
23   #include <boost/corosio/detail/timer_service.hpp> 23   #include <boost/corosio/detail/timer_service.hpp>
24   #include <boost/corosio/native/detail/make_err.hpp> 24   #include <boost/corosio/native/detail/make_err.hpp>
25   #include <boost/corosio/native/detail/posix/posix_resolver_service.hpp> 25   #include <boost/corosio/native/detail/posix/posix_resolver_service.hpp>
26   #include <boost/corosio/native/detail/posix/posix_signal_service.hpp> 26   #include <boost/corosio/native/detail/posix/posix_signal_service.hpp>
27   #include <boost/corosio/native/detail/posix/posix_stream_file_service.hpp> 27   #include <boost/corosio/native/detail/posix/posix_stream_file_service.hpp>
28   #include <boost/corosio/native/detail/posix/posix_random_access_file_service.hpp> 28   #include <boost/corosio/native/detail/posix/posix_random_access_file_service.hpp>
29   29  
30   #include <boost/corosio/detail/except.hpp> 30   #include <boost/corosio/detail/except.hpp>
31   31  
32   #include <atomic> 32   #include <atomic>
33   #include <chrono> 33   #include <chrono>
34   #include <cstdint> 34   #include <cstdint>
35   #include <mutex> 35   #include <mutex>
36   #include <vector> 36   #include <vector>
37   37  
38   #include <errno.h> 38   #include <errno.h>
39   #include <sys/epoll.h> 39   #include <sys/epoll.h>
40   #include <sys/eventfd.h> 40   #include <sys/eventfd.h>
41   #include <sys/timerfd.h> 41   #include <sys/timerfd.h>
42   #include <unistd.h> 42   #include <unistd.h>
43   43  
44   namespace boost::corosio::detail { 44   namespace boost::corosio::detail {
45   45  
46   /** Linux scheduler using epoll for I/O multiplexing. 46   /** Linux scheduler using epoll for I/O multiplexing.
47   47  
48   This scheduler implements the scheduler interface using Linux epoll 48   This scheduler implements the scheduler interface using Linux epoll
49   for efficient I/O event notification. It uses a single reactor model 49   for efficient I/O event notification. It uses a single reactor model
50   where one thread runs epoll_wait while other threads 50   where one thread runs epoll_wait while other threads
51   wait on a condition variable for handler work. This design provides: 51   wait on a condition variable for handler work. This design provides:
52   52  
53   - Handler parallelism: N posted handlers can execute on N threads 53   - Handler parallelism: N posted handlers can execute on N threads
54   - No thundering herd: condition_variable wakes exactly one thread 54   - No thundering herd: condition_variable wakes exactly one thread
55   - IOCP parity: Behavior matches Windows I/O completion port semantics 55   - IOCP parity: Behavior matches Windows I/O completion port semantics
56   56  
57   When threads call run(), they first try to execute queued handlers. 57   When threads call run(), they first try to execute queued handlers.
58   If the queue is empty and no reactor is running, one thread becomes 58   If the queue is empty and no reactor is running, one thread becomes
59   the reactor and runs epoll_wait. Other threads wait on a condition 59   the reactor and runs epoll_wait. Other threads wait on a condition
60   variable until handlers are available. 60   variable until handlers are available.
61   61  
62   @par Thread Safety 62   @par Thread Safety
63   All public member functions are thread-safe. 63   All public member functions are thread-safe.
64   */ 64   */
65   class BOOST_COROSIO_DECL epoll_scheduler final : public reactor_scheduler 65   class BOOST_COROSIO_DECL epoll_scheduler final : public reactor_scheduler
66   { 66   {
67   public: 67   public:
68   /** Construct the scheduler. 68   /** Construct the scheduler.
69   69  
70   Creates an epoll instance, eventfd for reactor interruption, 70   Creates an epoll instance, eventfd for reactor interruption,
71   and timerfd for kernel-managed timer expiry. 71   and timerfd for kernel-managed timer expiry.
72   72  
73   @param ctx Reference to the owning execution_context. 73   @param ctx Reference to the owning execution_context.
74   @param concurrency_hint Hint for expected thread count (unused). 74   @param concurrency_hint Hint for expected thread count (unused).
75   */ 75   */
76   epoll_scheduler(capy::execution_context& ctx, int concurrency_hint = -1); 76   epoll_scheduler(capy::execution_context& ctx, int concurrency_hint = -1);
77   77  
78   /// Destroy the scheduler. 78   /// Destroy the scheduler.
79   ~epoll_scheduler() override; 79   ~epoll_scheduler() override;
80   80  
81   epoll_scheduler(epoll_scheduler const&) = delete; 81   epoll_scheduler(epoll_scheduler const&) = delete;
82   epoll_scheduler& operator=(epoll_scheduler const&) = delete; 82   epoll_scheduler& operator=(epoll_scheduler const&) = delete;
83   83  
84   /// Shut down the scheduler, draining pending operations. 84   /// Shut down the scheduler, draining pending operations.
85   void shutdown() override; 85   void shutdown() override;
86   86  
87   /// Apply runtime configuration, resizing the event buffer. 87   /// Apply runtime configuration, resizing the event buffer.
88   void configure_reactor( 88   void configure_reactor(
89   unsigned max_events, 89   unsigned max_events,
90   unsigned budget_init, 90   unsigned budget_init,
91   unsigned budget_max, 91   unsigned budget_max,
92   unsigned unassisted) override; 92   unsigned unassisted) override;
93   93  
94   /** Return the epoll file descriptor. 94   /** Return the epoll file descriptor.
95   95  
96   Used by socket services to register file descriptors 96   Used by socket services to register file descriptors
97   for I/O event notification. 97   for I/O event notification.
98   98  
99   @return The epoll file descriptor. 99   @return The epoll file descriptor.
100   */ 100   */
101   int epoll_fd() const noexcept 101   int epoll_fd() const noexcept
102   { 102   {
103   return epoll_fd_; 103   return epoll_fd_;
104   } 104   }
105   105  
106   /** Register a descriptor for persistent monitoring. 106   /** Register a descriptor for persistent monitoring.
107   107  
108   The fd is registered once and stays registered until explicitly 108   The fd is registered once and stays registered until explicitly
109   deregistered. Events are dispatched via reactor_descriptor_state which 109   deregistered. Events are dispatched via reactor_descriptor_state which
110   tracks pending read/write/connect operations. 110   tracks pending read/write/connect operations.
111   111  
112   @param fd The file descriptor to register. 112   @param fd The file descriptor to register.
113   @param desc Pointer to descriptor data (stored in epoll_event.data.ptr). 113   @param desc Pointer to descriptor data (stored in epoll_event.data.ptr).
114   */ 114   */
115   void register_descriptor(int fd, reactor_descriptor_state* desc) const; 115   void register_descriptor(int fd, reactor_descriptor_state* desc) const;
116   116  
117   /** Deregister a persistently registered descriptor. 117   /** Deregister a persistently registered descriptor.
118   118  
119   @param fd The file descriptor to deregister. 119   @param fd The file descriptor to deregister.
120   */ 120   */
121   void deregister_descriptor(int fd) const; 121   void deregister_descriptor(int fd) const;
122   122  
123   private: 123   private:
124   void 124   void
125   run_task(lock_type& lock, context_type* ctx, 125   run_task(lock_type& lock, context_type* ctx,
126   long timeout_us) override; 126   long timeout_us) override;
127   void interrupt_reactor() const override; 127   void interrupt_reactor() const override;
128   void update_timerfd() const; 128   void update_timerfd() const;
129   129  
130   int epoll_fd_; 130   int epoll_fd_;
131   int event_fd_; 131   int event_fd_;
132   int timer_fd_; 132   int timer_fd_;
133   133  
134   // Edge-triggered eventfd state 134   // Edge-triggered eventfd state
135   mutable std::atomic<bool> eventfd_armed_{false}; 135   mutable std::atomic<bool> eventfd_armed_{false};
136   136  
137   // Set when the earliest timer changes; flushed before epoll_wait 137   // Set when the earliest timer changes; flushed before epoll_wait
138   mutable std::atomic<bool> timerfd_stale_{false}; 138   mutable std::atomic<bool> timerfd_stale_{false};
139   139  
140   // Event buffer sized from max_events_per_poll_ (set at construction, 140   // Event buffer sized from max_events_per_poll_ (set at construction,
141   // resized by configure_reactor via io_context_options). 141   // resized by configure_reactor via io_context_options).
142   std::vector<epoll_event> event_buffer_; 142   std::vector<epoll_event> event_buffer_;
143   }; 143   };
144   144  
HITCBC 145   373 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   591 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   373 : epoll_fd_(-1) 146   591 : epoll_fd_(-1)
HITCBC 147   373 , event_fd_(-1) 147   591 , event_fd_(-1)
HITCBC 148   373 , timer_fd_(-1) 148   591 , timer_fd_(-1)
HITCBC 149   746 , event_buffer_(max_events_per_poll_) 149   1182 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   373 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   591 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   373 if (epoll_fd_ < 0) 152   591 if (epoll_fd_ < 0)
MISUBC 153   ✗ detail::throw_system_error(make_err(errno), "epoll_create1"); 153   ✗ detail::throw_system_error(make_err(errno), "epoll_create1");
154   154  
HITCBC 155   373 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   591 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   373 if (event_fd_ < 0) 156   591 if (event_fd_ < 0)
157   { 157   {
MISUBC 158   ✗ int errn = errno; 158   ✗ int errn = errno;
MISUBC 159   ✗ ::close(epoll_fd_); 159   ✗ ::close(epoll_fd_);
MISUBC 160   ✗ detail::throw_system_error(make_err(errn), "eventfd"); 160   ✗ detail::throw_system_error(make_err(errn), "eventfd");
161   } 161   }
162   162  
HITCBC 163   373 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   591 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   373 if (timer_fd_ < 0) 164   591 if (timer_fd_ < 0)
165   { 165   {
MISUBC 166   ✗ int errn = errno; 166   ✗ int errn = errno;
MISUBC 167   ✗ ::close(event_fd_); 167   ✗ ::close(event_fd_);
MISUBC 168   ✗ ::close(epoll_fd_); 168   ✗ ::close(epoll_fd_);
MISUBC 169   ✗ detail::throw_system_error(make_err(errn), "timerfd_create"); 169   ✗ detail::throw_system_error(make_err(errn), "timerfd_create");
170   } 170   }
171   171  
HITCBC 172   373 epoll_event ev{}; 172   591 epoll_event ev{};
HITCBC 173   373 ev.events = EPOLLIN | EPOLLET; 173   591 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   373 ev.data.ptr = nullptr; 174   591 ev.data.ptr = nullptr;
HITCBC 175   373 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0) 175   591 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0)
176   { 176   {
MISUBC 177   ✗ int errn = errno; 177   ✗ int errn = errno;
MISUBC 178   ✗ ::close(timer_fd_); 178   ✗ ::close(timer_fd_);
MISUBC 179   ✗ ::close(event_fd_); 179   ✗ ::close(event_fd_);
MISUBC 180   ✗ ::close(epoll_fd_); 180   ✗ ::close(epoll_fd_);
MISUBC 181   ✗ detail::throw_system_error(make_err(errn), "epoll_ctl"); 181   ✗ detail::throw_system_error(make_err(errn), "epoll_ctl");
182   } 182   }
183   183  
HITCBC 184   373 epoll_event timer_ev{}; 184   591 epoll_event timer_ev{};
HITCBC 185   373 timer_ev.events = EPOLLIN | EPOLLERR; 185   591 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   373 timer_ev.data.ptr = &timer_fd_; 186   591 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   373 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0) 187   591 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0)
188   { 188   {
MISUBC 189   ✗ int errn = errno; 189   ✗ int errn = errno;
MISUBC 190   ✗ ::close(timer_fd_); 190   ✗ ::close(timer_fd_);
MISUBC 191   ✗ ::close(event_fd_); 191   ✗ ::close(event_fd_);
MISUBC 192   ✗ ::close(epoll_fd_); 192   ✗ ::close(epoll_fd_);
MISUBC 193   ✗ detail::throw_system_error(make_err(errn), "epoll_ctl (timerfd)"); 193   ✗ detail::throw_system_error(make_err(errn), "epoll_ctl (timerfd)");
194   } 194   }
195   195  
HITCBC 196   373 timer_svc_ = &get_timer_service(ctx, *this); 196   591 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   373 timer_svc_->set_on_earliest_changed( 197   591 timer_svc_->set_on_earliest_changed(
HITCBC 198   5088 timer_service::callback(this, [](void* p) { 198   5659 timer_service::callback(this, [](void* p) {
HITCBC 199   4715 auto* self = static_cast<epoll_scheduler*>(p); 199   5068 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4715 self->timerfd_stale_.store(true, std::memory_order_release); 200   5068 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4715 self->interrupt_reactor(); 201   5068 self->interrupt_reactor();
HITCBC 202   4715 })); 202   5068 }));
203   203  
HITCBC 204   373 get_resolver_service(ctx, *this); 204   591 get_resolver_service(ctx, *this);
HITCBC 205   373 get_signal_service(ctx, *this); 205   591 get_signal_service(ctx, *this);
HITCBC 206   373 get_stream_file_service(ctx, *this); 206   591 get_stream_file_service(ctx, *this);
HITCBC 207   373 get_random_access_file_service(ctx, *this); 207   591 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   373 completed_ops_.push(&task_op_); 209   591 completed_ops_.push(&task_op_);
HITCBC 210   373 } 210   591 }
211   211  
HITCBC 212   746 inline epoll_scheduler::~epoll_scheduler() 212   1182 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   373 if (timer_fd_ >= 0) 214   591 if (timer_fd_ >= 0)
HITCBC 215   373 ::close(timer_fd_); 215   591 ::close(timer_fd_);
HITCBC 216   373 if (event_fd_ >= 0) 216   591 if (event_fd_ >= 0)
HITCBC 217   373 ::close(event_fd_); 217   591 ::close(event_fd_);
HITCBC 218   373 if (epoll_fd_ >= 0) 218   591 if (epoll_fd_ >= 0)
HITCBC 219   373 ::close(epoll_fd_); 219   591 ::close(epoll_fd_);
HITCBC 220   746 } 220   1182 }
221   221  
222   inline void 222   inline void
HITCBC 223   373 epoll_scheduler::shutdown() 223   591 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   373 shutdown_drain(); 225   591 shutdown_drain();
226   226  
HITCBC 227   373 if (event_fd_ >= 0) 227   591 if (event_fd_ >= 0)
HITCBC 228   373 interrupt_reactor(); 228   591 interrupt_reactor();
HITCBC 229   373 } 229   591 }
230   230  
231   inline void 231   inline void
HITGBC 232   ✗ epoll_scheduler::configure_reactor( 232   8 epoll_scheduler::configure_reactor(
233   unsigned max_events, 233   unsigned max_events,
234   unsigned budget_init, 234   unsigned budget_init,
235   unsigned budget_max, 235   unsigned budget_max,
236   unsigned unassisted) 236   unsigned unassisted)
237   { 237   {
HITGBC 238   ✗ reactor_scheduler::configure_reactor( 238   8 reactor_scheduler::configure_reactor(
239   max_events, budget_init, budget_max, unassisted); 239   max_events, budget_init, budget_max, unassisted);
HITGBC 240   ✗ event_buffer_.resize(max_events_per_poll_); 240   7 event_buffer_.resize(max_events_per_poll_);
HITGBC 241   ✗ } 241   7 }
242   242  
243   inline void 243   inline void
HITCBC 244   9170 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   9984 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   9170 epoll_event ev{}; 246   9984 epoll_event ev{};
HITCBC 247   9170 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   9984 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   9170 ev.data.ptr = desc; 248   9984 ev.data.ptr = desc;
249   249  
HITCBC 250   9170 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   9984 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0)
MISUBC 251   ✗ detail::throw_system_error(make_err(errno), "epoll_ctl (register)"); 251   ✗ detail::throw_system_error(make_err(errno), "epoll_ctl (register)");
252   252  
HITCBC 253   9170 desc->registered_events = ev.events; 253   9984 desc->registered_events = ev.events;
HITCBC 254   9170 desc->fd = fd; 254   9984 desc->fd = fd;
HITCBC 255   9170 desc->scheduler_ = this; 255   9984 desc->scheduler_ = this;
HITCBC 256   9170 desc->mutex.set_enabled(!single_threaded_); 256   9984 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   9170 desc->ready_events_.store(0, std::memory_order_relaxed); 257   9984 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   9170 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   9984 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   9170 desc->impl_ref_.reset(); 260   9984 desc->impl_ref_.reset();
HITCBC 261   9170 desc->read_ready = false; 261   9984 desc->read_ready = false;
HITCBC 262   9170 desc->write_ready = false; 262   9984 desc->write_ready = false;
HITCBC 263   9170 } 263   9984 }
264   264  
265   inline void 265   inline void
HITCBC 266   9170 epoll_scheduler::deregister_descriptor(int fd) const 266   9984 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   9170 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   9984 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   9170 } 269   9984 }
270   270  
271   inline void 271   inline void
HITCBC 272   5411 epoll_scheduler::interrupt_reactor() const 272   6113 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5411 bool expected = false; 274   6113 bool expected = false;
HITCBC 275   5411 if (eventfd_armed_.compare_exchange_strong( 275   6113 if (eventfd_armed_.compare_exchange_strong(
276   expected, true, std::memory_order_release, 276   expected, true, std::memory_order_release,
277   std::memory_order_relaxed)) 277   std::memory_order_relaxed))
278   { 278   {
HITCBC 279   5170 std::uint64_t val = 1; 279   5763 std::uint64_t val = 1;
HITCBC 280   5170 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   5763 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5411 } 282   6113 }
283   283  
284   inline void 284   inline void
HITCBC 285   9387 epoll_scheduler::update_timerfd() const 285   10093 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   9387 auto nearest = timer_svc_->nearest_expiry(); 287   10093 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   9387 itimerspec ts{}; 289   10093 itimerspec ts{};
HITCBC 290   9387 int flags = 0; 290   10093 int flags = 0;
291   291  
HITCBC 292   9387 if (nearest == timer_service::time_point::max()) 292   10093 if (nearest == timer_service::time_point::max())
293   { 293   {
294   // No timers — disarm by setting to 0 (relative) 294   // No timers — disarm by setting to 0 (relative)
295   } 295   }
296   else 296   else
297   { 297   {
HITCBC 298   9328 auto now = std::chrono::steady_clock::now(); 298   9995 auto now = std::chrono::steady_clock::now();
HITCBC 299   9328 if (nearest <= now) 299   9995 if (nearest <= now)
300   { 300   {
301   // Use 1ns instead of 0 — zero disarms the timerfd 301   // Use 1ns instead of 0 — zero disarms the timerfd
HITCBC 302   473 ts.it_value.tv_nsec = 1; 302   279 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   8855 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   9716 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   8855 nearest - now) 307   9716 nearest - now)
HITCBC 308   8855 .count(); 308   9716 .count();
HITCBC 309   8855 ts.it_value.tv_sec = nsec / 1000000000; 309   9716 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   8855 ts.it_value.tv_nsec = nsec % 1000000000; 310   9716 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   8855 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   9716 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0)
MISUBC 312   ✗ ts.it_value.tv_nsec = 1; 312   ✗ ts.it_value.tv_nsec = 1;
313   } 313   }
314   } 314   }
315   315  
HITCBC 316   9387 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   10093 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0)
MISUBC 317   ✗ detail::throw_system_error(make_err(errno), "timerfd_settime"); 317   ✗ detail::throw_system_error(make_err(errno), "timerfd_settime");
HITCBC 318   9387 } 318   10093 }
319   319  
320   inline void 320   inline void
HITCBC 321   39326 epoll_scheduler::run_task( 321   41140 epoll_scheduler::run_task(
322   lock_type& lock, context_type* ctx, long timeout_us) 322   lock_type& lock, context_type* ctx, long timeout_us)
323   { 323   {
324   int timeout_ms; 324   int timeout_ms;
HITCBC 325   39326 if (task_interrupted_) 325   41140 if (task_interrupted_)
HITCBC 326   26434 timeout_ms = 0; 326   26878 timeout_ms = 0;
HITCBC 327   12892 else if (timeout_us < 0) 327   14262 else if (timeout_us < 0)
HITCBC 328   12888 timeout_ms = -1; 328   14258 timeout_ms = -1;
329   else 329   else
HITCBC 330   4 timeout_ms = static_cast<int>((timeout_us + 999) / 1000); 330   4 timeout_ms = static_cast<int>((timeout_us + 999) / 1000);
331   331  
HITCBC 332   39326 if (lock.owns_lock()) 332   41140 if (lock.owns_lock())
HITCBC 333   12892 lock.unlock(); 333   14262 lock.unlock();
334   334  
HITCBC 335   39326 task_cleanup on_exit{this, &lock, ctx}; 335   41140 task_cleanup on_exit{this, &lock, ctx};
336   336  
337   // Flush deferred timerfd programming before blocking 337   // Flush deferred timerfd programming before blocking
HITCBC 338   39326 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   41140 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4693 update_timerfd(); 339   5044 update_timerfd();
340   340  
HITCBC 341   39326 int nfds = ::epoll_wait( 341   41140 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   39326 static_cast<int>(event_buffer_.size()), timeout_ms); 343   41140 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   39326 if (nfds < 0 && errno != EINTR) 345   41140 if (nfds < 0 && errno != EINTR)
MISUBC 346   ✗ detail::throw_system_error(make_err(errno), "epoll_wait"); 346   ✗ detail::throw_system_error(make_err(errno), "epoll_wait");
347   347  
HITCBC 348   39326 bool check_timers = false; 348   41140 bool check_timers = false;
HITCBC 349   39326 op_queue local_ops; 349   41140 op_queue local_ops;
350   350  
HITCBC 351   87225 for (int i = 0; i < nfds; ++i) 351   92417 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   47899 if (event_buffer_[i].data.ptr == nullptr) 353   51277 if (event_buffer_[i].data.ptr == nullptr)
354   { 354   {
355   std::uint64_t val; 355   std::uint64_t val;
356   // NOLINTNEXTLINE(clang-analyzer-unix.BlockInCriticalSection) 356   // NOLINTNEXTLINE(clang-analyzer-unix.BlockInCriticalSection)
HITCBC 357   4797 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   5172 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4797 eventfd_armed_.store(false, std::memory_order_relaxed); 358   5172 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4797 continue; 359   5172 continue;
HITCBC 360   4797 } 360   5172 }
361   361  
HITCBC 362   43102 if (event_buffer_[i].data.ptr == &timer_fd_) 362   46105 if (event_buffer_[i].data.ptr == &timer_fd_)
363   { 363   {
364   std::uint64_t expirations; 364   std::uint64_t expirations;
365   // NOLINTNEXTLINE(clang-analyzer-unix.BlockInCriticalSection) 365   // NOLINTNEXTLINE(clang-analyzer-unix.BlockInCriticalSection)
366   [[maybe_unused]] auto r = 366   [[maybe_unused]] auto r =
HITCBC 367   4694 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   5049 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4694 check_timers = true; 368   5049 check_timers = true;
HITCBC 369   4694 continue; 369   5049 continue;
HITCBC 370   4694 } 370   5049 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   38408 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   41056 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   38408 desc->add_ready_events(event_buffer_[i].events); 374   41056 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   38408 bool expected = false; 376   41056 bool expected = false;
HITCBC 377   38408 if (desc->is_enqueued_.compare_exchange_strong( 377   41056 if (desc->is_enqueued_.compare_exchange_strong(
378   expected, true, std::memory_order_release, 378   expected, true, std::memory_order_release,
379   std::memory_order_relaxed)) 379   std::memory_order_relaxed))
380   { 380   {
HITCBC 381   38408 local_ops.push(desc); 381   41056 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   39326 if (check_timers) 385   41140 if (check_timers)
386   { 386   {
HITCBC 387   4694 timer_svc_->process_expired(); 387   5049 timer_svc_->process_expired();
HITCBC 388   4694 update_timerfd(); 388   5049 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   39326 lock.lock(); 391   41140 lock.lock();
392   392  
HITCBC 393   39326 if (!local_ops.empty()) 393   41140 if (!local_ops.empty())
HITCBC 394   25894 completed_ops_.splice(local_ops); 394   26298 completed_ops_.splice(local_ops);
HITCBC 395   39326 } 395   41140 }
396   396  
397   } // namespace boost::corosio::detail 397   } // namespace boost::corosio::detail
398   398  
399   #endif // BOOST_COROSIO_HAS_EPOLL 399   #endif // BOOST_COROSIO_HAS_EPOLL
400   400  
401   #endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP 401   #endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SCHEDULER_HPP