. /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   591 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   591 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   591 : epoll_fd_(-1) 146   591 : epoll_fd_(-1)
HITCBC 147   591 , event_fd_(-1) 147   591 , event_fd_(-1)
HITCBC 148   591 , timer_fd_(-1) 148   591 , timer_fd_(-1)
HITCBC 149   1182 , event_buffer_(max_events_per_poll_) 149   1182 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   591 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   591 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   591 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   591 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   591 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   591 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   591 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   591 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   591 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   591 epoll_event ev{}; 172   591 epoll_event ev{};
HITCBC 173   591 ev.events = EPOLLIN | EPOLLET; 173   591 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   591 ev.data.ptr = nullptr; 174   591 ev.data.ptr = nullptr;
HITCBC 175   591 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   591 epoll_event timer_ev{}; 184   591 epoll_event timer_ev{};
HITCBC 185   591 timer_ev.events = EPOLLIN | EPOLLERR; 185   591 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   591 timer_ev.data.ptr = &timer_fd_; 186   591 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   591 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   591 timer_svc_ = &get_timer_service(ctx, *this); 196   591 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   591 timer_svc_->set_on_earliest_changed( 197   591 timer_svc_->set_on_earliest_changed(
HITCBC 198   4648 timer_service::callback(this, [](void* p) { 198   3112 timer_service::callback(this, [](void* p) {
HITCBC 199   4057 auto* self = static_cast<epoll_scheduler*>(p); 199   2521 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4057 self->timerfd_stale_.store(true, std::memory_order_release); 200   2521 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4057 self->interrupt_reactor(); 201   2521 self->interrupt_reactor();
HITCBC 202   4057 })); 202   2521 }));
203   203  
HITCBC 204   591 get_resolver_service(ctx, *this); 204   591 get_resolver_service(ctx, *this);
HITCBC 205   591 get_signal_service(ctx, *this); 205   591 get_signal_service(ctx, *this);
HITCBC 206   591 get_stream_file_service(ctx, *this); 206   591 get_stream_file_service(ctx, *this);
HITCBC 207   591 get_random_access_file_service(ctx, *this); 207   591 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   591 completed_ops_.push(&task_op_); 209   591 completed_ops_.push(&task_op_);
HITCBC 210   591 } 210   591 }
211   211  
HITCBC 212   1182 inline epoll_scheduler::~epoll_scheduler() 212   1182 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   591 if (timer_fd_ >= 0) 214   591 if (timer_fd_ >= 0)
HITCBC 215   591 ::close(timer_fd_); 215   591 ::close(timer_fd_);
HITCBC 216   591 if (event_fd_ >= 0) 216   591 if (event_fd_ >= 0)
HITCBC 217   591 ::close(event_fd_); 217   591 ::close(event_fd_);
HITCBC 218   591 if (epoll_fd_ >= 0) 218   591 if (epoll_fd_ >= 0)
HITCBC 219   591 ::close(epoll_fd_); 219   591 ::close(epoll_fd_);
HITCBC 220   1182 } 220   1182 }
221   221  
222   inline void 222   inline void
HITCBC 223   591 epoll_scheduler::shutdown() 223   591 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   591 shutdown_drain(); 225   591 shutdown_drain();
226   226  
HITCBC 227   591 if (event_fd_ >= 0) 227   591 if (event_fd_ >= 0)
HITCBC 228   591 interrupt_reactor(); 228   591 interrupt_reactor();
HITCBC 229   591 } 229   591 }
230   230  
231   inline void 231   inline void
HITCBC 232   8 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   {
HITCBC 238   8 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);
HITCBC 240   7 event_buffer_.resize(max_events_per_poll_); 240   7 event_buffer_.resize(max_events_per_poll_);
HITCBC 241   7 } 241   7 }
242   242  
243   inline void 243   inline void
HITCBC 244   7972 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   4893 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   7972 epoll_event ev{}; 246   4893 epoll_event ev{};
HITCBC 247   7972 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   4893 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   7972 ev.data.ptr = desc; 248   4893 ev.data.ptr = desc;
249   249  
HITCBC 250   7972 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   4893 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   7972 desc->registered_events = ev.events; 253   4893 desc->registered_events = ev.events;
HITCBC 254   7972 desc->fd = fd; 254   4893 desc->fd = fd;
HITCBC 255   7972 desc->scheduler_ = this; 255   4893 desc->scheduler_ = this;
HITCBC 256   7972 desc->mutex.set_enabled(!single_threaded_); 256   4893 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   7972 desc->ready_events_.store(0, std::memory_order_relaxed); 257   4893 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   7972 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   4893 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   7972 desc->impl_ref_.reset(); 260   4893 desc->impl_ref_.reset();
HITCBC 261   7972 desc->read_ready = false; 261   4893 desc->read_ready = false;
HITCBC 262   7972 desc->write_ready = false; 262   4893 desc->write_ready = false;
HITCBC 263   7972 } 263   4893 }
264   264  
265   inline void 265   inline void
HITCBC 266   7972 epoll_scheduler::deregister_descriptor(int fd) const 266   4893 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   7972 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   4893 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   7972 } 269   4893 }
270   270  
271   inline void 271   inline void
HITCBC 272   5102 epoll_scheduler::interrupt_reactor() const 272   3569 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5102 bool expected = false; 274   3569 bool expected = false;
HITCBC 275   5102 if (eventfd_armed_.compare_exchange_strong( 275   3569 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   4753 std::uint64_t val = 1; 279   3220 std::uint64_t val = 1;
HITCBC 280   4753 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   3220 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5102 } 282   3569 }
283   283  
284   inline void 284   inline void
HITCBC 285   8072 epoll_scheduler::update_timerfd() const 285   4998 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   8072 auto nearest = timer_svc_->nearest_expiry(); 287   4998 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   8072 itimerspec ts{}; 289   4998 itimerspec ts{};
HITCBC 290   8072 int flags = 0; 290   4998 int flags = 0;
291   291  
HITCBC 292   8072 if (nearest == timer_service::time_point::max()) 292   4998 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   7975 auto now = std::chrono::steady_clock::now(); 298   4900 auto now = std::chrono::steady_clock::now();
HITCBC 299   7975 if (nearest <= now) 299   4900 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   509 ts.it_value.tv_nsec = 1; 302   313 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   7466 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   4587 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   7466 nearest - now) 307   4587 nearest - now)
HITCBC 308   7466 .count(); 308   4587 .count();
HITCBC 309   7466 ts.it_value.tv_sec = nsec / 1000000000; 309   4587 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   7466 ts.it_value.tv_nsec = nsec % 1000000000; 310   4587 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   7466 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   4587 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   8072 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   4998 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   8072 } 318   4998 }
319   319  
320   inline void 320   inline void
HITCBC 321   37064 epoll_scheduler::run_task( 321   31771 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   37064 if (task_interrupted_) 325   31771 if (task_interrupted_)
HITCBC 326   25844 timeout_ms = 0; 326   24966 timeout_ms = 0;
HITCBC 327   11220 else if (timeout_us < 0) 327   6805 else if (timeout_us < 0)
HITCBC 328   11216 timeout_ms = -1; 328   6801 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   37064 if (lock.owns_lock()) 332   31771 if (lock.owns_lock())
HITCBC 333   11220 lock.unlock(); 333   6805 lock.unlock();
334   334  
HITCBC 335   37064 task_cleanup on_exit{this, &lock, ctx}; 335   31771 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   37064 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   31771 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4033 update_timerfd(); 339   2497 update_timerfd();
340   340  
HITCBC 341   37064 int nfds = ::epoll_wait( 341   31771 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   37064 static_cast<int>(event_buffer_.size()), timeout_ms); 343   31771 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   37064 if (nfds < 0 && errno != EINTR) 345   31771 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   37064 bool check_timers = false; 348   31771 bool check_timers = false;
HITCBC 349   37064 op_queue local_ops; 349   31771 op_queue local_ops;
350   350  
HITCBC 351   83698 for (int i = 0; i < nfds; ++i) 351   72921 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   46634 if (event_buffer_[i].data.ptr == nullptr) 353   41150 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   4162 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   2629 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4162 eventfd_armed_.store(false, std::memory_order_relaxed); 358   2629 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4162 continue; 359   2629 continue;
HITCBC 360   4162 } 360   2629 }
361   361  
HITCBC 362   42472 if (event_buffer_[i].data.ptr == &timer_fd_) 362   38521 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   4039 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   2501 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4039 check_timers = true; 368   2501 check_timers = true;
HITCBC 369   4039 continue; 369   2501 continue;
HITCBC 370   4039 } 370   2501 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   38433 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   36020 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   38433 desc->add_ready_events(event_buffer_[i].events); 374   36020 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   38433 bool expected = false; 376   36020 bool expected = false;
HITCBC 377   38433 if (desc->is_enqueued_.compare_exchange_strong( 377   36020 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   38433 local_ops.push(desc); 381   36020 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   37064 if (check_timers) 385   31771 if (check_timers)
386   { 386   {
HITCBC 387   4039 timer_svc_->process_expired(); 387   2501 timer_svc_->process_expired();
HITCBC 388   4039 update_timerfd(); 388   2501 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   37064 lock.lock(); 391   31771 lock.lock();
392   392  
HITCBC 393   37064 if (!local_ops.empty()) 393   31771 if (!local_ops.empty())
HITCBC 394   25266 completed_ops_.splice(local_ops); 394   24390 completed_ops_.splice(local_ops);
HITCBC 395   37064 } 395   31771 }
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