. /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   595 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   595 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   595 : epoll_fd_(-1) 146   595 : epoll_fd_(-1)
HITCBC 147   595 , event_fd_(-1) 147   595 , event_fd_(-1)
HITCBC 148   595 , timer_fd_(-1) 148   595 , timer_fd_(-1)
HITCBC 149   1190 , event_buffer_(max_events_per_poll_) 149   1190 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   595 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   595 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   595 if (epoll_fd_ < 0) 152   595 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   595 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   595 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   595 if (event_fd_ < 0) 156   595 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   595 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   595 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   595 if (timer_fd_ < 0) 164   595 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   595 epoll_event ev{}; 172   595 epoll_event ev{};
HITCBC 173   595 ev.events = EPOLLIN | EPOLLET; 173   595 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   595 ev.data.ptr = nullptr; 174   595 ev.data.ptr = nullptr;
HITCBC 175   595 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0) 175   595 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   595 epoll_event timer_ev{}; 184   595 epoll_event timer_ev{};
HITCBC 185   595 timer_ev.events = EPOLLIN | EPOLLERR; 185   595 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   595 timer_ev.data.ptr = &timer_fd_; 186   595 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   595 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0) 187   595 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   595 timer_svc_ = &get_timer_service(ctx, *this); 196   595 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   595 timer_svc_->set_on_earliest_changed( 197   595 timer_svc_->set_on_earliest_changed(
HITCBC 198   5141 timer_service::callback(this, [](void* p) { 198   4229 timer_service::callback(this, [](void* p) {
HITCBC 199   4546 auto* self = static_cast<epoll_scheduler*>(p); 199   3634 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4546 self->timerfd_stale_.store(true, std::memory_order_release); 200   3634 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4546 self->interrupt_reactor(); 201   3634 self->interrupt_reactor();
HITCBC 202   4546 })); 202   3634 }));
203   203  
HITCBC 204   595 get_resolver_service(ctx, *this); 204   595 get_resolver_service(ctx, *this);
HITCBC 205   595 get_signal_service(ctx, *this); 205   595 get_signal_service(ctx, *this);
HITCBC 206   595 get_stream_file_service(ctx, *this); 206   595 get_stream_file_service(ctx, *this);
HITCBC 207   595 get_random_access_file_service(ctx, *this); 207   595 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   595 completed_ops_.push(&task_op_); 209   595 completed_ops_.push(&task_op_);
HITCBC 210   595 } 210   595 }
211   211  
HITCBC 212   1190 inline epoll_scheduler::~epoll_scheduler() 212   1190 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   595 if (timer_fd_ >= 0) 214   595 if (timer_fd_ >= 0)
HITCBC 215   595 ::close(timer_fd_); 215   595 ::close(timer_fd_);
HITCBC 216   595 if (event_fd_ >= 0) 216   595 if (event_fd_ >= 0)
HITCBC 217   595 ::close(event_fd_); 217   595 ::close(event_fd_);
HITCBC 218   595 if (epoll_fd_ >= 0) 218   595 if (epoll_fd_ >= 0)
HITCBC 219   595 ::close(epoll_fd_); 219   595 ::close(epoll_fd_);
HITCBC 220   1190 } 220   1190 }
221   221  
222   inline void 222   inline void
HITCBC 223   595 epoll_scheduler::shutdown() 223   595 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   595 shutdown_drain(); 225   595 shutdown_drain();
226   226  
HITCBC 227   595 if (event_fd_ >= 0) 227   595 if (event_fd_ >= 0)
HITCBC 228   595 interrupt_reactor(); 228   595 interrupt_reactor();
HITCBC 229   595 } 229   595 }
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   8946 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   7136 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   8946 epoll_event ev{}; 246   7136 epoll_event ev{};
HITCBC 247   8946 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   7136 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   8946 ev.data.ptr = desc; 248   7136 ev.data.ptr = desc;
249   249  
HITCBC 250   8946 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   7136 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   8946 desc->registered_events = ev.events; 253   7136 desc->registered_events = ev.events;
HITCBC 254   8946 desc->fd = fd; 254   7136 desc->fd = fd;
HITCBC 255   8946 desc->scheduler_ = this; 255   7136 desc->scheduler_ = this;
HITCBC 256   8946 desc->mutex.set_enabled(!single_threaded_); 256   7136 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   8946 desc->ready_events_.store(0, std::memory_order_relaxed); 257   7136 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   8946 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   7136 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   8946 desc->impl_ref_.reset(); 260   7136 desc->impl_ref_.reset();
HITCBC 261   8946 desc->read_ready = false; 261   7136 desc->read_ready = false;
HITCBC 262   8946 desc->write_ready = false; 262   7136 desc->write_ready = false;
HITCBC 263   8946 } 263   7136 }
264   264  
265   inline void 265   inline void
HITCBC 266   8946 epoll_scheduler::deregister_descriptor(int fd) const 266   7136 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   8946 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   7136 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   8946 } 269   7136 }
270   270  
271   inline void 271   inline void
HITCBC 272   5606 epoll_scheduler::interrupt_reactor() const 272   4695 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5606 bool expected = false; 274   4695 bool expected = false;
HITCBC 275   5606 if (eventfd_armed_.compare_exchange_strong( 275   4695 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   5253 std::uint64_t val = 1; 279   4343 std::uint64_t val = 1;
HITCBC 280   5253 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   4343 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5606 } 282   4695 }
283   283  
284   inline void 284   inline void
HITCBC 285   9050 epoll_scheduler::update_timerfd() const 285   7227 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   9050 auto nearest = timer_svc_->nearest_expiry(); 287   7227 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   9050 itimerspec ts{}; 289   7227 itimerspec ts{};
HITCBC 290   9050 int flags = 0; 290   7227 int flags = 0;
291   291  
HITCBC 292   9050 if (nearest == timer_service::time_point::max()) 292   7227 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   8952 auto now = std::chrono::steady_clock::now(); 298   7130 auto now = std::chrono::steady_clock::now();
HITCBC 299   8952 if (nearest <= now) 299   7130 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   582 ts.it_value.tv_nsec = 1; 302   527 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   8370 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   6603 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   8370 nearest - now) 307   6603 nearest - now)
HITCBC 308   8370 .count(); 308   6603 .count();
HITCBC 309   8370 ts.it_value.tv_sec = nsec / 1000000000; 309   6603 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   8370 ts.it_value.tv_nsec = nsec % 1000000000; 310   6603 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   8370 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   6603 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   9050 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   7227 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   9050 } 318   7227 }
319   319  
320   inline void 320   inline void
HITCBC 321   44013 epoll_scheduler::run_task( 321   40719 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   44013 if (task_interrupted_) 325   40719 if (task_interrupted_)
HITCBC 326   32767 timeout_ms = 0; 326   30824 timeout_ms = 0;
HITCBC 327   11246 else if (timeout_us < 0) 327   9895 else if (timeout_us < 0)
HITCBC 328   11242 timeout_ms = -1; 328   9891 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   44013 if (lock.owns_lock()) 332   40719 if (lock.owns_lock())
HITCBC 333   11246 lock.unlock(); 333   9895 lock.unlock();
334   334  
HITCBC 335   44013 task_cleanup on_exit{this, &lock, ctx}; 335   40719 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   44013 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   40719 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4523 update_timerfd(); 339   3611 update_timerfd();
340   340  
HITCBC 341   44013 int nfds = ::epoll_wait( 341   40719 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   44013 static_cast<int>(event_buffer_.size()), timeout_ms); 343   40719 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   44013 if (nfds < 0 && errno != EINTR) 345   40719 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   44013 bool check_timers = false; 348   40719 bool check_timers = false;
HITCBC 349   44013 op_queue local_ops; 349   40719 op_queue local_ops;
350   350  
HITCBC 351   102776 for (int i = 0; i < nfds; ++i) 351   93303 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   58763 if (event_buffer_[i].data.ptr == nullptr) 353   52584 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   4658 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   3748 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4658 eventfd_armed_.store(false, std::memory_order_relaxed); 358   3748 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4658 continue; 359   3748 continue;
HITCBC 360   4658 } 360   3748 }
361   361  
HITCBC 362   54105 if (event_buffer_[i].data.ptr == &timer_fd_) 362   48836 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   4527 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   3616 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4527 check_timers = true; 368   3616 check_timers = true;
HITCBC 369   4527 continue; 369   3616 continue;
HITCBC 370   4527 } 370   3616 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   49578 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   45220 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   49578 desc->add_ready_events(event_buffer_[i].events); 374   45220 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   49578 bool expected = false; 376   45220 bool expected = false;
HITCBC 377   49578 if (desc->is_enqueued_.compare_exchange_strong( 377   45220 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   49578 local_ops.push(desc); 381   45220 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   44013 if (check_timers) 385   40719 if (check_timers)
386   { 386   {
HITCBC 387   4527 timer_svc_->process_expired(); 387   3616 timer_svc_->process_expired();
HITCBC 388   4527 update_timerfd(); 388   3616 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   44013 lock.lock(); 391   40719 lock.lock();
392   392  
HITCBC 393   44013 if (!local_ops.empty()) 393   40719 if (!local_ops.empty())
HITCBC 394   32193 completed_ops_.splice(local_ops); 394   30249 completed_ops_.splice(local_ops);
HITCBC 395   44013 } 395   40719 }
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