. /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   644 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   595 : epoll_fd_(-1) 146   644 : epoll_fd_(-1)
HITCBC 147   595 , event_fd_(-1) 147   644 , event_fd_(-1)
HITCBC 148   595 , timer_fd_(-1) 148   644 , timer_fd_(-1)
HITCBC 149   1190 , event_buffer_(max_events_per_poll_) 149   1288 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   595 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   644 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   595 if (epoll_fd_ < 0) 152   644 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   644 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   595 if (event_fd_ < 0) 156   644 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   644 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   595 if (timer_fd_ < 0) 164   644 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   644 epoll_event ev{};
HITCBC 173   595 ev.events = EPOLLIN | EPOLLET; 173   644 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   595 ev.data.ptr = nullptr; 174   644 ev.data.ptr = nullptr;
HITCBC 175   595 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0) 175   644 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   644 epoll_event timer_ev{};
HITCBC 185   595 timer_ev.events = EPOLLIN | EPOLLERR; 185   644 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   595 timer_ev.data.ptr = &timer_fd_; 186   644 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   595 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0) 187   644 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   644 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   595 timer_svc_->set_on_earliest_changed( 197   644 timer_svc_->set_on_earliest_changed(
HITCBC 198   5291 timer_service::callback(this, [](void* p) { 198   5448 timer_service::callback(this, [](void* p) {
HITCBC 199   4696 auto* self = static_cast<epoll_scheduler*>(p); 199   4804 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4696 self->timerfd_stale_.store(true, std::memory_order_release); 200   4804 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4696 self->interrupt_reactor(); 201   4804 self->interrupt_reactor();
HITCBC 202   4696 })); 202   4804 }));
203   203  
HITCBC 204   595 get_resolver_service(ctx, *this); 204   644 get_resolver_service(ctx, *this);
HITCBC 205   595 get_signal_service(ctx, *this); 205   644 get_signal_service(ctx, *this);
HITCBC 206   595 get_stream_file_service(ctx, *this); 206   644 get_stream_file_service(ctx, *this);
HITCBC 207   595 get_random_access_file_service(ctx, *this); 207   644 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   595 completed_ops_.push(&task_op_); 209   644 completed_ops_.push(&task_op_);
HITCBC 210   595 } 210   644 }
211   211  
HITCBC 212   1190 inline epoll_scheduler::~epoll_scheduler() 212   1288 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   595 if (timer_fd_ >= 0) 214   644 if (timer_fd_ >= 0)
HITCBC 215   595 ::close(timer_fd_); 215   644 ::close(timer_fd_);
HITCBC 216   595 if (event_fd_ >= 0) 216   644 if (event_fd_ >= 0)
HITCBC 217   595 ::close(event_fd_); 217   644 ::close(event_fd_);
HITCBC 218   595 if (epoll_fd_ >= 0) 218   644 if (epoll_fd_ >= 0)
HITCBC 219   595 ::close(epoll_fd_); 219   644 ::close(epoll_fd_);
HITCBC 220   1190 } 220   1288 }
221   221  
222   inline void 222   inline void
HITCBC 223   595 epoll_scheduler::shutdown() 223   644 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   595 shutdown_drain(); 225   644 shutdown_drain();
226   226  
HITCBC 227   595 if (event_fd_ >= 0) 227   644 if (event_fd_ >= 0)
HITCBC 228   595 interrupt_reactor(); 228   644 interrupt_reactor();
HITCBC 229   595 } 229   644 }
230   230  
231   inline void 231   inline void
HITCBC 232   8 epoll_scheduler::configure_reactor( 232   10 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   10 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   9 event_buffer_.resize(max_events_per_poll_);
HITCBC 241   7 } 241   9 }
242   242  
243   inline void 243   inline void
HITCBC 244   9254 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   9509 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   9254 epoll_event ev{}; 246   9509 epoll_event ev{};
HITCBC 247   9254 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   9509 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   9254 ev.data.ptr = desc; 248   9509 ev.data.ptr = desc;
249   249  
HITCBC 250   9254 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   9509 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   9254 desc->registered_events = ev.events; 253   9509 desc->registered_events = ev.events;
HITCBC 254   9254 desc->fd = fd; 254   9509 desc->fd = fd;
HITCBC 255   9254 desc->scheduler_ = this; 255   9509 desc->scheduler_ = this;
HITCBC 256   9254 desc->mutex.set_enabled(!single_threaded_); 256   9509 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   9254 desc->ready_events_.store(0, std::memory_order_relaxed); 257   9509 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   9254 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   9509 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   9254 desc->impl_ref_.reset(); 260   9509 desc->impl_ref_.reset();
HITCBC 261   9254 desc->read_ready = false; 261   9509 desc->read_ready = false;
HITCBC 262   9254 desc->write_ready = false; 262   9509 desc->write_ready = false;
HITCBC 263   9254 } 263   9509 }
264   264  
265   inline void 265   inline void
HITCBC 266   9254 epoll_scheduler::deregister_descriptor(int fd) const 266   9509 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   9254 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   9509 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   9254 } 269   9509 }
270   270  
271   inline void 271   inline void
HITCBC 272   5753 epoll_scheduler::interrupt_reactor() const 272   5951 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5753 bool expected = false; 274   5951 bool expected = false;
HITCBC 275   5753 if (eventfd_armed_.compare_exchange_strong( 275   5951 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   5399 std::uint64_t val = 1; 279   5567 std::uint64_t val = 1;
HITCBC 280   5399 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   5567 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5753 } 282   5951 }
283   283  
284   inline void 284   inline void
HITCBC 285   9351 epoll_scheduler::update_timerfd() const 285   9564 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   9351 auto nearest = timer_svc_->nearest_expiry(); 287   9564 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   9351 itimerspec ts{}; 289   9564 itimerspec ts{};
HITCBC 290   9351 int flags = 0; 290   9564 int flags = 0;
291   291  
HITCBC 292   9351 if (nearest == timer_service::time_point::max()) 292   9564 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   9254 auto now = std::chrono::steady_clock::now(); 298   9453 auto now = std::chrono::steady_clock::now();
HITCBC 299   9254 if (nearest <= now) 299   9453 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   361 ts.it_value.tv_nsec = 1; 302   329 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   8893 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   9124 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   8893 nearest - now) 307   9124 nearest - now)
HITCBC 308   8893 .count(); 308   9124 .count();
HITCBC 309   8893 ts.it_value.tv_sec = nsec / 1000000000; 309   9124 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   8893 ts.it_value.tv_nsec = nsec % 1000000000; 310   9124 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   8893 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   9124 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   9351 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   9564 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   9351 } 318   9564 }
319   319  
320   inline void 320   inline void
HITCBC 321   37769 epoll_scheduler::run_task( 321   39561 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   37769 if (task_interrupted_) 325   39561 if (task_interrupted_)
HITCBC 326   24517 timeout_ms = 0; 326   25725 timeout_ms = 0;
HITCBC 327   13252 else if (timeout_us < 0) 327   13836 else if (timeout_us < 0)
HITCBC 328   13248 timeout_ms = -1; 328   13832 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   37769 if (lock.owns_lock()) 332   39561 if (lock.owns_lock())
HITCBC 333   13252 lock.unlock(); 333   13836 lock.unlock();
334   334  
HITCBC 335   37769 task_cleanup on_exit{this, &lock, ctx}; 335   39561 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   37769 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   39561 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4673 update_timerfd(); 339   4781 update_timerfd();
340   340  
HITCBC 341   37769 int nfds = ::epoll_wait( 341   39561 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   37769 static_cast<int>(event_buffer_.size()), timeout_ms); 343   39561 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   37769 if (nfds < 0 && errno != EINTR) 345   39561 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   37769 bool check_timers = false; 348   39561 bool check_timers = false;
HITCBC 349   37769 op_queue local_ops; 349   39561 op_queue local_ops;
350   350  
HITCBC 351   86042 for (int i = 0; i < nfds; ++i) 351   89936 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   48273 if (event_buffer_[i].data.ptr == nullptr) 353   50375 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   4804 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   4923 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4804 eventfd_armed_.store(false, std::memory_order_relaxed); 358   4923 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4804 continue; 359   4923 continue;
HITCBC 360   4804 } 360   4923 }
361   361  
HITCBC 362   43469 if (event_buffer_[i].data.ptr == &timer_fd_) 362   45452 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   4678 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   4783 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4678 check_timers = true; 368   4783 check_timers = true;
HITCBC 369   4678 continue; 369   4783 continue;
HITCBC 370   4678 } 370   4783 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   38791 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   40669 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   38791 desc->add_ready_events(event_buffer_[i].events); 374   40669 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   38791 bool expected = false; 376   40669 bool expected = false;
HITCBC 377   38791 if (desc->is_enqueued_.compare_exchange_strong( 377   40669 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   38791 local_ops.push(desc); 381   40669 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   37769 if (check_timers) 385   39561 if (check_timers)
386   { 386   {
HITCBC 387   4678 timer_svc_->process_expired(); 387   4783 timer_svc_->process_expired();
HITCBC 388   4678 update_timerfd(); 388   4783 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   37769 lock.lock(); 391   39561 lock.lock();
392   392  
HITCBC 393   37769 if (!local_ops.empty()) 393   39561 if (!local_ops.empty())
HITCBC 394   23943 completed_ops_.splice(local_ops); 394   25289 completed_ops_.splice(local_ops);
HITCBC 395   37769 } 395   39561 }
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