. /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   593 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   593 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   593 : epoll_fd_(-1) 146   593 : epoll_fd_(-1)
HITCBC 147   593 , event_fd_(-1) 147   593 , event_fd_(-1)
HITCBC 148   593 , timer_fd_(-1) 148   593 , timer_fd_(-1)
HITCBC 149   1186 , event_buffer_(max_events_per_poll_) 149   1186 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   593 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   593 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   593 if (epoll_fd_ < 0) 152   593 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   593 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   593 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   593 if (event_fd_ < 0) 156   593 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   593 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   593 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   593 if (timer_fd_ < 0) 164   593 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   593 epoll_event ev{}; 172   593 epoll_event ev{};
HITCBC 173   593 ev.events = EPOLLIN | EPOLLET; 173   593 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   593 ev.data.ptr = nullptr; 174   593 ev.data.ptr = nullptr;
HITCBC 175   593 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0) 175   593 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   593 epoll_event timer_ev{}; 184   593 epoll_event timer_ev{};
HITCBC 185   593 timer_ev.events = EPOLLIN | EPOLLERR; 185   593 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   593 timer_ev.data.ptr = &timer_fd_; 186   593 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   593 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0) 187   593 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   593 timer_svc_ = &get_timer_service(ctx, *this); 196   593 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   593 timer_svc_->set_on_earliest_changed( 197   593 timer_svc_->set_on_earliest_changed(
HITCBC 198   5183 timer_service::callback(this, [](void* p) { 198   2550 timer_service::callback(this, [](void* p) {
HITCBC 199   4590 auto* self = static_cast<epoll_scheduler*>(p); 199   1957 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4590 self->timerfd_stale_.store(true, std::memory_order_release); 200   1957 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4590 self->interrupt_reactor(); 201   1957 self->interrupt_reactor();
HITCBC 202   4590 })); 202   1957 }));
203   203  
HITCBC 204   593 get_resolver_service(ctx, *this); 204   593 get_resolver_service(ctx, *this);
HITCBC 205   593 get_signal_service(ctx, *this); 205   593 get_signal_service(ctx, *this);
HITCBC 206   593 get_stream_file_service(ctx, *this); 206   593 get_stream_file_service(ctx, *this);
HITCBC 207   593 get_random_access_file_service(ctx, *this); 207   593 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   593 completed_ops_.push(&task_op_); 209   593 completed_ops_.push(&task_op_);
HITCBC 210   593 } 210   593 }
211   211  
HITCBC 212   1186 inline epoll_scheduler::~epoll_scheduler() 212   1186 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   593 if (timer_fd_ >= 0) 214   593 if (timer_fd_ >= 0)
HITCBC 215   593 ::close(timer_fd_); 215   593 ::close(timer_fd_);
HITCBC 216   593 if (event_fd_ >= 0) 216   593 if (event_fd_ >= 0)
HITCBC 217   593 ::close(event_fd_); 217   593 ::close(event_fd_);
HITCBC 218   593 if (epoll_fd_ >= 0) 218   593 if (epoll_fd_ >= 0)
HITCBC 219   593 ::close(epoll_fd_); 219   593 ::close(epoll_fd_);
HITCBC 220   1186 } 220   1186 }
221   221  
222   inline void 222   inline void
HITCBC 223   593 epoll_scheduler::shutdown() 223   593 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   593 shutdown_drain(); 225   593 shutdown_drain();
226   226  
HITCBC 227   593 if (event_fd_ >= 0) 227   593 if (event_fd_ >= 0)
HITCBC 228   593 interrupt_reactor(); 228   593 interrupt_reactor();
HITCBC 229   593 } 229   593 }
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   9036 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   3793 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   9036 epoll_event ev{}; 246   3793 epoll_event ev{};
HITCBC 247   9036 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   3793 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   9036 ev.data.ptr = desc; 248   3793 ev.data.ptr = desc;
249   249  
HITCBC 250   9036 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   3793 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   9036 desc->registered_events = ev.events; 253   3793 desc->registered_events = ev.events;
HITCBC 254   9036 desc->fd = fd; 254   3793 desc->fd = fd;
HITCBC 255   9036 desc->scheduler_ = this; 255   3793 desc->scheduler_ = this;
HITCBC 256   9036 desc->mutex.set_enabled(!single_threaded_); 256   3793 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   9036 desc->ready_events_.store(0, std::memory_order_relaxed); 257   3793 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   9036 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   3793 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   9036 desc->impl_ref_.reset(); 260   3793 desc->impl_ref_.reset();
HITCBC 261   9036 desc->read_ready = false; 261   3793 desc->read_ready = false;
HITCBC 262   9036 desc->write_ready = false; 262   3793 desc->write_ready = false;
HITCBC 263   9036 } 263   3793 }
264   264  
265   inline void 265   inline void
HITCBC 266   9036 epoll_scheduler::deregister_descriptor(int fd) const 266   3793 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   9036 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   3793 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   9036 } 269   3793 }
270   270  
271   inline void 271   inline void
HITCBC 272   5648 epoll_scheduler::interrupt_reactor() const 272   3007 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5648 bool expected = false; 274   3007 bool expected = false;
HITCBC 275   5648 if (eventfd_armed_.compare_exchange_strong( 275   3007 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   5297 std::uint64_t val = 1; 279   2660 std::uint64_t val = 1;
HITCBC 280   5297 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   2660 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5648 } 282   3007 }
283   283  
284   inline void 284   inline void
HITCBC 285   9138 epoll_scheduler::update_timerfd() const 285   3870 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   9138 auto nearest = timer_svc_->nearest_expiry(); 287   3870 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   9138 itimerspec ts{}; 289   3870 itimerspec ts{};
HITCBC 290   9138 int flags = 0; 290   3870 int flags = 0;
291   291  
HITCBC 292   9138 if (nearest == timer_service::time_point::max()) 292   3870 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   9041 auto now = std::chrono::steady_clock::now(); 298   3773 auto now = std::chrono::steady_clock::now();
HITCBC 299   9041 if (nearest <= now) 299   3773 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   357 ts.it_value.tv_nsec = 1; 302   613 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   8684 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   3160 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   8684 nearest - now) 307   3160 nearest - now)
HITCBC 308   8684 .count(); 308   3160 .count();
HITCBC 309   8684 ts.it_value.tv_sec = nsec / 1000000000; 309   3160 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   8684 ts.it_value.tv_nsec = nsec % 1000000000; 310   3160 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   8684 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   3160 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   9138 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   3870 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   9138 } 318   3870 }
319   319  
320   inline void 320   inline void
HITCBC 321   39653 epoll_scheduler::run_task( 321   30490 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   39653 if (task_interrupted_) 325   30490 if (task_interrupted_)
HITCBC 326   26709 timeout_ms = 0; 326   25717 timeout_ms = 0;
HITCBC 327   12944 else if (timeout_us < 0) 327   4773 else if (timeout_us < 0)
HITCBC 328   12940 timeout_ms = -1; 328   4770 timeout_ms = -1;
329   else 329   else
HITCBC 330   4 timeout_ms = static_cast<int>((timeout_us + 999) / 1000); 330   3 timeout_ms = static_cast<int>((timeout_us + 999) / 1000);
331   331  
HITCBC 332   39653 if (lock.owns_lock()) 332   30490 if (lock.owns_lock())
HITCBC 333   12944 lock.unlock(); 333   4773 lock.unlock();
334   334  
HITCBC 335   39653 task_cleanup on_exit{this, &lock, ctx}; 335   30490 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   39653 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   30490 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4566 update_timerfd(); 339   1933 update_timerfd();
340   340  
HITCBC 341   39653 int nfds = ::epoll_wait( 341   30490 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   39653 static_cast<int>(event_buffer_.size()), timeout_ms); 343   30490 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   39653 if (nfds < 0 && errno != EINTR) 345   30490 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   39653 bool check_timers = false; 348   30490 bool check_timers = false;
HITCBC 349   39653 op_queue local_ops; 349   30490 op_queue local_ops;
350   350  
HITCBC 351   87935 for (int i = 0; i < nfds; ++i) 351   72264 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   48282 if (event_buffer_[i].data.ptr == nullptr) 353   41774 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   4704 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   2067 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4704 eventfd_armed_.store(false, std::memory_order_relaxed); 358   2067 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4704 continue; 359   2067 continue;
HITCBC 360   4704 } 360   2067 }
361   361  
HITCBC 362   43578 if (event_buffer_[i].data.ptr == &timer_fd_) 362   39707 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   4572 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   1937 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4572 check_timers = true; 368   1937 check_timers = true;
HITCBC 369   4572 continue; 369   1937 continue;
HITCBC 370   4572 } 370   1937 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   39006 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   37770 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   39006 desc->add_ready_events(event_buffer_[i].events); 374   37770 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   39006 bool expected = false; 376   37770 bool expected = false;
HITCBC 377   39006 if (desc->is_enqueued_.compare_exchange_strong( 377   37770 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   39006 local_ops.push(desc); 381   37770 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   39653 if (check_timers) 385   30490 if (check_timers)
386   { 386   {
HITCBC 387   4572 timer_svc_->process_expired(); 387   1937 timer_svc_->process_expired();
HITCBC 388   4572 update_timerfd(); 388   1937 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   39653 lock.lock(); 391   30490 lock.lock();
392   392  
HITCBC 393   39653 if (!local_ops.empty()) 393   30490 if (!local_ops.empty())
HITCBC 394   26138 completed_ops_.splice(local_ops); 394   25148 completed_ops_.splice(local_ops);
HITCBC 395   39653 } 395   30490 }
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