. /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   646 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   650 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   646 : epoll_fd_(-1) 146   650 : epoll_fd_(-1)
HITCBC 147   646 , event_fd_(-1) 147   650 , event_fd_(-1)
HITCBC 148   646 , timer_fd_(-1) 148   650 , timer_fd_(-1)
HITCBC 149   1292 , event_buffer_(max_events_per_poll_) 149   1300 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   646 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   650 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   646 if (epoll_fd_ < 0) 152   650 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   646 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   650 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   646 if (event_fd_ < 0) 156   650 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   646 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   650 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   646 if (timer_fd_ < 0) 164   650 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   646 epoll_event ev{}; 172   650 epoll_event ev{};
HITCBC 173   646 ev.events = EPOLLIN | EPOLLET; 173   650 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   646 ev.data.ptr = nullptr; 174   650 ev.data.ptr = nullptr;
HITCBC 175   646 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, event_fd_, &ev) < 0) 175   650 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   646 epoll_event timer_ev{}; 184   650 epoll_event timer_ev{};
HITCBC 185   646 timer_ev.events = EPOLLIN | EPOLLERR; 185   650 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   646 timer_ev.data.ptr = &timer_fd_; 186   650 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   646 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &timer_ev) < 0) 187   650 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   646 timer_svc_ = &get_timer_service(ctx, *this); 196   650 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   646 timer_svc_->set_on_earliest_changed( 197   650 timer_svc_->set_on_earliest_changed(
HITCBC 198   5253 timer_service::callback(this, [](void* p) { 198   5274 timer_service::callback(this, [](void* p) {
HITCBC 199   4607 auto* self = static_cast<epoll_scheduler*>(p); 199   4624 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   4607 self->timerfd_stale_.store(true, std::memory_order_release); 200   4624 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   4607 self->interrupt_reactor(); 201   4624 self->interrupt_reactor();
HITCBC 202   4607 })); 202   4624 }));
203   203  
HITCBC 204   646 get_resolver_service(ctx, *this); 204   650 get_resolver_service(ctx, *this);
HITCBC 205   646 get_signal_service(ctx, *this); 205   650 get_signal_service(ctx, *this);
HITCBC 206   646 get_stream_file_service(ctx, *this); 206   650 get_stream_file_service(ctx, *this);
HITCBC 207   646 get_random_access_file_service(ctx, *this); 207   650 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   646 completed_ops_.push(&task_op_); 209   650 completed_ops_.push(&task_op_);
HITCBC 210   646 } 210   650 }
211   211  
HITCBC 212   1292 inline epoll_scheduler::~epoll_scheduler() 212   1300 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   646 if (timer_fd_ >= 0) 214   650 if (timer_fd_ >= 0)
HITCBC 215   646 ::close(timer_fd_); 215   650 ::close(timer_fd_);
HITCBC 216   646 if (event_fd_ >= 0) 216   650 if (event_fd_ >= 0)
HITCBC 217   646 ::close(event_fd_); 217   650 ::close(event_fd_);
HITCBC 218   646 if (epoll_fd_ >= 0) 218   650 if (epoll_fd_ >= 0)
HITCBC 219   646 ::close(epoll_fd_); 219   650 ::close(epoll_fd_);
HITCBC 220   1292 } 220   1300 }
221   221  
222   inline void 222   inline void
HITCBC 223   646 epoll_scheduler::shutdown() 223   650 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   646 shutdown_drain(); 225   650 shutdown_drain();
226   226  
HITCBC 227   646 if (event_fd_ >= 0) 227   650 if (event_fd_ >= 0)
HITCBC 228   646 interrupt_reactor(); 228   650 interrupt_reactor();
HITCBC 229   646 } 229   650 }
230   230  
231   inline void 231   inline void
HITCBC 232   10 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   10 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   9 event_buffer_.resize(max_events_per_poll_); 240   9 event_buffer_.resize(max_events_per_poll_);
HITCBC 241   9 } 241   9 }
242   242  
243   inline void 243   inline void
HITCBC 244   9121 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   9149 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   9121 epoll_event ev{}; 246   9149 epoll_event ev{};
HITCBC 247   9121 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   9149 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   9121 ev.data.ptr = desc; 248   9149 ev.data.ptr = desc;
249   249  
HITCBC 250   9121 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   9149 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   9121 desc->registered_events = ev.events; 253   9149 desc->registered_events = ev.events;
HITCBC 254   9121 desc->fd = fd; 254   9149 desc->fd = fd;
HITCBC 255   9121 desc->scheduler_ = this; 255   9149 desc->scheduler_ = this;
HITCBC 256   9121 desc->mutex.set_enabled(!single_threaded_); 256   9149 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   9121 desc->ready_events_.store(0, std::memory_order_relaxed); 257   9149 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   9121 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   9149 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   9121 desc->impl_ref_.reset(); 260   9149 desc->impl_ref_.reset();
HITCBC 261   9121 desc->read_ready = false; 261   9149 desc->read_ready = false;
HITCBC 262   9121 desc->write_ready = false; 262   9149 desc->write_ready = false;
HITCBC 263   9121 } 263   9149 }
264   264  
265   inline void 265   inline void
HITCBC 266   9121 epoll_scheduler::deregister_descriptor(int fd) const 266   9149 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   9121 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   9149 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   9121 } 269   9149 }
270   270  
271   inline void 271   inline void
HITCBC 272   5757 epoll_scheduler::interrupt_reactor() const 272   5777 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   5757 bool expected = false; 274   5777 bool expected = false;
HITCBC 275   5757 if (eventfd_armed_.compare_exchange_strong( 275   5777 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   5375 std::uint64_t val = 1; 279   5392 std::uint64_t val = 1;
HITCBC 280   5375 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   5392 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   5757 } 282   5777 }
283   283  
284   inline void 284   inline void
HITCBC 285   9173 epoll_scheduler::update_timerfd() const 285   9206 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   9173 auto nearest = timer_svc_->nearest_expiry(); 287   9206 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   9173 itimerspec ts{}; 289   9206 itimerspec ts{};
HITCBC 290   9173 int flags = 0; 290   9206 int flags = 0;
291   291  
HITCBC 292   9173 if (nearest == timer_service::time_point::max()) 292   9206 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   9063 auto now = std::chrono::steady_clock::now(); 298   9095 auto now = std::chrono::steady_clock::now();
HITCBC 299   9063 if (nearest <= now) 299   9095 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   486 ts.it_value.tv_nsec = 1; 302   488 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   8577 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   8607 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   8577 nearest - now) 307   8607 nearest - now)
HITCBC 308   8577 .count(); 308   8607 .count();
HITCBC 309   8577 ts.it_value.tv_sec = nsec / 1000000000; 309   8607 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   8577 ts.it_value.tv_nsec = nsec % 1000000000; 310   8607 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   8577 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   8607 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   9173 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   9206 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   9173 } 318   9206 }
319   319  
320   inline void 320   inline void
HITCBC 321   40695 epoll_scheduler::run_task( 321   39871 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   40695 if (task_interrupted_) 325   39871 if (task_interrupted_)
HITCBC 326   27590 timeout_ms = 0; 326   27135 timeout_ms = 0;
HITCBC 327   13105 else if (timeout_us < 0) 327   12736 else if (timeout_us < 0)
HITCBC 328   13101 timeout_ms = -1; 328   12733 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   40695 if (lock.owns_lock()) 332   39871 if (lock.owns_lock())
HITCBC 333   13105 lock.unlock(); 333   12736 lock.unlock();
334   334  
HITCBC 335   40695 task_cleanup on_exit{this, &lock, ctx}; 335   39871 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   40695 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   39871 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   4584 update_timerfd(); 339   4601 update_timerfd();
340   340  
HITCBC 341   40695 int nfds = ::epoll_wait( 341   39871 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   40695 static_cast<int>(event_buffer_.size()), timeout_ms); 343   39871 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   40695 if (nfds < 0 && errno != EINTR) 345   39871 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   40695 bool check_timers = false; 348   39871 bool check_timers = false;
HITCBC 349   40695 op_queue local_ops; 349   39871 op_queue local_ops;
350   350  
HITCBC 351   90562 for (int i = 0; i < nfds; ++i) 351   90665 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   49867 if (event_buffer_[i].data.ptr == nullptr) 353   50794 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   4729 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   4742 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   4729 eventfd_armed_.store(false, std::memory_order_relaxed); 358   4742 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   4729 continue; 359   4742 continue;
HITCBC 360   4729 } 360   4742 }
361   361  
HITCBC 362   45138 if (event_buffer_[i].data.ptr == &timer_fd_) 362   46052 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   4589 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   4605 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   4589 check_timers = true; 368   4605 check_timers = true;
HITCBC 369   4589 continue; 369   4605 continue;
HITCBC 370   4589 } 370   4605 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   40549 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   41447 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   40549 desc->add_ready_events(event_buffer_[i].events); 374   41447 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   40549 bool expected = false; 376   41447 bool expected = false;
HITCBC 377   40549 if (desc->is_enqueued_.compare_exchange_strong( 377   41447 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   40549 local_ops.push(desc); 381   41447 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   40695 if (check_timers) 385   39871 if (check_timers)
386   { 386   {
HITCBC 387   4589 timer_svc_->process_expired(); 387   4605 timer_svc_->process_expired();
HITCBC 388   4589 update_timerfd(); 388   4605 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   40695 lock.lock(); 391   39871 lock.lock();
392   392  
HITCBC 393   40695 if (!local_ops.empty()) 393   39871 if (!local_ops.empty())
HITCBC 394   27154 completed_ops_.splice(local_ops); 394   26700 completed_ops_.splice(local_ops);
HITCBC 395   40695 } 395   39871 }
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