. /include/boost/corosio /native /detail /epoll /epoll_scheduler.hpp
85.33% Lines (128/150) 100.00% Functions (10/10)
[ ] prev/next file n p prev/next uncovered line
TLA Baseline Branch
Line Hits Code Line Hits Code
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   650 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int) 145   650 inline epoll_scheduler::epoll_scheduler(capy::execution_context& ctx, int)
HITCBC 146   650 : epoll_fd_(-1) 146   650 : epoll_fd_(-1)
HITCBC 147   650 , event_fd_(-1) 147   650 , event_fd_(-1)
HITCBC 148   650 , timer_fd_(-1) 148   650 , timer_fd_(-1)
HITCBC 149   1300 , event_buffer_(max_events_per_poll_) 149   1300 , event_buffer_(max_events_per_poll_)
150   { 150   {
HITCBC 151   650 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); 151   650 epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC);
HITCBC 152   650 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   650 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); 155   650 event_fd_ = ::eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
HITCBC 156   650 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   650 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC); 163   650 timer_fd_ = ::timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
HITCBC 164   650 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   650 epoll_event ev{}; 172   650 epoll_event ev{};
HITCBC 173   650 ev.events = EPOLLIN | EPOLLET; 173   650 ev.events = EPOLLIN | EPOLLET;
HITCBC 174   650 ev.data.ptr = nullptr; 174   650 ev.data.ptr = nullptr;
HITCBC 175   650 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   650 epoll_event timer_ev{}; 184   650 epoll_event timer_ev{};
HITCBC 185   650 timer_ev.events = EPOLLIN | EPOLLERR; 185   650 timer_ev.events = EPOLLIN | EPOLLERR;
HITCBC 186   650 timer_ev.data.ptr = &timer_fd_; 186   650 timer_ev.data.ptr = &timer_fd_;
HITCBC 187   650 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   650 timer_svc_ = &get_timer_service(ctx, *this); 196   650 timer_svc_ = &get_timer_service(ctx, *this);
HITCBC 197   650 timer_svc_->set_on_earliest_changed( 197   650 timer_svc_->set_on_earliest_changed(
HITCBC 198   3998 timer_service::callback(this, [](void* p) { 198   2405 timer_service::callback(this, [](void* p) {
HITCBC 199   3348 auto* self = static_cast<epoll_scheduler*>(p); 199   1755 auto* self = static_cast<epoll_scheduler*>(p);
HITCBC 200   3348 self->timerfd_stale_.store(true, std::memory_order_release); 200   1755 self->timerfd_stale_.store(true, std::memory_order_release);
HITCBC 201   3348 self->interrupt_reactor(); 201   1755 self->interrupt_reactor();
HITCBC 202   3348 })); 202   1755 }));
203   203  
HITCBC 204   650 get_resolver_service(ctx, *this); 204   650 get_resolver_service(ctx, *this);
HITCBC 205   650 get_signal_service(ctx, *this); 205   650 get_signal_service(ctx, *this);
HITCBC 206   650 get_stream_file_service(ctx, *this); 206   650 get_stream_file_service(ctx, *this);
HITCBC 207   650 get_random_access_file_service(ctx, *this); 207   650 get_random_access_file_service(ctx, *this);
208   208  
HITCBC 209   650 completed_ops_.push(&task_op_); 209   650 completed_ops_.push(&task_op_);
HITCBC 210   650 } 210   650 }
211   211  
HITCBC 212   1300 inline epoll_scheduler::~epoll_scheduler() 212   1300 inline epoll_scheduler::~epoll_scheduler()
213   { 213   {
HITCBC 214   650 if (timer_fd_ >= 0) 214   650 if (timer_fd_ >= 0)
HITCBC 215   650 ::close(timer_fd_); 215   650 ::close(timer_fd_);
HITCBC 216   650 if (event_fd_ >= 0) 216   650 if (event_fd_ >= 0)
HITCBC 217   650 ::close(event_fd_); 217   650 ::close(event_fd_);
HITCBC 218   650 if (epoll_fd_ >= 0) 218   650 if (epoll_fd_ >= 0)
HITCBC 219   650 ::close(epoll_fd_); 219   650 ::close(epoll_fd_);
HITCBC 220   1300 } 220   1300 }
221   221  
222   inline void 222   inline void
HITCBC 223   650 epoll_scheduler::shutdown() 223   650 epoll_scheduler::shutdown()
224   { 224   {
HITCBC 225   650 shutdown_drain(); 225   650 shutdown_drain();
226   226  
HITCBC 227   650 if (event_fd_ >= 0) 227   650 if (event_fd_ >= 0)
HITCBC 228   650 interrupt_reactor(); 228   650 interrupt_reactor();
HITCBC 229   650 } 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   6640 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const 244   3468 epoll_scheduler::register_descriptor(int fd, reactor_descriptor_state* desc) const
245   { 245   {
HITCBC 246   6640 epoll_event ev{}; 246   3468 epoll_event ev{};
HITCBC 247   6640 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP; 247   3468 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLERR | EPOLLHUP;
HITCBC 248   6640 ev.data.ptr = desc; 248   3468 ev.data.ptr = desc;
249   249  
HITCBC 250   6640 if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) < 0) 250   3468 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   6640 desc->registered_events = ev.events; 253   3468 desc->registered_events = ev.events;
HITCBC 254   6640 desc->fd = fd; 254   3468 desc->fd = fd;
HITCBC 255   6640 desc->scheduler_ = this; 255   3468 desc->scheduler_ = this;
HITCBC 256   6640 desc->mutex.set_enabled(!single_threaded_); 256   3468 desc->mutex.set_enabled(!single_threaded_);
HITCBC 257   6640 desc->ready_events_.store(0, std::memory_order_relaxed); 257   3468 desc->ready_events_.store(0, std::memory_order_relaxed);
258   258  
HITCBC 259   6640 conditionally_enabled_mutex::scoped_lock lock(desc->mutex); 259   3468 conditionally_enabled_mutex::scoped_lock lock(desc->mutex);
HITCBC 260   6640 desc->impl_ref_.reset(); 260   3468 desc->impl_ref_.reset();
HITCBC 261   6640 desc->read_ready = false; 261   3468 desc->read_ready = false;
HITCBC 262   6640 desc->write_ready = false; 262   3468 desc->write_ready = false;
HITCBC 263   6640 } 263   3468 }
264   264  
265   inline void 265   inline void
HITCBC 266   6640 epoll_scheduler::deregister_descriptor(int fd) const 266   3468 epoll_scheduler::deregister_descriptor(int fd) const
267   { 267   {
HITCBC 268   6640 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr); 268   3468 ::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr);
HITCBC 269   6640 } 269   3468 }
270   270  
271   inline void 271   inline void
HITCBC 272   4490 epoll_scheduler::interrupt_reactor() const 272   2903 epoll_scheduler::interrupt_reactor() const
273   { 273   {
HITCBC 274   4490 bool expected = false; 274   2903 bool expected = false;
HITCBC 275   4490 if (eventfd_armed_.compare_exchange_strong( 275   2903 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   4105 std::uint64_t val = 1; 279   2520 std::uint64_t val = 1;
HITCBC 280   4105 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val)); 280   2520 [[maybe_unused]] auto r = ::write(event_fd_, &val, sizeof(val));
281   } 281   }
HITCBC 282   4490 } 282   2903 }
283   283  
284   inline void 284   inline void
HITCBC 285   6653 epoll_scheduler::update_timerfd() const 285   3467 epoll_scheduler::update_timerfd() const
286   { 286   {
HITCBC 287   6653 auto nearest = timer_svc_->nearest_expiry(); 287   3467 auto nearest = timer_svc_->nearest_expiry();
288   288  
HITCBC 289   6653 itimerspec ts{}; 289   3467 itimerspec ts{};
HITCBC 290   6653 int flags = 0; 290   3467 int flags = 0;
291   291  
HITCBC 292   6653 if (nearest == timer_service::time_point::max()) 292   3467 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   6543 auto now = std::chrono::steady_clock::now(); 298   3356 auto now = std::chrono::steady_clock::now();
HITCBC 299   6543 if (nearest <= now) 299   3356 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   414 ts.it_value.tv_nsec = 1; 302   307 ts.it_value.tv_nsec = 1;
303   } 303   }
304   else 304   else
305   { 305   {
HITCBC 306   6129 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>( 306   3049 auto nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(
HITCBC 307   6129 nearest - now) 307   3049 nearest - now)
HITCBC 308   6129 .count(); 308   3049 .count();
HITCBC 309   6129 ts.it_value.tv_sec = nsec / 1000000000; 309   3049 ts.it_value.tv_sec = nsec / 1000000000;
HITCBC 310   6129 ts.it_value.tv_nsec = nsec % 1000000000; 310   3049 ts.it_value.tv_nsec = nsec % 1000000000;
HITCBC 311   6129 if (ts.it_value.tv_sec == 0 && ts.it_value.tv_nsec == 0) 311   3049 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   6653 if (::timerfd_settime(timer_fd_, flags, &ts, nullptr) < 0) 316   3467 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   6653 } 318   3467 }
319   319  
320   inline void 320   inline void
HITCBC 321   32806 epoll_scheduler::run_task( 321   19329 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   32806 if (task_interrupted_) 325   19329 if (task_interrupted_)
HITCBC 326   23669 timeout_ms = 0; 326   14555 timeout_ms = 0;
HITCBC 327   9137 else if (timeout_us < 0) 327   4774 else if (timeout_us < 0)
HITCBC 328   9133 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   4 timeout_ms = static_cast<int>((timeout_us + 999) / 1000);
331   331  
HITCBC 332   32806 if (lock.owns_lock()) 332   19329 if (lock.owns_lock())
HITCBC 333   9137 lock.unlock(); 333   4774 lock.unlock();
334   334  
HITCBC 335   32806 task_cleanup on_exit{this, &lock, ctx}; 335   19329 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   32806 if (timerfd_stale_.exchange(false, std::memory_order_acquire)) 338   19329 if (timerfd_stale_.exchange(false, std::memory_order_acquire))
HITCBC 339   3325 update_timerfd(); 339   1732 update_timerfd();
340   340  
HITCBC 341   32806 int nfds = ::epoll_wait( 341   19329 int nfds = ::epoll_wait(
342   epoll_fd_, event_buffer_.data(), 342   epoll_fd_, event_buffer_.data(),
HITCBC 343   32806 static_cast<int>(event_buffer_.size()), timeout_ms); 343   19329 static_cast<int>(event_buffer_.size()), timeout_ms);
344   344  
HITCBC 345   32806 if (nfds < 0 && errno != EINTR) 345   19329 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   32806 bool check_timers = false; 348   19329 bool check_timers = false;
HITCBC 349   32806 op_queue local_ops; 349   19329 op_queue local_ops;
350   350  
HITCBC 351   77604 for (int i = 0; i < nfds; ++i) 351   46275 for (int i = 0; i < nfds; ++i)
352   { 352   {
HITCBC 353   44798 if (event_buffer_[i].data.ptr == nullptr) 353   26946 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   3455 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val)); 357   1870 [[maybe_unused]] auto r = ::read(event_fd_, &val, sizeof(val));
HITCBC 358   3455 eventfd_armed_.store(false, std::memory_order_relaxed); 358   1870 eventfd_armed_.store(false, std::memory_order_relaxed);
HITCBC 359   3455 continue; 359   1870 continue;
HITCBC 360   3455 } 360   1870 }
361   361  
HITCBC 362   41343 if (event_buffer_[i].data.ptr == &timer_fd_) 362   25076 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   3328 ::read(timer_fd_, &expirations, sizeof(expirations)); 367   1735 ::read(timer_fd_, &expirations, sizeof(expirations));
HITCBC 368   3328 check_timers = true; 368   1735 check_timers = true;
HITCBC 369   3328 continue; 369   1735 continue;
HITCBC 370   3328 } 370   1735 }
371   371  
372   auto* desc = 372   auto* desc =
HITCBC 373   38015 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr); 373   23341 static_cast<reactor_descriptor_state*>(event_buffer_[i].data.ptr);
HITCBC 374   38015 desc->add_ready_events(event_buffer_[i].events); 374   23341 desc->add_ready_events(event_buffer_[i].events);
375   375  
HITCBC 376   38015 bool expected = false; 376   23341 bool expected = false;
HITCBC 377   38015 if (desc->is_enqueued_.compare_exchange_strong( 377   23341 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   38015 local_ops.push(desc); 381   23341 local_ops.push(desc);
382   } 382   }
383   } 383   }
384   384  
HITCBC 385   32806 if (check_timers) 385   19329 if (check_timers)
386   { 386   {
HITCBC 387   3328 timer_svc_->process_expired(); 387   1735 timer_svc_->process_expired();
HITCBC 388   3328 update_timerfd(); 388   1735 update_timerfd();
389   } 389   }
390   390  
HITCBC 391   32806 lock.lock(); 391   19329 lock.lock();
392   392  
HITCBC 393   32806 if (!local_ops.empty()) 393   19329 if (!local_ops.empty())
HITCBC 394   23257 completed_ops_.splice(local_ops); 394   14147 completed_ops_.splice(local_ops);
HITCBC 395   32806 } 395   19329 }
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