NNet::TSelect Class Reference

Poller implementation based on the select() system call. More...

#include <select.hpp>

Inheritance diagram for NNet::TSelect:

Public Types
using	TSocket = NNet::TSocket
	Alias for the socket type.
using	TFileHandle = NNet::TFileHandle
	Alias for the file handle type.

Public Member Functions
void	Poll ()
	Polls for I/O events using the select() system call.
Public Member Functions inherited from NNet::TPollerBase
	TPollerBase ()=default
	Default constructor.
	TPollerBase (const TPollerBase &)=delete
	Copying is disabled.
TPollerBase &	operator= (const TPollerBase &)=delete
unsigned	AddTimer (TTime deadline, THandle h)
	Schedules a timer.
bool	RemoveTimer (unsigned timerId, TTime deadline)
	Removes or cancels a timer.
void	AddRead (int fd, THandle h)
	Registers a read event on a file descriptor.
void	AddWrite (int fd, THandle h)
	Registers a write event on a file descriptor.
void	AddRemoteHup (int fd, THandle h)
	Registers a remote hang-up (RHUP) event.
void	RemoveEvent (int fd)
	Removes registered events for a specific file descriptor.
void	RemoveEvent (THandle)
	Removes events associated with a given coroutine handle.
auto	Sleep (TTime until)
	Suspends execution until the specified time.
template<typename Rep , typename Period >
auto	Sleep (std::chrono::duration< Rep, Period > duration)
	Overload of Sleep() accepting a duration.
auto	Yield ()
	Yields execution to the next event loop iteration.
void	Wakeup (TEvent &&change)
	Wakes up a coroutine waiting on an event.
void	WakeupReadyHandles ()
	Wakes up all coroutines waiting on ready events.
void	SetMaxDuration (std::chrono::milliseconds maxDuration)
	Sets the maximum polling duration.
auto	TimersSize () const
	Returns the number of scheduled timers.

Additional Inherited Members
Protected Member Functions inherited from NNet::TPollerBase
timespec	GetTimeout () const
	Computes the poll timeout based on scheduled timers.
void	Reset ()
	Clears the lists of ready events and pending changes.
void	ProcessTimers ()
	Processes scheduled timers.
Static Protected Member Functions inherited from NNet::TPollerBase
static constexpr timespec	GetMaxDuration (std::chrono::milliseconds duration)
	Computes a timespec from a duration.
Protected Attributes inherited from NNet::TPollerBase
int	MaxFd_ = 0
	Highest file descriptor in use.
std::vector< TEvent >	Changes_
	Pending changes (registered events).
std::vector< TEvent >	ReadyEvents_
	Events ready to wake up their coroutines.
unsigned	TimerId_ = 0
	Counter for generating unique timer IDs.
std::priority_queue< TTimer >	Timers_
	Priority queue for scheduled timers.
TTime	LastTimersProcessTime_
	Last time timers were processed.
unsigned	LastFiredTimer_ = (unsigned)(-1)
	ID of the last fired timer.
std::chrono::milliseconds	MaxDuration_ = std::chrono::milliseconds(100)
	Maximum poll duration.
timespec	MaxDurationTs_ = GetMaxDuration(MaxDuration_)
	Max duration represented as timespec.

Detailed Description

Poller implementation based on the select() system call.

TSelect inherits from TPollerBase and implements asynchronous I/O polling using the select() system call. It manages file descriptors using fd_set structures (or equivalent containers on non‑Windows systems) and provides helper functions for obtaining pointers to the read and write fd_sets.

On Windows, a dummy socket is maintained to handle timeouts correctly.

The class also defines convenient type aliases:

• TSocket is defined as NNet::TSocket.
• TFileHandle is defined as NNet::TFileHandle.

Main method:

• Poll() is called to perform the select() operation and process events.

See also

TPollerBase, NNet::TSocket, NNet::TFileHandle.

Member Function Documentation

Poll()

void NNet::TSelect::Poll

(

)

Polls for I/O events using the select() system call.

This method builds the file descriptor sets from the pending events, calls select(), and then processes any triggered events.

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The documentation for this class was generated from the following files:

• coroio/backends/select.hpp
• coroio/backends/select.cpp