To clear a slice in Go, you can re-slice it to a zero-length slice, like this:

go
 
 
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slice := []int{1, 2, 3, 4}
slice = slice[:0]

This creates a new slice starting from the beginning of the original, and ending at index 0 (which means the new slice has zero length). This effectively clears the original slice because no elements are left in it.

You can also set the slice to nil, which will release the underlying array for garbage collection:

go
 
 
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slice := []int{1, 2, 3, 4}
slice = nil

Both methods achieve the same result, so you can choose the one that fits your use case better.

Here's some documentation on slices in Go, in case you want to learn more: https://tour.golang.org/moretypes/7

In Go, a poller is a mechanism that efficiently waits for events or input/output (I/O) operations on multiple file descriptors or network connections. The Go standard library includes a few poller implementations, such as epoll for Linux and kqueue for macOS and FreeBSD.

Here's an example of creating a poller in Go using the epoll package:

go
 
 
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package main

import (
    "fmt"
    "net"
    "golang.org/x/sys/unix"
)

func main() {
    fd, err := unix.EpollCreate1(0)
    if err != nil {
        fmt.Println("Error creating epoll:", err)
        return
    }
    defer unix.Close(fd)

    listener, err := net.Listen("tcp", ":8080")
    if err != nil {
        fmt.Println("Error listening:", err)
        return
    }
    defer listener.Close()

    err = unix.EpollCtl(fd, unix.EPOLL_CTL_ADD, int(listener.(*net.TCPListener).Fd()), &unix.EpollEvent{
        Events: unix.EPOLLIN | unix.EPOLLET,
        Fd:     int32(listener.(*net.TCPListener).Fd()),
    })
    if err != nil {
        fmt.Println("Error adding listener to epoll:", err)
        return
    }

    events := make([]unix.EpollEvent, 10)
    for {
        n, err := unix.EpollWait(fd, events, -1)
        if err != nil {
            fmt.Println("Error waiting for events:", err)
            continue
        }

        for i := 0; i < n; i++ {
            if events[i].Fd == int32(listener.(*net.TCPListener).Fd()) {
                conn, err := listener.Accept()
                if err != nil {
                    fmt.Println("Error accepting connection:", err)
                    continue
                }

                // handle connection
            } else {
                // handle I/O on other file descriptors
            }
        }
    }
}

This code creates an epoll instance, adds a TCP listener to it, and waits for incoming connections. When a connection is accepted, it can be handled separately from the poller loop.

Go (often referred to as golang) is an open-source programming language developed by Google. It is statically typed, with garbage collection and memory safety features built-in. Go enables developers to easily create powerful, performant programs that are free from memory-related errors, while still allowing the development of code that is relatively easy to read and write. More information on Go can be found on its official website at golang.org.