并发安全环-基本使用

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/gring"
)

type Player struct {
    position int  // 位置
    alive    bool // 是否存活
}

const (
    playerCount = 41  // 玩家人数
    startPos    = 1   // 开始报数位置
)

var (
    deadline = 3
)

func main() {
    r := gring.New(playerCount)

    // 设置所有玩家初始值
    for i := 1; i <= playerCount; i++ {
        r.Put(&Player{i, true})
    }

    // 如果开始报数的位置不为1，则设置开始位置
    if startPos > 1 {
        r.Move(startPos - 1)
    }

    counter   := 1  // 报数从1开始，因为下面的循环从第二个开始计算
    deadCount := 0  // 死亡人数，初始值为0

    // 直到所有人都死亡，否则循环一直执行
    for deadCount < playerCount {
        // 跳到下一个人
        r.Next()

        // 如果是活着的人，则报数
        if r.Val().(*Player).alive {
            counter++
        }

        // 如果报数为deadline，则此人淘汰出局
        if counter == deadline {
            r.Val().(*Player).alive = false
            fmt.Printf("Player %d died!\n", r.Val().(*Player).position)
            deadCount++
            counter = 0
        }
    }
}

Player 3 died!
Player 6 died!
Player 9 died!
Player 12 died!
Player 15 died!
Player 18 died!
Player 21 died!
Player 24 died!
Player 27 died!
Player 30 died!
Player 33 died!
Player 36 died!
Player 39 died!
Player 1 died!
Player 5 died!
Player 10 died!
Player 14 died!
Player 19 died!
Player 23 died!
Player 28 died!
Player 32 died!
Player 37 died!
Player 41 died!
Player 7 died!
Player 13 died!
Player 20 died!
Player 26 died!
Player 34 died!
Player 40 died!
Player 8 died!
Player 17 died!
Player 29 died!
Player 38 died!
Player 11 died!
Player 25 died!
Player 2 died!
Player 22 died!
Player 4 died!
Player 35 died!
Player 16 died!
Player 31 died!