Go 言語の同期メカニズムをマスターする: 同時プログラミング スキルを向上させる

package main

import (
    "fmt"
    "sync"
)

var (
    counter int
    mutex   sync.Mutex
)

func incrementCounter() {
    mutex.Lock()
    defer mutex.Unlock()
    counter++
}

func main() {
    var wg sync.WaitGroup
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            incrementCounter()
        }()
    }
    wg.Wait()
    fmt.Println("Counter:", counter)
}

package main

import "fmt"

func sendData(ch chan<- int) {
    for i := 0; i < 5; i++ {
        ch <- i
    }
    close(ch)
}

func receiveData(ch <-chan int) {
    for v := range ch {
        fmt.Println("Received:", v)
    }
}

func main() {
    ch := make(chan int)
    go sendData(ch)
    receiveData(ch)
}

package main

import (
    "fmt"
    "sync"
)

var (
    done  bool
    cond  *sync.Cond
    mutex sync.Mutex
)

func worker1() {
    mutex.Lock()
    for !done {
        cond.Wait()
    }
    mutex.Unlock()
    fmt.Println("Worker 1: Done")
}

func worker2() {
    mutex.Lock()
    done = true
    cond.Signal()
    mutex.Unlock()
    fmt.Println("Worker 2: Signaled")
}

func main() {
    cond = sync.NewCond(&mutex)
    go worker1()
    go worker2()
}