Golang Concurrency Programming Guide: Exploring the Mysteries of Parallel Processing

Concurrent programming in Go uses lightweight threads (Goroutine) and communication mechanisms (pipelines) to implement parallel task execution. Synchronization primitives (such as mutexes) are used to coordinate access between Goroutines. Practical examples include creating efficient concurrent web services to handle multiple requests.

Go Concurrent Programming Guide: Exploring the Mysteries of Parallel Processing

Introduction

Concurrent programming is a key aspect of modern software development. Allows applications to perform multiple tasks simultaneously, improving efficiency and scalability. The Go language makes it ideal for building concurrent applications through its excellent concurrency support.

Goroutine Basics

Goroutine is a lightweight thread in Go, which is started by the go keyword. They differ from threads in that they share the same memory space but run in different execution streams.

Create a Goroutine in Go Example code:

package main

import "fmt"

func main() {
    go func() {
        fmt.Println("Hello from goroutine")
    }()
    fmt.Println("Hello from main")
}

This code creates a Goroutine that concurrently prints Hello from goroutine, while the main Goroutine prints Hello from main.

Channels are used for communication

Pipelines are a mechanism for communication between Goroutines. They are similar to buffer queues and Goroutines can use them to send and receive messages.

Sample code to create a channel:

package main

import "fmt"

func main() {
    c := make(chan int)
    go func() { c <- 10 }()
    v := <-c
    fmt.Println(v)
}

This code creates a pipe c, a Goroutine sends the value 10 to the channel, and the main Goroutine slaves The channel receives the value and prints it.

Synchronization and waiting

In concurrent programming, synchronization is crucial to ensure coordinated execution between Goroutines. Go provides various synchronization primitives such as mutexes, condition variables, and wait groups.

Use mutex to protect shared data Sample code:

package main

import (
    "fmt"
    "sync"
)

func main() {
    var m sync.Mutex
    var count int
    go func() {
        m.Lock()
        count++
        m.Unlock()
    }()
    m.Lock()
    fmt.Println(count)
    m.Unlock()
}

This code uses mutex m to ensure that only a single Goroutine can access count## at the same time #variable.

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        go func() { fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:]) }()
    })
    log.Fatal(http.ListenAndServe(":8080", nil))
}

The above is the detailed content of Golang Concurrency Programming Guide: Exploring the Mysteries of Parallel Processing. For more information, please follow other related articles on the PHP Chinese website!