How is the pool in golang function implemented?

Using sync.Pool to implement function pool in Go language includes the following steps: creating a sync.Pool structure, maintaining a function pointer slice and a mutex lock. When the function call is completed, add itself to the function pool. The next time the function is called, get a function pointer from the pool and call the function.

Implementation of function pool in Go language

Function pool is an optimization technology that can improve function calling performance. The Go language provides a built-in sync.Pool type for implementing function pools.

Implementation

sync.Pool The type is a structure that maintains a slice of function pointers and a mutex lock. When a function call completes, it adds itself to the function pool. The next time the function is called, sync.Pool gets a function pointer from the pool and calls the function.

import (
    "sync"
)

var pool sync.Pool

func init() {
    pool = sync.Pool{
        New: func() interface{} {
            return newFunction()
        },
    }
}

func newFunction() *function {
    // 创建一个新函数实例
    return &function{
        // 初始化函数字段
    }
}

func getFunction() *function {
    f := pool.Get().(*function)
    // 重置函数字段
    f.Reset()
    return f
}

func putFunction(f *function) {
    pool.Put(f)
}

type function struct {
    // 函数字段
}

Practical case

The following example shows how to use function pool in a practical application:

package main

import (
    "sync"
    "time"
)

var pool sync.Pool

func init() {
    pool = sync.Pool{
        New: func() interface{} {
            return time.NewTimer(1 * time.Second)
        },
    }
}

func main() {
    // 获取计时器
    t := pool.Get().(*time.Timer)
    defer pool.Put(t)

    // 等待计时器到期
    <-t.C
}

In this example, sync .Pool is used to manage the time.Timer object, which is used for the timer function. It can improve the performance of time.Timer because the timer can be reused when no longer needed, rather than recreated.

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