How to reuse objects in Goroutine using sync.Pool from Go standard library?

How to use sync.Pool to reuse objects in Goroutine: Import the "sync" package. Create a variable of type sync.Pool. Get an object using the Get() method. When you are done using the object, put it back into the object pool using the Put() method.

How to use sync.Pool in the Go standard library to reuse objects in Goroutine

sync.Pool is a powerful concurrency tool in the Go standard library. It allows efficient reuse of objects in Goroutines. Doing so improves application performance by reducing allocation and garbage collection overhead.

Using sync.Pool

To use sync.Pool, follow these steps:

1. Import the "sync" package.
2. Create a variable of type sync.Pool.
3. Use the Get() method to get an object. If there is no object available in the object pool, it will create a new object.
4. After using the object, put it back into the object pool and use the Put() method.

Sample Code

The following is an example of reusing string slices using sync.Pool:

package main

import (
    "fmt"
    "sync"
)

var pool = sync.Pool{
    New: func() interface{} {
        return make([]string, 0, 10)
    },
}

func main() {
    s := pool.Get().([]string)
    s = append(s, "Hello")
    s = append(s, "World")
    
    fmt.Println(s) // ["Hello", "World"]
    
    pool.Put(s)
}

In the above example, We created a sync.Pool and specified the New function. This function is used to create a new object, in this case a string slice.

Then we get a string slice from the object pool, add elements to it, and print it out. Finally, we put the string slice back into the object pool so that other Goroutines can reuse it.

Using sync.Pool can significantly improve the performance of your code because it reduces object allocation and garbage collection time. It is useful for managing large numbers of short-lived objects in highly concurrent applications.

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