Go 上下文-WithDeadline()与WithTimeout()的比较
以下代码:Go 上下文-WithDeadline()与WithTimeout()的比较,go,channel,goroutine,Go,Channel,Goroutine,以下代码: // Sample program to show how to use the WithDeadline function // of the Context package. package main import ( "context" "fmt" "time" ) type data struct { UserID string } func main() { // S
// Sample program to show how to use the WithDeadline function
// of the Context package.
package main
import (
"context"
"fmt"
"time"
)
type data struct {
UserID string
}
func main() {
// Set a duration.
// duration := 150 * time.Millisecond
duration := time.Now().Add(3 * time.Second)
// Create a context that is both manually cancellable and will signal
// a cancel at the specified duration.
ctx, cancel := context.WithDeadline(context.Background(), duration)
defer cancel()
// Create a channel to received a signal that work is done.
ch := make(chan data, 1)
// Ask the goroutine to do some work for us.
go func() {
// Simulate work.
time.Sleep(50 * time.Millisecond)
// Report the work is done.
ch <- data{"123"}
}()
// Wait for the work to finish. If it takes too long move on.
select {
case d := <-ch:
fmt.Println("work complete", d)
case <-ctx.Done():
fmt.Println("work cancelled")
}
}
在内部,context.WithTimeout调用context.WithDeadline函数,并通过向当前时间添加超时来生成截止日期
context.WithTimeout与context.WithDeadline有何不同WithTimeout是使用DeadLineParent time.Now.Addtimeout执行的方便函数 这些函数在应用程序指定截止日期的方式上有所不同。否则它们是一样的 调用适合现有值的函数
context.WithTimeout与context.WithDeadline有何不同
第一个需要一段时间才能从现在开始取消,第二个需要一段绝对时间才能调用cancel,如文档中所述,这一点值得像往常一样阅读。context.WithTimeout与context.WithDeadline有何不同?-您在前面的段落中回答了自己的问题:在内部,context.WithTimeout调用context.WithDeadline函数,并通过将超时添加到当前时间来生成截止日期。如果你读了代码,你还想知道什么?
duration := 150 * time.Millisecond
// Create a context that is both manually cancellable and will signal
// a cancel at the specified duration.
ctx, cancel := context.WithTimeout(context.Background(), duration)