If I run below example on Windows I will quickly hit TCP connection limit (which I set to 64k) and get error: dial tcp 127.0.0.1:3306: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.
I see all this TIME_WAIT
states waiting for there lifetime to end with: netstat -ano|findstr 3306
Why aren't connections closed immediately?
The code:
package main
import (
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
"log"
"sync"
)
var (
db_instance *sqlx.DB
wg sync.WaitGroup
)
func main() {
db, err := sqlx.Connect("mysql", "user:pass@/table")
if err != nil {
log.Fatalln(err)
}
defer db.Close()
db_instance = db
for {
for l := 0; l < 50; l++ {
wg.Add(1)
go DB_TEST()
}
wg.Wait()
}
}
func DB_TEST() {
defer wg.Done()
var s string
err := db_instance.QueryRow("SELECT NOW()").Scan(&s)
if err != nil {
log.Println(err)
return
}
log.Println(s)
}