default math.rand.source is thread save while rand.new source is not
Default pacakge rand uses Source that is thread safe with default seed
1we can use the pacakge's method to have thread safe random number generation
package main
import (
"fmt"
"math/rand"
"time"
)
func main() {
seed := time.Now().UnixNano()
rand.Seed(seed)
fmt.Println(rand.Int63())
}
But the
rand.NewSource() offers thread unsafe implementation. One of the reason to choose the unsafe implementation to avoid synchronization, especially when you have only single go routine.package main
import (
"fmt"
"math/rand"
"time"
)
func main() {
seed := time.Now().UnixNano()
r := rand.New(rand.NewSource(seed))
fmt.Println(r.Int63())
}
Last modified 1yr ago