mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
34 lines
568 B
Go
34 lines
568 B
Go
package random
|
|
|
|
import (
|
|
"math/rand"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// copypaste from standard math/rand
|
|
type lockedSource struct {
|
|
lk sync.Mutex
|
|
src rand.Source
|
|
}
|
|
|
|
func (r *lockedSource) Int63() (n int64) {
|
|
r.lk.Lock()
|
|
n = r.src.Int63()
|
|
r.lk.Unlock()
|
|
return
|
|
}
|
|
|
|
func (r *lockedSource) Seed(seed int64) {
|
|
r.lk.Lock()
|
|
r.src.Seed(seed)
|
|
r.lk.Unlock()
|
|
}
|
|
|
|
// NewSource returns math/rand.Source safe for concurrent use and initialized
|
|
// with current unix-nano timestamp
|
|
func NewSource() rand.Source {
|
|
return &lockedSource{
|
|
src: rand.NewSource(time.Now().UnixNano()),
|
|
}
|
|
}
|