gitea/vendor/github.com/go-redis/redis/v8/internal/rand/rand.go

46 lines
1.1 KiB
Go

package rand
import (
"math/rand"
"sync"
)
// Int returns a non-negative pseudo-random int.
func Int() int { return pseudo.Int() }
// Intn returns, as an int, a non-negative pseudo-random number in [0,n).
// It panics if n <= 0.
func Intn(n int) int { return pseudo.Intn(n) }
// Int63n returns, as an int64, a non-negative pseudo-random number in [0,n).
// It panics if n <= 0.
func Int63n(n int64) int64 { return pseudo.Int63n(n) }
// Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n).
func Perm(n int) []int { return pseudo.Perm(n) }
// Seed uses the provided seed value to initialize the default Source to a
// deterministic state. If Seed is not called, the generator behaves as if
// seeded by Seed(1).
func Seed(n int64) { pseudo.Seed(n) }
var pseudo = rand.New(&source{src: rand.NewSource(1)})
type source struct {
src rand.Source
mu sync.Mutex
}
func (s *source) Int63() int64 {
s.mu.Lock()
n := s.src.Int63()
s.mu.Unlock()
return n
}
func (s *source) Seed(seed int64) {
s.mu.Lock()
s.src.Seed(seed)
s.mu.Unlock()
}