41 lines
1012 B
Go
41 lines
1012 B
Go
|
// Copyright 2020 The gVisor Authors.
|
||
|
//
|
||
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
// you may not use this file except in compliance with the License.
|
||
|
// You may obtain a copy of the License at
|
||
|
//
|
||
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
//
|
||
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
// See the License for the specific language governing permissions and
|
||
|
// limitations under the License.
|
||
|
|
||
|
package stack
|
||
|
|
||
|
import (
|
||
|
mathrand "math/rand"
|
||
|
|
||
|
"gvisor.dev/gvisor/pkg/sync"
|
||
|
)
|
||
|
|
||
|
// lockedRandomSource provides a threadsafe rand.Source.
|
||
|
type lockedRandomSource struct {
|
||
|
mu sync.Mutex
|
||
|
src mathrand.Source
|
||
|
}
|
||
|
|
||
|
func (r *lockedRandomSource) Int63() (n int64) {
|
||
|
r.mu.Lock()
|
||
|
n = r.src.Int63()
|
||
|
r.mu.Unlock()
|
||
|
return n
|
||
|
}
|
||
|
|
||
|
func (r *lockedRandomSource) Seed(seed int64) {
|
||
|
r.mu.Lock()
|
||
|
r.src.Seed(seed)
|
||
|
r.mu.Unlock()
|
||
|
}
|