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// 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()
}
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