| // 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() |
| } |