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56 lines
1.3 KiB
56 lines
1.3 KiB
/* |
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* |
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* Copyright 2018 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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// Package grpcrand implements math/rand functions in a concurrent-safe way |
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// with a global random source, independent of math/rand's global source. |
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package grpcrand |
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import ( |
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"math/rand" |
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"sync" |
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"time" |
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) |
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var ( |
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r = rand.New(rand.NewSource(time.Now().UnixNano())) |
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mu sync.Mutex |
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) |
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// Int63n implements rand.Int63n on the grpcrand global source. |
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func Int63n(n int64) int64 { |
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mu.Lock() |
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res := r.Int63n(n) |
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mu.Unlock() |
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return res |
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} |
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// Intn implements rand.Intn on the grpcrand global source. |
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func Intn(n int) int { |
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mu.Lock() |
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res := r.Intn(n) |
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mu.Unlock() |
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return res |
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} |
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// Float64 implements rand.Float64 on the grpcrand global source. |
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func Float64() float64 { |
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mu.Lock() |
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res := r.Float64() |
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mu.Unlock() |
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return res |
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}
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