/
ConcurrentRandom.cs
60 lines (51 loc) · 1.87 KB
/
ConcurrentRandom.cs
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// --------------------------------------------------------------------------
// Copyright (c) 2014 Will Perry, Microsoft
//
// 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.
// --------------------------------------------------------------------------
namespace WillPe.Utils
{
using System;
public static class ConcurrentRandom
{
private static readonly Random SeedGenerator = new Random();
[ThreadStatic]
private static Random random;
public static int Next(int minValue, int maxValue)
{
if (ConcurrentRandom.random == null)
{
int seed;
lock (ConcurrentRandom.SeedGenerator)
{
seed = ConcurrentRandom.SeedGenerator.Next();
}
ConcurrentRandom.random = new Random(seed);
}
return ConcurrentRandom.random.Next(minValue, maxValue);
}
public static double NextDouble()
{
if (ConcurrentRandom.random == null)
{
int seed;
lock (ConcurrentRandom.SeedGenerator)
{
seed = ConcurrentRandom.SeedGenerator.Next();
}
ConcurrentRandom.random = new Random(seed);
}
return ConcurrentRandom.random.NextDouble();
}
}
}