github.com/rolandhe/saber@v0.0.4/utils/rand/randutil.go (about)

     1  // Package randutil, rand  tool
     2  //
     3  // Copyright 2023 The saber Authors. All rights reserved.
     4  
     5  // Package randutil 使用go linkname技术暴露runtime 私有函数，以提高性能
     6  package randutil
     7  
     8  import _ "unsafe"
     9  
    10  // FastRandN 0 ~ n 范围的随机数
    11  //
    12  //go:linkname FastRandN runtime.fastrandn
    13  func FastRandN(n uint32) uint32
    14  
    15  // FastRand 生成一个64位的随机数
    16  //
    17  //go:linkname FastRand runtime.fastrand64
    18  func FastRand() uint64