github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/internal/fastrand/fastrand.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fastrand
    16  
    17  import _ "unsafe" // required by go:linkname
    18  
    19  // Uint32 returns a lock free uint32 value.
    20  //
    21  //go:linkname Uint32 runtime.fastrand
    22  func Uint32() uint32
    23  
    24  // Uint32n returns a lock free uint32 value in the interval [0, n).
    25  //
    26  //go:linkname Uint32n runtime.fastrandn
    27  func Uint32n(n uint32) uint32