github.com/minio/minio@v0.0.0-20240328213742-3f72439b8a27/internal/dsync/locked_rand.go (about)

     1  // Copyright (c) 2015-2021 MinIO, Inc.
     2  //
     3  // This file is part of MinIO Object Storage stack
     4  //
     5  // This program is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Affero General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // This program is distributed in the hope that it will be useful
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  // GNU Affero General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Affero General Public License
    16  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package dsync
    19  
    20  import (
    21  	"math/rand"
    22  	"sync"
    23  )
    24  
    25  // lockedRandSource provides protected rand source, implements rand.Source interface.
    26  type lockedRandSource struct {
    27  	lk  sync.Mutex
    28  	src rand.Source
    29  }
    30  
    31  // Int63 returns a non-negative pseudo-random 63-bit integer as an int64.
    32  func (r *lockedRandSource) Int63() (n int64) {
    33  	r.lk.Lock()
    34  	n = r.src.Int63()
    35  	r.lk.Unlock()
    36  	return
    37  }
    38  
    39  // Seed uses the provided seed value to initialize the generator to a
    40  // deterministic state.
    41  func (r *lockedRandSource) Seed(seed int64) {
    42  	r.lk.Lock()
    43  	r.src.Seed(seed)
    44  	r.lk.Unlock()
    45  }