github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/utils/once.go (about)

     1  /*
     2   * Copyright (C) 2017 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package utils
    19  
    20  import "sync"
    21  
    22  // CallOnce function decorator returns new function which can be called only once and is thread safe
    23  func CallOnce(f func()) func() {
    24  	once := sync.Once{}
    25  	return func() {
    26  		once.Do(f)
    27  	}
    28  }