1  /* Schedule other threads to run.
       2     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file 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 Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2019.  */
      18  
      19  #include <config.h>
      20  
      21  /* Specification.  */
      22  #include <sched.h>
      23  
      24  #if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
      25  /* Use Windows threads.  */
      26  
      27  # define WIN32_LEAN_AND_MEAN  /* avoid including junk */
      28  # include <windows.h>
      29  
      30  int
      31  sched_yield (void)
      32  {
      33    Sleep (0);
      34    return 0;
      35  }
      36  
      37  #elif defined __KLIBC__
      38  /* OS/2 kLIBC implementation */
      39  
      40  # define INCL_DOS
      41  # include <os2.h>
      42  
      43  int
      44  sched_yield (void)
      45  {
      46    DosSleep (0);
      47    return 0;
      48  }
      49  
      50  #else
      51  /* Provide a dummy implementation for single-threaded applications.  */
      52  
      53  int
      54  sched_yield (void)
      55  {
      56    return 0;
      57  }
      58  
      59  #endif