lib/sched_yield.c

   1 /* Schedule other threads to run.
   2    Copyright (C) 2019-2024 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