1 files changed, 59 insertions, 0 deletions
diff --git a/src/gl/tests/sched_yield.c b/src/gl/tests/sched_yield.c
new file mode 100644
index 0000000..ae0e936
--- /dev/null
+++ b/src/gl/tests/sched_yield.c
@@ -0,0 +1,59 @@
+/* Schedule other threads to run.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2019.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <sched.h>
+
+#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
+/* Use Windows threads.  */
+
+# define WIN32_LEAN_AND_MEAN  /* avoid including junk */
+# include <windows.h>
+
+int
+sched_yield (void)
+{
+  Sleep (0);
+  return 0;
+}
+
+#elif defined __KLIBC__
+/* OS/2 kLIBC implementation */
+
+# define INCL_DOS
+# include <os2.h>
+
+int
+sched_yield (void)
+{
+  DosSleep (0);
+  return 0;
+}
+
+#else
+/* Provide a dummy implementation for single-threaded applications.  */
+
+int
+sched_yield (void)
+{
+  return 0;
+}
+
+#endif