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/* Yielding the processor to other threads and processes.
Copyright (C) 2005-2018 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/>. */
/* This file contains a primitive for yielding the processor to other threads.
extern void gl_thread_yield (void);
*/
#ifndef _GLTHREAD_YIELD_H
#define _GLTHREAD_YIELD_H
#include <errno.h>
/* ========================================================================= */
#if USE_POSIX_THREADS
/* Use the POSIX threads library. */
# include <sched.h>
# ifdef __cplusplus
extern "C" {
# endif
# define gl_thread_yield() \
sched_yield ()
# ifdef __cplusplus
}
# endif
#endif
/* ========================================================================= */
#if USE_PTH_THREADS
/* Use the GNU Pth threads library. */
# include <pth.h>
# ifdef __cplusplus
extern "C" {
# endif
# define gl_thread_yield() \
pth_yield (NULL)
# ifdef __cplusplus
}
# endif
#endif
/* ========================================================================= */
#if USE_SOLARIS_THREADS
/* Use the old Solaris threads library. */
# include <thread.h>
# ifdef __cplusplus
extern "C" {
# endif
# define gl_thread_yield() \
thr_yield ()
# ifdef __cplusplus
}
# endif
#endif
/* ========================================================================= */
#if USE_WINDOWS_THREADS
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
# ifdef __cplusplus
extern "C" {
# endif
# define gl_thread_yield() \
Sleep (0)
# ifdef __cplusplus
}
# endif
#endif
/* ========================================================================= */
#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WINDOWS_THREADS)
/* Provide dummy implementation if threads are not supported. */
# define gl_thread_yield() 0
#endif
/* ========================================================================= */
#endif /* _GLTHREAD_YIELD_H */
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