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/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   The GNU C Library 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
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */
 
/* System V ABI compliant user-level context switching support.  */
 
#ifndef _UCONTEXT_H
#define _UCONTEXT_H	1
 
#include <features.h>
 
/* Get machine dependent definition of data structures.  */
#include <sys/ucontext.h>
 
__BEGIN_DECLS
 
/* Get user context and store it in variable pointed to by UCP.  */
extern int getcontext (ucontext_t *__ucp) __THROW;
 
/* Set user context from information of variable pointed to by UCP.  */
extern int setcontext (__const ucontext_t *__ucp) __THROW;
 
/* Save current context in context variable pointed to by OUCP and set
   context from variable pointed to by UCP.  */
extern int swapcontext (ucontext_t *__restrict __oucp,
			__const ucontext_t *__restrict __ucp) __THROW;
 
/* Manipulate user context UCP to continue with calling functions FUNC
   and the ARGC-1 parameters following ARGC when the context is used
   the next time in `setcontext' or `swapcontext'.
 
   We cannot say anything about the parameters FUNC takes; `void'
   is as good as any other choice.  */
extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
			 int __argc, ...) __THROW;
 
__END_DECLS
 
#endif /* ucontext.h */