/* Copyright (C) 1997-2018 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, see
<http://www.gnu.org/licenses/>. */

/* System V ABI compliant user-level context switching support. */

#ifndef _UCONTEXT_H
#define _UCONTEXT_H 1

#include <features.h>

/* Get definition of __INDIRECT_RETURN. */
#include <bits/indirect-return.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) __THROWNL;

/* Set user context from information of variable pointed to by UCP. */
extern int setcontext (const ucontext_t *__ucp) __THROWNL;

/* 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)
__THROWNL __INDIRECT_RETURN;

/* 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 */