1/* Copyright (C) 1997-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18/* System V ABI compliant user-level context switching support. */
19
20#ifndef _UCONTEXT_H
21#define _UCONTEXT_H 1
22
23#include <features.h>
24
25/* Get machine dependent definition of data structures. */
26#include <sys/ucontext.h>
27
28__BEGIN_DECLS
29
30/* Get user context and store it in variable pointed to by UCP. */
31extern int getcontext (ucontext_t *__ucp) __THROWNL;
32
33/* Set user context from information of variable pointed to by UCP. */
34extern int setcontext (const ucontext_t *__ucp) __THROWNL;
35
36/* Save current context in context variable pointed to by OUCP and set
37 context from variable pointed to by UCP. */
38extern int swapcontext (ucontext_t *__restrict __oucp,
39 const ucontext_t *__restrict __ucp) __THROWNL;
40
41/* Manipulate user context UCP to continue with calling functions FUNC
42 and the ARGC-1 parameters following ARGC when the context is used
43 the next time in `setcontext' or `swapcontext'.
44
45 We cannot say anything about the parameters FUNC takes; `void'
46 is as good as any other choice. */
47extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
48 int __argc, ...) __THROW;
49
50__END_DECLS
51
52#endif /* ucontext.h */
53