1 | /* Copyright (C) 1997-2018 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. */ |
31 | extern int getcontext (ucontext_t *__ucp) __THROWNL; |
32 | |
33 | /* Set user context from information of variable pointed to by UCP. */ |
34 | extern 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. */ |
38 | extern 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. */ |
47 | extern void makecontext (ucontext_t *__ucp, void (*__func) (void), |
48 | int __argc, ...) __THROW; |
49 | |
50 | __END_DECLS |
51 | |
52 | #endif /* ucontext.h */ |
53 | |