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1 | /* Copyright (C) 1997-2019 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 | <https://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 definition of __INDIRECT_RETURN. */ | |
26 | #include <bits/indirect-return.h> | |
27 | ||
28 | /* Get machine dependent definition of data structures. */ | |
29 | #include <sys/ucontext.h> | |
30 | ||
31 | __BEGIN_DECLS | |
32 | ||
33 | /* Get user context and store it in variable pointed to by UCP. */ | |
34 | extern int getcontext (ucontext_t *__ucp) __THROWNL; | |
35 | ||
36 | /* Set user context from information of variable pointed to by UCP. */ | |
37 | extern int setcontext (const ucontext_t *__ucp) __THROWNL; | |
38 | ||
39 | /* Save current context in context variable pointed to by OUCP and set | |
40 | context from variable pointed to by UCP. */ | |
41 | extern int swapcontext (ucontext_t *__restrict __oucp, | |
42 | const ucontext_t *__restrict __ucp) | |
43 | __THROWNL __INDIRECT_RETURN; | |
44 | ||
45 | /* Manipulate user context UCP to continue with calling functions FUNC | |
46 | and the ARGC-1 parameters following ARGC when the context is used | |
47 | the next time in `setcontext' or `swapcontext'. | |
48 | ||
49 | We cannot say anything about the parameters FUNC takes; `void' | |
50 | is as good as any other choice. */ | |
51 | extern void makecontext (ucontext_t *__ucp, void (*__func) (void), | |
52 | int __argc, ...) __THROW; | |
53 | ||
54 | __END_DECLS | |
55 | ||
56 | #endif /* ucontext.h */ |