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d614a753 | 1 | /* Copyright (C) 1997-2020 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
dfd2257a | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
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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 | ||
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25 | /* Get definition of __INDIRECT_RETURN. */ |
26 | #include <bits/indirect-return.h> | |
27 | ||
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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. */ | |
edc5984d | 34 | extern int getcontext (ucontext_t *__ucp) __THROWNL; |
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35 | |
36 | /* Set user context from information of variable pointed to by UCP. */ | |
a784e502 | 37 | extern int setcontext (const ucontext_t *__ucp) __THROWNL; |
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38 | |
39 | /* Save current context in context variable pointed to by OUCP and set | |
40 | context from variable pointed to by UCP. */ | |
98cbe360 | 41 | extern int swapcontext (ucontext_t *__restrict __oucp, |
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42 | const ucontext_t *__restrict __ucp) |
43 | __THROWNL __INDIRECT_RETURN; | |
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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. */ | |
c1422e5b | 51 | extern void makecontext (ucontext_t *__ucp, void (*__func) (void), |
57769839 | 52 | int __argc, ...) __THROW; |
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53 | |
54 | __END_DECLS | |
55 | ||
56 | #endif /* ucontext.h */ |