| 1 | /* Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 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 |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* System V ABI compliant user-level context switching support. */ |
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| 19 | |
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| 20 | #ifndef _UCONTEXT_H |
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| 21 | #define _UCONTEXT_H 1 |
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| 22 | |
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| 23 | #include <features.h> |
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| 24 | |
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| 25 | /* Get definition of __INDIRECT_RETURN. */ |
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| 26 | #include <bits/indirect-return.h> |
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| 27 | |
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| 28 | /* Get machine dependent definition of data structures. */ |
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| 29 | #include <sys/ucontext.h> |
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| 30 | |
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| 31 | __BEGIN_DECLS |
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| 32 | |
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| 33 | /* Get user context and store it in variable pointed to by UCP. */ |
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| 34 | extern int getcontext (ucontext_t *__ucp) __THROWNL; |
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| 35 | |
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| 36 | /* Set user context from information of variable pointed to by UCP. */ |
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| 37 | extern int setcontext (const ucontext_t *__ucp) __THROWNL; |
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| 38 | |
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| 39 | /* Save current context in context variable pointed to by OUCP and set |
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| 40 | context from variable pointed to by UCP. */ |
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| 41 | extern int swapcontext (ucontext_t *__restrict __oucp, |
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| 42 | const ucontext_t *__restrict __ucp) |
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| 43 | __THROWNL __INDIRECT_RETURN; |
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| 44 | |
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| 45 | /* Manipulate user context UCP to continue with calling functions FUNC |
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| 46 | and the ARGC-1 parameters following ARGC when the context is used |
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| 47 | the next time in `setcontext' or `swapcontext'. |
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| 48 | |
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| 49 | We cannot say anything about the parameters FUNC takes; `void' |
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| 50 | is as good as any other choice. */ |
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| 51 | extern void makecontext (ucontext_t *__ucp, void (*__func) (void), |
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| 52 | int __argc, ...) __THROW; |
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| 53 | |
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| 54 | __END_DECLS |
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| 55 | |
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| 56 | #endif /* ucontext.h */ |
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| 57 | |
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