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- /* Copyright (C) 1997-2020 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
- /* System V ABI compliant user-level context switching support. */
- #ifndef _UCONTEXT_H
- #define _UCONTEXT_H 1
- #include <features.h>
- /* Get definition of __INDIRECT_RETURN. */
- #include <bits/indirect-return.h>
- /* Get machine dependent definition of data structures. */
- #include <sys/ucontext.h>
- __BEGIN_DECLS
- /* Get user context and store it in variable pointed to by UCP. */
- extern int getcontext (ucontext_t *__ucp) __THROWNL;
- /* Set user context from information of variable pointed to by UCP. */
- extern int setcontext (const ucontext_t *__ucp) __THROWNL;
- /* Save current context in context variable pointed to by OUCP and set
- context from variable pointed to by UCP. */
- extern int swapcontext (ucontext_t *__restrict __oucp,
- const ucontext_t *__restrict __ucp)
- __THROWNL __INDIRECT_RETURN;
- /* Manipulate user context UCP to continue with calling functions FUNC
- and the ARGC-1 parameters following ARGC when the context is used
- the next time in `setcontext' or `swapcontext'.
- We cannot say anything about the parameters FUNC takes; `void'
- is as good as any other choice. */
- extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
- int __argc, ...) __THROW;
- __END_DECLS
- #endif /* ucontext.h */
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