/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* System V ABI compliant user-level context switching support. */
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#ifndef _UCONTEXT_H
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#define _UCONTEXT_H 1
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#include <features.h>
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/* Get definition of __INDIRECT_RETURN. */
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#include <bits/indirect-return.h>
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/* Get machine dependent definition of data structures. */
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#include <sys/ucontext.h>
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__BEGIN_DECLS
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/* Get user context and store it in variable pointed to by UCP. */
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extern int getcontext (ucontext_t *__ucp) __THROWNL;
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/* Set user context from information of variable pointed to by UCP. */
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extern int setcontext (const ucontext_t *__ucp) __THROWNL;
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/* Save current context in context variable pointed to by OUCP and set
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context from variable pointed to by UCP. */
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extern int swapcontext (ucontext_t *__restrict __oucp,
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const ucontext_t *__restrict __ucp)
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__THROWNL __INDIRECT_RETURN;
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/* Manipulate user context UCP to continue with calling functions FUNC
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and the ARGC-1 parameters following ARGC when the context is used
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the next time in `setcontext' or `swapcontext'.
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We cannot say anything about the parameters FUNC takes; `void'
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is as good as any other choice. */
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extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
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int __argc, ...) __THROW;
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__END_DECLS
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#endif /* ucontext.h */
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