/* Copyright (C) 1997-2018 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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<http://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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