Blame sysdeps/unix/sysv/linux/hppa/swapcontext.c

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/* Swap to new context.
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   Copyright (C) 2008-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Helge Deller <deller@gmx.de>, 2008.
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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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#include <ucontext.h>
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extern int __getcontext (ucontext_t *ucp);
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extern int __setcontext (const ucontext_t *ucp);
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int
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__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
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{
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  /* Save the current machine context to oucp.  */
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  __getcontext (oucp);
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  /* mark sc_sar flag to skip the setcontext call on reactivation.  */
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  if (oucp->uc_mcontext.sc_sar == 0) {
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	oucp->uc_mcontext.sc_sar++;
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	/* Restore the machine context in ucp.  */
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	__setcontext (ucp);
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  }
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  return 0;
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}
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weak_alias (__swapcontext, swapcontext)