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43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* Swap to new context.
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Copyright (C) 2008-2020 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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<https://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)
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