50 lines
1.8 KiB
C
Executable File
50 lines
1.8 KiB
C
Executable File
/* Simple atomic operations for multithreading.
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Copyright (C) 2021-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2021. */
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#ifndef _SIMPLE_ATOMIC_H
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#define _SIMPLE_ATOMIC_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Guarantees that memory stores that are in code before this call
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are finished before this call, and that memory loads that are in code
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after this call are started after this call. */
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extern void memory_barrier (void);
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/* Stores NEWVAL in *VP if the old value *VP is == CMP.
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Returns the old value. */
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extern unsigned int atomic_compare_and_swap (unsigned int volatile *vp,
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unsigned int cmp,
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unsigned int newval);
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/* Stores NEWVAL in *VP if the old value *VP is == CMP.
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Returns the old value. */
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extern uintptr_t atomic_compare_and_swap_ptr (uintptr_t volatile *vp,
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uintptr_t cmp,
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uintptr_t newval);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SIMPLE_ATOMIC_H */
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