kinetic-c
v0.12.0
Seagate Kinetic Protocol Client Library for C
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atomic.h
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/*
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* kinetic-c
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* Copyright (C) 2015 Seagate Technology.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef ATOMIC_H
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#define ATOMIC_H
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/* Compiler intrinsic for an atomic compare-and-swap.
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* Returns true if *PTR has been atomically changed from
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* OLD to NEW, or false if OLD is no longer the current value
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* (typically, because another thread changed it first). */
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#define ATOMIC_BOOL_COMPARE_AND_SWAP(PTR, OLD, NEW) \
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(__sync_bool_compare_and_swap(PTR, OLD, NEW))
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/* Spin attempting to atomically adjust F by ADJ until successful */
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#define SPIN_ADJ(F, ADJ) \
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do { \
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for (;;) { \
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size_t v = F; \
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if (ATOMIC_BOOL_COMPARE_AND_SWAP(&F, v, v + ADJ)) { \
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break; \
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} \
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} \
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} while (0)
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#endif
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