37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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/*
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* Atomic ops
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* Copyright (C) 2008 Andreas Öman
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef HTSATOMIC_H__
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#define HTSATOMIC_H__
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/**
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* Atomically add 'incr' to *ptr and return the previous value
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*/
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#if defined(__i386__) || defined(__x86_64__)
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static inline int
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atomic_add(volatile int *ptr, int incr)
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{
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int r;
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asm volatile("lock; xaddl %0, %1" :
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"=r"(r), "=m"(*ptr) : "0" (incr), "m" (*ptr) : "memory");
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return r;
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}
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#endif
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#endif /* HTSATOMIC_H__ */
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