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https://github.com/checkpoint-restore/criu.git
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fd7543e6e5
Based-on-patch-from: Andrey Vagin <avagin@openvz.org> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Andrey Vagin <avagin@openvz.org>
44 lines
836 B
C
44 lines
836 B
C
#ifndef ATOMIC_H__
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#define ATOMIC_H__
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#include "types.h"
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#define atomic_set(mem, v) \
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({ \
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asm volatile ("lock xchg %0, %1\n" \
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: "+r" (v), "+m" (*mem) \
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: \
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: "cc", "memory"); \
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})
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#define atomic_get(mem) \
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({ \
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u32 ret__ = 0; \
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asm volatile ("lock xadd %0, %1\n" \
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: "+r" (ret__), "+m" (*mem) \
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: \
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: "cc", "memory"); \
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ret__; \
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})
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#define atomic_inc(mem) \
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({ \
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u32 ret__ = 1; \
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asm volatile ("lock xadd %0, %1\n" \
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: "+r" (ret__), "+m" (*mem) \
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: \
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: "cc", "memory"); \
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ret__; \
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})
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#define atomic_dec(mem) \
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({ \
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u32 ret__ = -1; \
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asm volatile ("lock xadd %0, %1\n" \
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: "+r" (ret__), "+m" (*mem) \
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: \
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: "cc", "memory"); \
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ret__; \
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})
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#endif /* ATOMIC_H__ */
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