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09d179602f
This code is copied from the Linux kernel. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
#ifndef ATOMIC_H__
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#define ATOMIC_H__
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#include "types.h"
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typedef struct {
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u32 counter;
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} atomic_t;
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#define atomic_set(mem, v) \
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({ \
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u32 ret__ = v; \
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asm volatile ("lock xchg %0, %1\n" \
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: "+r" (ret__), "+m" ((mem)->counter) \
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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)->counter) \
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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)->counter) \
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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)->counter) \
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: \
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: "cc", "memory"); \
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ret__; \
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})
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/* true if the result is 0, or false for all other cases. */
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#define atomic_dec_and_test(mem) \
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({ \
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unsigned char ret__; \
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asm volatile ("lock decl %0; sete %1\n" \
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: "+m" ((mem)->counter), "=qm" (ret__) \
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: \
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: "cc", "memory"); \
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ret__ != 0; \
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})
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#endif /* ATOMIC_H__ */
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