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17 lines
757 B
C
17 lines
757 B
C
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#ifndef COSMOPOLITAN_LIBC_BITS_LOCKXADD_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_BITS_LOCKXADD_INTERNAL_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define _lockxadd(PTR, VAL) \
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({ \
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typeof(*(PTR)) Res; \
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typeof(Res) Val = (VAL); \
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asm volatile("lock xadd\t%0,%1" : "=r"(Res), "+m"(*(PTR)) : "0"(Val)); \
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Res; /* contains *PTR before addition cf. InterlockedAdd() */ \
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})
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_LOCKXADD_INTERNAL_H_ */
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