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24 lines
1.3 KiB
C
24 lines
1.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHGP_H_
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#define COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHGP_H_
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#include "libc/intrin/asmflag.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__) && defined(__x86__)
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#define _lockcmpxchgp(IN_OUT_IFTHING, IN_OUT_ISEQUALTOME, IN_REPLACEITWITHME) \
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({ \
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bool DidIt; \
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autotype(IN_OUT_IFTHING) IfThing = (IN_OUT_IFTHING); \
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typeof(IfThing) IsEqualToMe = (IN_OUT_ISEQUALTOME); \
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typeof(*IfThing) ReplaceItWithMe = (IN_REPLACEITWITHME); \
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asm volatile(ZFLAG_ASM("lock cmpxchg\t%3,%1") \
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: ZFLAG_CONSTRAINT(DidIt), "+m"(*IfThing), "+a"(*IsEqualToMe) \
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: "r"(ReplaceItWithMe) \
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: "cc"); \
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DidIt; \
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})
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#endif /* GNUC && !ANSI && x86 */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHGP_H_ */
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