mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
e522aa3a07
- ASAN memory morgue is now lockless - Make C11 atomics header more portable - Rewrote pthread keys support to be lockless - Simplify Python's unicode table unpacking code - Make crash report write(2) closer to being atomic - Make it possible to strace/ftrace a single thread - ASAN now checks nul-terminated strings fast and properly - Windows fork() now restores TLS memory of calling thread
27 lines
1.4 KiB
C
27 lines
1.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_H_
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#define COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_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 _cmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME) \
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({ \
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bool DidIt; \
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autotype(IFTHING) IfThing = (IFTHING); \
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typeof(*IfThing) IsEqualToMe = (ISEQUALTOME); \
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typeof(*IfThing) ReplaceItWithMe = (REPLACEITWITHME); \
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asm volatile(ZFLAG_ASM("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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#else
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#define _cmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME) \
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(*(IFTHING) == (ISEQUALTOME) ? (*(IFTHING) = (REPLACEITWITHME), 1) : 0)
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#endif
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_H_ */
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