mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
046c7ebd4a
- Introduce fast spinlock API - Double rand64() perf w/ spinlock - Improve raise() on New Technology - Support gettid() across platforms - Implement SA_NODEFER on New Technology - Move the lock intrinsics into LIBC_INTRIN - Make SIGTRAP recoverable on New Technology - Block SIGCHLD in wait4() on New Technology - Add threading prototypes for XNU and FreeBSD - Rewrite abort() fixing its minor bugs on XNU/NT - Shave down a lot of the content in libc/bits/bits.h - Let signal handlers modify CPU registers on New Technology
29 lines
1.4 KiB
C
29 lines
1.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHG_H_
|
|
#define COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHG_H_
|
|
#include "libc/bits/asmflag.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
bool _lockcmpxchg(void *, intptr_t, intptr_t, size_t);
|
|
|
|
#if defined(__GNUC__) && !defined(__STRICT_ANSI__) && defined(__x86__)
|
|
#define _lockcmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME) \
|
|
({ \
|
|
bool DidIt; \
|
|
autotype(IFTHING) IfThing = (IFTHING); \
|
|
typeof(*IfThing) IsEqualToMe = (ISEQUALTOME); \
|
|
typeof(*IfThing) ReplaceItWithMe = (REPLACEITWITHME); \
|
|
asm volatile(ZFLAG_ASM("lock cmpxchg\t%3,%1") \
|
|
: ZFLAG_CONSTRAINT(DidIt), "+m"(*IfThing), "+a"(IsEqualToMe) \
|
|
: "r"(ReplaceItWithMe) \
|
|
: "cc"); \
|
|
DidIt; \
|
|
})
|
|
#else
|
|
#define _lockcmpxchg(MEM, CMP, VAL) \
|
|
_lockcmpxchg(MEM, (intptr_t)(CMP), (intptr_t)(VAL), sizeof(*(MEM)))
|
|
#endif /* GNUC && !ANSI && x86 */
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_LIBC_INTRIN_LOCKCMPXCHG_H_ */
|