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cosmopolitan/libc/intrin/cmpxchg.h

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Improve locks and signals - 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
2022-04-12 12:20:17 +00:00
#ifndef COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_H_
#define COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_H_
Fold LIBC_BITS into LIBC_INTRIN
2022-08-11 19:13:18 +00:00
#include "libc/intrin/asmflag.h"
Improve locks and signals - 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
2022-04-12 12:20:17 +00:00
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
Make progress towards aarch64 build
2023-05-02 02:43:59 +00:00
#if defined(__GNUC__) && !defined(__STRICT_ANSI__) && defined(__x86__)
Improve locks and signals - 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
2022-04-12 12:20:17 +00:00
#define _cmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME) \
({ \
bool DidIt; \
autotype(IFTHING) IfThing = (IFTHING); \
typeof(*IfThing) IsEqualToMe = (ISEQUALTOME); \
typeof(*IfThing) ReplaceItWithMe = (REPLACEITWITHME); \
asm volatile(ZFLAG_ASM("cmpxchg\t%3,%1") \
: ZFLAG_CONSTRAINT(DidIt), "+m"(*IfThing), "+a"(IsEqualToMe) \
: "r"(ReplaceItWithMe) \
: "cc"); \
DidIt; \
})
Make more threading improvements - 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
2022-11-02 05:36:03 +00:00
#else
#define _cmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME) \
(*(IFTHING) == (ISEQUALTOME) ? (*(IFTHING) = (REPLACEITWITHME), 1) : 0)
#endif
Improve locks and signals - 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
2022-04-12 12:20:17 +00:00
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_INTRIN_CMPXCHG_H_ */
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