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https://github.com/jart/cosmopolitan.git
synced 2026-11-09 02:39:44 -10:00
Justine Tunney
8da931a7f6
This program popped up on Hacker News recently. It's the only modern compiler I've ever seen that doesn't have dependencies and is easily modified. So I added all of the missing GNU extensions I like to use which means it might be possible soon to build on non-Linux and have third party not vendor gcc binaries.
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
#ifndef COSMOPOLITAN_LIBC_BITS_ATOMIC_H_
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#define COSMOPOLITAN_LIBC_BITS_ATOMIC_H_
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#include "libc/bits/bits.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* @fileoverview C11 version of The Cosmopolitan Atomics Library.
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*
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* - Forty-two different ways to say MOV.
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* - Fourteen different ways to say XCHG.
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* - Twenty different ways to say LOCK CMPXCHG.
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*
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* Living proof high-level languages can be lower-level than assembly.
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*/
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#define memory_order int
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#define memory_order_relaxed 0
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#define memory_order_consume 1
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#define memory_order_acquire 2
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#define memory_order_release 3
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#define memory_order_acq_rel 4
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#define memory_order_seq_cst 5
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#define atomic_flag struct AtomicFlag
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#define atomic_flag_clear(PTR) atomic_store((PTR)->__cacheline, 0)
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#define atomic_flag_test_and_set(PTR) \
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({ \
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uint32_t ax = 0; \
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lockcmpxchg((PTR)->__cacheline, &ax, 1); \
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})
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#define atomic_init(PTR, VAL) atomic_store(PTR, VAL)
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#define atomic_exchange(PTR, VAL) lockxchg(PTR, &(VAL))
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#define atomic_compare_exchange_strong(X, Y, Z) lockcmpxchg(X, Y, Z)
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#define atomic_compare_exchange_weak(X, Y, Z) lockcmpxchg(X, Y, Z)
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#define atomic_load_explicit(PTR, ORDER) atomic_load(PTR)
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#define atomic_store_explicit(PTR, VAL, ORDER) atomic_store(PTR, VAL)
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#define atomic_flag_clear_explicit(PTR, ORDER) atomic_store(PTR, 0)
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#define atomic_exchange_explicit(PTR, VAL, ORDER) lockxchg(PTR, &(VAL))
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#define atomic_flag_test_and_set_explicit(PTR, ORDER) lockcmpxchg(PTR, 0, 1)
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#define atomic_compare_exchange_strong_explicit(X, Y, Z, S, F) \
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lockcmpxchg(X, Y, Z)
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#define atomic_compare_exchange_weak_explicit(X, Y, Z, S, F) \
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lockcmpxchg(X, Y, Z)
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struct AtomicFlag {
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uint32_t __cacheline[16]; /* Intel V.O §9.4.6 */
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} forcealign(64);
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_ATOMIC_H_ */
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