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https://github.com/jart/cosmopolitan.git
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fec396037a
We now have a high-quality clone() implementation for creating lightweight threads on Linux/Windows/FreeBSD/NetBSD/OpenBSD.
34 lines
1.5 KiB
C
34 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_
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#define COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_
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#ifdef TINY
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#define _spinlock(lock) \
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do { \
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while (__atomic_test_and_set(lock, __ATOMIC_SEQ_CST)) { \
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__builtin_ia32_pause(); \
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} \
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} while (0)
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#else
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#define _spinlock(lock) \
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do { \
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for (;;) { \
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typeof(*(lock)) x; \
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__atomic_load(lock, &x, __ATOMIC_RELAXED); \
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if (!x && !__atomic_test_and_set(lock, __ATOMIC_SEQ_CST)) { \
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break; \
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} else { \
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__builtin_ia32_pause(); \
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} \
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} \
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} while (0)
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#endif
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#define _spunlock(lock) __atomic_clear(lock, __ATOMIC_RELAXED)
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#define _seizelock(lock) \
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do { \
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typeof(*(lock)) x = 1; \
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__atomic_store(lock, &x, __ATOMIC_SEQ_CST); \
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} while (0)
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#endif /* COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_ */
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