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https://github.com/jart/cosmopolitan.git
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ae638c0850
- Get clone() working on FreeBSD - Increase some Python build quotas - Add more atomic builtins to chibicc - Fix ASAN poisoning of alloca() memory - Make MODE= mandatory link path tinier - Improve the examples folder a little bit - Start working on some more resource limits - Make the linenoise auto-complete UI as good as GNU readline - Update compile.com, avoiding AVX codegen on non-AVX systems - Make sure empty path to syscalls like opendir raises ENOENT - Correctly polyfill ENOENT vs. ENOTDIR on the New Technology - Port bestline's paredit features to //third_party/linenoise - Remove workarounds for RHEL 5.0 bugs that were fixed in 5.1
28 lines
1.1 KiB
C
28 lines
1.1 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 (__sync_lock_test_and_set(lock, 1)) { \
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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 && !__sync_lock_test_and_set(lock, 1)) { \
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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) __sync_lock_release(lock)
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#endif /* COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_ */
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