mirror of
https://github.com/jart/cosmopolitan.git
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933411ba99
- Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
24 lines
1.2 KiB
C
24 lines
1.2 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_
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#define COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#if (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 401 && \
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!defined(__STRICT_ANSI__)
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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, __ATOMIC_CONSUME)) { \
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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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#define _spunlock(lock) __sync_lock_release(lock)
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#endif /* GNU 4.1+ */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_ */
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