mirror of
https://github.com/jart/cosmopolitan.git
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046c7ebd4a
- 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
22 lines
701 B
C
22 lines
701 B
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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COSMOPOLITAN_C_START_
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/* "Place each synchronization variable alone,
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separated by 128 bytes or in a separate cache line."
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──Intel Optimization Manual §8.3.1 */
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struct cthread_spinlock_t {
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bool x;
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int owner;
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char __ignore[128 - 1 - 4];
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} forcealign(128);
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typedef struct cthread_spinlock_t cthread_spinlock_t;
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void cthread_spinlock(cthread_spinlock_t *) dontthrow;
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void cthread_spunlock(cthread_spinlock_t *) dontthrow;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_INTRIN_SPINLOCK_H_ */
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