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Use CLK_TCK for clock_nanosleep() spin threshold

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This more accurately reflects how the kernels actually implement this
function and it most importantly avoids incurring startup latency.
This commit is contained in:
Justine Tunney 2023-10-03 16:58:42 -07:00
parent 11c18fa644
commit 695f74035d
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GPG key ID: BE714B4575D6E328
4 changed files with 108 additions and 55 deletions
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16
libc/nexgen32e/yield.h Normal file
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@ -0,0 +1,16 @@
#ifndef COSMOPOLITAN_LIBC_YIELD_H_
#define COSMOPOLITAN_LIBC_YIELD_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
#ifdef _COSMO_SOURCE
static inline void spin_yield(void) {
#if defined(__GNUC__) && defined(__aarch64__)
__asm__ volatile("yield");
#elif defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))
__asm__ volatile("pause");
#endif
}
#endif /* _COSMO_SOURCE */
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_YIELD_H_ */