wait.h File Reference

Target-dependent wait hints. More...

#include <stddef.h>
#include <stdatomic.h>

Go to the source code of this file.

Functions
void	chic_yield (void)
	Yields the current thread execution, allowing other threads to run.
static void	busy_wait_hint (void)
	Platform-dependent hint to the processor that it is in a busy-wait loop.
static void	busy_wait_on (const void *addr)

Variables
atomic_size_t	chic_catastrophe_threshold
	Maximum number of permitted busy-wait loop iterations per send/recieve operation before the thread is yielded. Set to 1024 by default, but this can be overridden at runtime.

Detailed Description

Target-dependent wait hints.

Author

Fawn rubie.nosp@m.fawn.nosp@m.@gmai.nosp@m.l.co.nosp@m.m

Date

2026

Function Documentation

busy_wait_hint()

void busy_wait_hint ( void )

inlinestatic

Platform-dependent hint to the processor that it is in a busy-wait loop.

This helps optimize spinlocks by slowing down the processor a bit, which helps reduce contention on atomics.

See also

x86-64 pause

ARM64 isb (and why it is used instead of yield)

ARM32 yield

RISC-V pause

busy_wait_on()

void busy_wait_on ( const void * addr )

inlinestatic

See also

busy_wait_hint

RISC-V wrs

Variable Documentation

chic_catastrophe_threshold

atomic_size_t chic_catastrophe_threshold

extern

Maximum number of permitted busy-wait loop iterations per send/recieve operation before the thread is yielded. Set to 1024 by default, but this can be overridden at runtime.