source: bootcd/isolinux/syslinux-6.03/core/thread/idle_thread.c

#include "thread.h"
#include <limits.h>
#include <sys/cpu.h>

static void default_idle_thread_hook(void)
{
}

void (*idle_thread_hook)(void) = default_idle_thread_hook;

static void idle_thread_func(void *dummy)
{
    (void)dummy;

    for (;;) {
        cli();
        idle_thread_hook();
        __schedule();
        asm volatile("sti ; hlt" : : : "memory");
    }
}

void start_idle_thread(void)
{
    start_thread("idle", 4096, IDLE_THREAD_PRIORITY, idle_thread_func, NULL);
}