Function acct_thread

freebsd/kern/kern_acct.c:617–659

* The main loop for the dedicated kernel thread that periodically calls * acctwatch(). */

 * acctwatch().
 */
static void
acct_thread(void *dummy)
{
	u_char pri;

	/* This is a low-priority kernel thread. */
	pri = PRI_MAX_KERN;
	thread_lock(curthread);
	sched_prio(curthread, pri);
	thread_unlock(curthread);

	/* If another accounting kthread is already running, just die. */
	sx_xlock(&acct_sx);
	if (acct_state & ACCT_RUNNING) {
		sx_xunlock(&acct_sx);
		kproc_exit(0);
	}
	acct_state |= ACCT_RUNNING;

	/* Loop until we are asked to exit. */
	while (!(acct_state & ACCT_EXITREQ)) {
		/* Perform our periodic checks. */
		acctwatch();

		/*
		 * We check this flag again before sleeping since the
		 * acctwatch() might have shut down accounting and asked us
		 * to exit.
		 */
		if (!(acct_state & ACCT_EXITREQ)) {
			sx_sleep(&acct_state, &acct_sx, 0, "-",
			    acctchkfreq * hz);
		}
	}

	/*
	 * Acknowledge the exit request and shutdown.  We clear both the
	 * exit request and running flags.
	 */
	acct_state = 0;
	sx_xunlock(&acct_sx);
	kproc_exit(0);
}