Function LIST_HEAD

freebsd/kern/kern_loginclass.c:66–94

(, loginclass)

#include <sys/systm.h>

static MALLOC_DEFINE(M_LOGINCLASS, "loginclass", "loginclass structures");

LIST_HEAD(, loginclass)	loginclasses;

/*
 * Lock protecting loginclasses list.
 */
static struct rwlock loginclasses_lock;
RW_SYSINIT(loginclasses_init, &loginclasses_lock, "loginclasses lock");

void
loginclass_hold(struct loginclass *lc)
{

	refcount_acquire(&lc->lc_refcount);
}

void
loginclass_free(struct loginclass *lc)
{

	if (refcount_release_if_not_last(&lc->lc_refcount))
		return;

	rw_wlock(&loginclasses_lock);
	if (!refcount_release(&lc->lc_refcount)) {
		rw_wunlock(&loginclasses_lock);
		return;
	}

	racct_destroy(&lc->lc_racct);
	LIST_REMOVE(lc, lc_next);