Function ngb_mod_event

freebsd/netgraph/ng_base.c:3192–3242

* Handle loading and unloading for this code. * The only thing we need to link into is the NETISR strucure. */

 * The only thing we need to link into is the NETISR strucure.
 */
static int
ngb_mod_event(module_t mod, int event, void *data)
{
	struct proc *p;
	struct thread *td;
	int i, error = 0;

	switch (event) {
	case MOD_LOAD:
		/* Initialize everything. */
		NG_WORKLIST_LOCK_INIT();
		rw_init(&ng_typelist_lock, "netgraph types");
		rw_init(&ng_idhash_lock, "netgraph idhash");
		rw_init(&ng_namehash_lock, "netgraph namehash");
		rw_init(&ng_topo_lock, "netgraph topology mutex");
#ifdef	NETGRAPH_DEBUG
		mtx_init(&ng_nodelist_mtx, "netgraph nodelist mutex", NULL,
		    MTX_DEF);
		mtx_init(&ngq_mtx, "netgraph item list mutex", NULL,
		    MTX_DEF);
#endif
		ng_qzone = uma_zcreate("NetGraph items", sizeof(struct ng_item),
		    NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0);
		uma_zone_set_max(ng_qzone, maxalloc);
		ng_qdzone = uma_zcreate("NetGraph data items",
		    sizeof(struct ng_item), NULL, NULL, NULL, NULL,
		    UMA_ALIGN_CACHE, 0);
		uma_zone_set_max(ng_qdzone, maxdata);
		/* Autoconfigure number of threads. */
		if (numthreads <= 0)
			numthreads = mp_ncpus;
		/* Create threads. */
    		p = NULL; /* start with no process */
		for (i = 0; i < numthreads; i++) {
			if (kproc_kthread_add(ngthread, NULL, &p, &td,
			    RFHIGHPID, 0, "ng_queue", "ng_queue%d", i)) {
				numthreads = i;
				break;
			}
		}
		break;
	case MOD_UNLOAD:
		/* You can't unload it because an interface may be using it. */
		error = EBUSY;
		break;
	default:
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}

static moduledata_t netgraph_mod = {
	"netgraph",