threadpool_get
error = threadpool_get(&threadpool, PRI_NONE);
error = threadpool_get(&wg->wg_threadpool, PRI_NONE);
int threadpool_get(struct threadpool **, pri_t);
error = threadpool_get(&pool, val);
error = threadpool_get(&pool, val);
error = threadpool_get(&pool, PRI_NONE);
error = threadpool_get(&pool, PRI_NONE);
error = threadpool_get(&pool, PRI_NONE);
error = threadpool_get(&pool0, PRI_NONE);
error = threadpool_get(&pool1, PRI_NONE);
error = threadpool_get(&pool2, PRI_KERNEL_RT);