static void async_add(ErlAsync* a, AsyncQueue* q)
{
/* XXX:PaN Is this still necessary when ports lock drivers? */
if (is_internal_port(a->port)) {
ERTS_LC_ASSERT(erts_drvportid2port(a->port));
/* make sure the driver will stay around */
driver_lock_driver(internal_port_index(a->port));
}
erts_mtx_lock(&q->mtx);
if (q->len == 0) {
q->head = a;
q->tail = a;
q->len = 1;
erts_cnd_signal(&q->cv);
}
else { /* no need to signal (since the worker is working) */
a->next = q->head;
q->head->prev = a;
q->head = a;
q->len++;
}
erts_mtx_unlock(&q->mtx);
}
static erts_tse_t *async_thread_init(ErtsAsyncQ *aq)
{
ErtsThrQInit_t qinit = ERTS_THR_Q_INIT_DEFAULT;
erts_tse_t *tse = erts_tse_fetch();
#ifdef ERTS_SMP
ErtsThrPrgrCallbacks callbacks;
callbacks.arg = (void *) tse;
callbacks.wakeup = async_wakeup;
callbacks.prepare_wait = NULL;
callbacks.wait = NULL;
erts_thr_progress_register_unmanaged_thread(&callbacks);
#endif
qinit.live.queue = ERTS_THR_Q_LIVE_LONG;
qinit.live.objects = ERTS_THR_Q_LIVE_SHORT;
qinit.arg = (void *) tse;
qinit.notify = async_wakeup;
#if ERTS_USE_ASYNC_READY_Q
qinit.auto_finalize_dequeue = 0;
#endif
erts_thr_q_initialize(&aq->thr_q, &qinit);
/* Inform main thread that we are done initializing... */
erts_mtx_lock(&async->init.data.mtx);
async->init.data.no_initialized++;
erts_cnd_signal(&async->init.data.cnd);
erts_mtx_unlock(&async->init.data.mtx);
return tse;
}
