/* Wait for a specific event */
int evt_wait(spdid_t spdid, long extern_evt)
{
struct evt *e;
while (1) {
int ret;
lock_take(&evt_lock);
e = mapping_find(extern_evt);
if (NULL == e) goto err;
if (0 > (ret = __evt_read(e))) goto err;
ACT_RECORD(ACT_WAIT, spdid, e->extern_id, cos_get_thd_id(), 0);
lock_release(&evt_lock);
if (1 == ret) {
assert(extern_evt == e->extern_id);
return 0;
} else {
ACT_RECORD(ACT_SLEEP, spdid, e->extern_id, cos_get_thd_id(), 0);
if (0 > sched_block(cos_spd_id(), 0)) BUG();
}
}
err:
lock_release(&evt_lock);
return -1;
}
int __evt_wait(spdid_t spdid, long extern_evt, int n)
{
struct evt *e;
while (1) {
int ret;
lock_take(&evt_lock);
e = mapping_find(extern_evt);
if (NULL == e) goto err;
if (0 > (ret = __evt_read(e))) goto err;
ACT_RECORD(ACT_WAIT, spdid, e->extern_id, cos_get_thd_id(), 0);
e->n_wait = n;
e->core_id = cos_cpuid();
if (ret == 1) e->n_received = 0;
lock_release(&evt_lock);
if (1 == ret) {
assert(extern_evt == e->extern_id);
return 0;
} else {
ACT_RECORD(ACT_SLEEP, spdid, e->extern_id, cos_get_thd_id(), 0);
/* We can use acaps to block / wakeup, which
* can avoid calling scheduler. But it's like
* a hack. */
if (0 > sched_block(cos_spd_id(), 0)) BUG();
}
}
err:
lock_release(&evt_lock);
return -1;
}
