void
lwp_rwlock_unlock(struct lwp_rwlock *rwlock)
{
struct lwpProc *p;
int maxpri;
lwpStatus(LwpCurrent, "unlocking rwlock %s", rwlock->name);
if (CANT_HAPPEN(rwlock->count == 0))
return;
if (rwlock->count < 0)
rwlock->count = 0;
else
rwlock->count--;
if (rwlock->count == 0 && rwlock->wq.head) {
p = lwpGetFirst(&rwlock->wq);
lwpStatus(p, "wake up next writer of rwlock %s", rwlock->name);
maxpri = p->pri;
lwpReady(p);
} else if (rwlock->count >= 0 && rwlock->rq.head && !rwlock->wq.head) {
maxpri = 0;
while ((p = lwpGetFirst(&rwlock->rq))) {
lwpStatus(p, "wake up next reader of rwlock %s", rwlock->name);
maxpri = MAX(maxpri, p->pri);
lwpReady(p);
}
} else
return;
if (LwpCurrent->pri < maxpri) {
lwpStatus(LwpCurrent, "yielding to thread with higher priority");
lwpYield();
}
}
/*
* Wake up threads in LwpDelayq whose time has come.
*/
void
lwpWakeupSleep(void)
{
time_t now;
struct lwpQueue save;
struct lwpProc *proc;
if (LwpDelayq.head) {
now = time(NULL);
save.tail = save.head = NULL;
while (NULL != (proc = lwpGetFirst(&LwpDelayq))) {
if (now >= proc->runtime) {
lwpStatus(proc, "sleep done");
if (proc->runtime != 0)
proc->runtime = (time_t)-1;
if (proc->fd >= 0)
lwpWakeupFd(proc);
else
lwpReady(proc);
} else {
lwpAddTail(&save, proc);
}
}
LwpDelayq = save;
}
}