cv_status::cv_status wait_for(unique_lock<mutex>& lock,
const chrono::duration<RepT, PeriodT>& d)
{
// First enqueue ourselves in the list of waiters.
WaitingThread w;
enqueue(w);
// We can only unlock the lock when we are sure that a signal will
// reach our thread.
detail::lock_releaser<unique_lock<mutex> > releaser(lock);
// Wait until we receive a signal, then re-lock the lock.
bool gotSignal = w.signal.try_wait_for(d);
// If we have received a signal, we have _always_ been dequeued.
// If the other case, we might have been dequeued or might have
// been not. In that case, we have to check the dequeued flag.
if (!gotSignal)
{
maybeDequeue(w);
return cv_status::timeout;
}
return cv_status::no_timeout;
}
void AsyncIOQueue::onCompleted(AsyncIOOp* op) {
maybeDequeue();
}
void AsyncIOQueue::submit(OpFactory op) {
queue_.push_back(op);
maybeDequeue();
}