static void schedule(struct thread *t)
{
struct thread *current = current_thread();
/* If t is NULL need to find new runnable thread. */
if (t == NULL) {
if (thread_list_empty(&runnable_threads))
die("Runnable thread list is empty!\n");
t = pop_runnable();
} else {
/* current is still runnable. */
push_runnable(current);
}
switch_to_thread(t->stack_current, ¤t->stack_current);
}
void tasklet_service::yield(tasklet& tasklet_)
{
if(_stop)
{
throw stop_exception();
}
if (empty_runnables())
{
return;
}
push_runnable(tasklet_);
assert(!empty_runnables());
tasklet& next = pop_runnable();
switch_tasklet(tasklet_, next);
}
static void idle_thread_init(void)
{
struct thread *t;
t = get_free_thread();
if (t == NULL)
die("No threads available for idle thread!\n");
/* Queue idle thread to run once all other threads have yielded. */
prepare_thread(t, idle_thread, NULL, call_wrapper, NULL);
push_runnable(t);
/* Mark the currently executing thread to cooperate. */
thread_cooperate();
}
bool tasklet_service::check_waittings()
{
if (_head_waittings == NULL)
{
assert(_tail_waittings == NULL);
return false;
}
bool found = false;
for (tasklet *it = _head_waittings; it != NULL;)
{
tasklet *next = it->_next_waitting;
if (!_channel_manager.empty(it->_channel))
{
unpark(*it);
push_runnable(*it);
//这里是不是需要notify或者notify_all一下其他等待的threadlet呢？
found = true;
}
it = next;
}
return found;
}