bool wait(duration_t* timeout) {
std::unique_lock<std::mutex> guard(mutex);
queue_lock->unlock();
std::cv_status res = std::cv_status::no_timeout;
if(timeout) {
auto start = std::chrono::system_clock::now();
res = ready.wait_for(guard, *timeout);
*timeout -= (std::chrono::system_clock::now() - start);
} else {
ready.wait(guard);
}
guard.unlock();
queue_lock->lock();
return res == std::cv_status::no_timeout;
}
void before_switch_to() {
lock->lock();
}