Method addTask

Algorithms/threadpool.h:122–129

        return nt;
    }
    void addTask(Task *nt) {
        if (!finished) {
            pthread_mutex_lock(&qmtx);
            tasks.push(nt);
            pthread_cond_signal(&wcond);
            pthread_mutex_unlock(&qmtx);
        }
    }
    void finish() {
        pthread_mutex_lock(&qmtx);
        finished = true;