pthread_attr_t thread_attr;
struct sched_param schedule_param;
   
pthread_attr_init(&thread_attr);
schedule_param.sched_priority = 99;
pthread_attr_setinheritsched(&thread_attr, PTHREAD_EXPLICIT_SCHED); //有这行，设置优先级才会生效
pthread_attr_setschedpolicy(&thread_attr,SCHED_RR);
pthread_attr_setschedparam(&thread_attr, &schedule_param); 

pthread_create(&workerThread, &thread_attr, WorkerThreadFunction, &param);