#include <stdlib.h>#include <pthread.h>#include <stdio.h>#include <sched.h>#include <sched.h>void *consumer(void *p){      do{       printf("<<<<(%u),%d\n", (unsigned)pthread_self(), (unsigned int)p);      }while(1);}int main(int argc, char *argv[]) {         pthread_t  t1, t2, t3;        int ret;        struct sched_param param;         param.sched_priority = 1;        pthread_attr_t attr;        pthread_attr_init(&attr);                pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);         pthread_attr_setschedpolicy(&attr, SCHED_RR);        pthread_attr_setschedparam(&attr, &param);                 ret = pthread_create(&t1, NULL, consumer,(void *)1);       sleep(2);        ret = pthread_create(&t2, &attr, consumer,(void *)2);       if(ret != 0)         {               printf("create failed,%d\n", ret);                exit(1);         }         pthread_attr_destroy(&attr);        sleep(1);        printf("main returned\n");     return 0; }/*运行结果：前两秒主线程和第一个子线程交替运行，两秒后一直运行第二个子线程.*/