在Linux上以root用户身份调用SCHED_FIFO线程的pthread_create()时获取EPERM

@H_301_8@

我已经删除了将一个线程创建到一个只执行该操作的小程序中的代码.它看起来对我来说,但仍然得到错误.我究竟做错了什么？@H_301_8@

该程序：@H_301_8@

@H_301_8@

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

static void *_Thread(void *arg)
{
    (void)arg;
    printf("Thread running!\n");
    return NULL;
}

int main(void)
{
    int retVal;
    pthread_attr_t attr;
    struct sched_param schedParam;
    pthread_t thread;

    retVal = pthread_attr_init(&attr);
    if (retVal)
    {
        fprintf(stderr,"pthread_attr_init error %d\n",retVal);
        exit(1);
    }

    retVal = pthread_attr_seTinheritsched(&attr,PTHREAD_EXPLICIT_scheD);
    if (retVal)
    {
        fprintf(stderr,"pthread_attr_seTinheritsched error %d\n",retVal);
        exit(1);
    }

    retVal = pthread_attr_setschedpolicy(&attr,scheD_FIFO);
    if (retVal)
    {
        fprintf(stderr,"pthread_attr_setschedpolicy error %d\n",retVal);
        exit(1);
    }

    schedParam.sched_priority = 1;
    retVal = pthread_attr_setschedparam(&attr,&schedParam);
    if (retVal)
    {
        fprintf(stderr,"pthread_attr_setschedparam error %d\n",retVal);
        exit(1);
    }

    retVal = pthread_create(&thread,&attr,_Thread,null);
    if (retVal)
    {
        fprintf(stderr,"pthread_create error %d\n",retVal);
        exit(1);
    }

    retVal = pthread_join(thread,"pthread_join error %d\n",retVal);
        exit(1);
    }

    printf("main run successfully\n");
    return 0;
}

该程序已编译并以root身份运行.运行时,程序在调用pthread_create时失败,返回EPERm.@H_301_8@

将线程更改为scheD_RR调度没有任何效果 – 仍然由pthread_create返回EPERm.@H_301_8@

将线程更改为scheD_OTHER调度并将其优先级更改为0允许程序无错误地运行.@H_301_8@