cgroup&多线程测试

C代码：thread.c

#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>
#include <unistd.h> 
/* 声明结构体 */
struct member
{
    int num;
    char *name;
};     

/* 定义线程pthread */
static void * pthread(void *arg)       
{
    struct member *temp;
    
    /* 线程pthread开始运行 */
    printf("pthread start!\n");
    while(1){
    ;
    }
    /* 令主线程继续执行 */
    sleep(2);
    
    /* 打印传入参数 */
    temp = (struct member *)arg;      
    printf("member->num:%d\n",temp->num);
    printf("member->name:%s\n",temp->name);
    
    return NULL;
}

/* main函数 */
int main(int agrc,char* argv[])
{
    pthread_t tidp,tidp1;
    struct member *b;

    /* 为结构体变量b赋值 */
    b = (struct member *)malloc(sizeof(struct member));           
    b->num=1;
    b->name="mlq";              

    /* 创建线程pthread */
    if ((pthread_create(&tidp, NULL, pthread, (void*)b)) == -1)
    {
        printf("create error!\n");
        return 1;
    }
    if ((pthread_create(&tidp1, NULL, pthread, (void*)b)) == -1)
    {
        printf("create error!\n");
        return 1;
    }

    /* 令线程pthread先运行 */
    sleep(1);
    
    /* 线程pthread睡眠2s，此时main可以先执行 */
    printf("main continue!\n");
    
    /* 等待线程pthread释放 */
    if (pthread_join(tidp, NULL))                  
    {
        printf("thread is not exit...\n");
        return -2;
    }
    
    return 0;
}

编译

gcc -o thread.out thread.c -lpthread

测试

1、systemd-run --unit=threadtest --slice=test /root/thread.out 会启动一个临时服务,该服务就是运行/root/thread.out，名为threadtest.service
2、查看top -H -p <threadtest.service的pid>会显示该服务及其线程的信息
3、cgroup：/sys/fs/cgroup/cpu/test.slice/threadtest.service