pthread_attr_t就是对应线程的属性

/*
    #include <pthread.h>
    int pthread_attr_init(pthread_attr_t *attr);
        初始化线程属性变量
    int pthread_attr_destroy(pthread_attr_t *attr);
        释放线程属性资源
    int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate);
        获取线程分离的状态属性
    int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);
        设置线程分离的状态属性
*/

#include <stdio.h>
#include <pthread.h>
#include <string.h>
#include <unistd.h>

void* callback(void* arg) {
    printf("child thread id:%ld", pthread_self());
    return NULL;
}

int main() {

    //创建一个线程属性变量
    pthread_attr_t attr;
    //初始化
    pthread_attr_init(&attr);
    //设置属性
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    //创建一个子线程
    pthread_t tid;
    int ret = pthread_create(&tid, &attr, callback, NULL);
    if(ret != 0) {
        char* strerr = strerror(ret);
        printf("error: %s\n", strerr);
    }

    printf("tid: %ld, main thread id:%ld\n", tid, pthread_self());

    size_t size;
    pthread_attr_getstacksize(&attr, &size);

    printf("%ld\n", size);
    pthread_attr_destroy(&attr);

    pthread_exit(NULL);

    return 0;
}