初探线程02

1.线程的取消

NAME
    pthread_cancel - send a cancellation request to a thread

SYNOPSIS
    #include <pthread.h>

    int pthread_cancel(pthread_t thread);

①取消有两种状态，允许和不允许
②允许取消又分为
异步cancel
推迟cancel(默认) 推迟到cancel点才被响应
cancel点: posix定义的cancel点 都是可能引发阻塞的系统调用

2.pthread_setcancelstate

设置取消方式

NAME
pthread_setcancelstate, pthread_setcanceltype - set cancelability state and type

SYNOPSIS
#include <pthread.h>

int pthread_setcancelstate(int state, int *oldstate);

3.pthread_testcancel

设置一个取消点

NAME
       pthread_testcancel - request delivery of any pending cancellation request

SYNOPSIS
       #include <pthread.h>

       void pthread_testcancel(void);

4.线程分离

NAME
       pthread_detach - detach a thread

SYNOPSIS
       #include <pthread.h>

       int pthread_detach(pthread_t thread);

分离一个线程，与之毫无关系，如果调用join会报错