pthread_cancel

#include "stdio.h"
#include "string.h"
#include "pthread.h"
#include "unistd.h"
#include "stdlib.h"


void * thr_fn1(void *arg)
{
    printf("thread 1 returning\n");
    return (void *)1;
}

void * thr_fn2(void *arg)
{
    printf("thread 2 returning\n");
    return (void *)2;
}

void * thr_fn3(void *arg)
{
    while(1)
    {
        printf("thread 3 writing\n");
        sleep(1);
    }
}

int main(void)
{
    pthread_t tid = 0;
    void *tret = NULL;

    pthread_create(&tid,NULL,thr_fn1,NULL);
    pthread_join(tid,&tret);
    printf("thread 1 exit code %d\n",tret);

    pthread_create(&tid,NULL,thr_fn2,NULL);
    pthread_join(tid,&tret);
    printf("thread 2 exit code %d\n",tret);

    pthread_create(&tid,NULL,thr_fn3,NULL);
    sleep(3);
    pthread_cancel(tid);/*强制结束thr_fn3*/
    pthread_join(tid,&tret);
    printf("thread 2 exit code %d\n",tret);

    return 0;
}

编    译：gcc -o pthread_create pthread_create.c -l pthread
运行结果：
thread 1 returning
thread 1 exit code 1
thread 2 returning
thread 2 exit code 2
thread 3 writing
thread 3 writing
thread 3 writing
thread 2 exit code -1