取消一个线程

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

void *thread_function(void *arg);

int main()
{
int res;
pthread_t a_thread;
void *thread_result;

res = pthread_create(&a_thread, NULL, thread_function, NULL);
if (res != 0)
{
perror("Thread create failed!");
exit(EXIT_FAILURE);
}

sleep(4);
printf("Canceling thread...\n");

res = pthread_cancel(a_thread);
if (res != 0)
{
perror("Thread cancel failed!");
exit(EXIT_FAILURE);
}

printf ("Waiting for thread to finished...\n");

res = pthread_join(a_thread, &thread_result);
if (res != 0)
{
perror ("Thread join failed!");
exit(EXIT_FAILURE);
}

printf("Thread canceled!");

exit(EXIT_FAILURE);
}

void *thread_function(void *arg)
{
int i;
int res;

res = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (res != 0)
{
perror("Thread setcancelstate failed!");
exit(EXIT_FAILURE);
}

res = pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);
if (res != 0)
{
perror("Thread setcanceltype failed!");
exit(EXIT_FAILURE);
}

printf("thread_function is running...\n");

for (i = 0; i < 10; i++)
{
printf("Thread is still running (%d)...\n", i);
sleep(1);
}
pthread_exit(0);
}