有关多线程的问题，求教

[liuxialong]

1 #include <iostream>
2 #include <unistd.h>
3 #include <pthread.h>
4
5 using std::cout;

6 using std::endl;
7
8 static int num=0;
9
10 void clean_up(void *)
11 {
12 num++;
13 }
14
15 void *func(void *)
16 {
17 pthread_cleanup_push(clean_up, NULL);
18 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
19 while(1)
20 {
21 int a=0;
22 }
23 pthread_cleanup_pop(0);
24 return (void *)1;
25 }
26
27 int main(void)
28 {
29 pthread_t tid[1024];
30 for(int i=0; i<1024; i++)
31 {
32 pthread_create(&tid[i], NULL, func, NULL);
33 }
34 sleep(10);
35 for(int i=0; i<1024; i++)
36 {
37 pthread_cancel(tid[i]);
38 }
39 sleep(10);
40 cout<<num<<endl;
41 return 0;
42
43 }

程序执行的结果却是：
terminate called without an active exception
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively
terminate called without an active exception
terminate called recursively
已放弃


不明白，为什么会这样的结果，求高手解答！！！！！

[liuxialong]

改10也一样，只不过terminate called recursively次数少些
[Quote=引用 2 楼 abao623660072 的回复:]

改少点看看运行结果.
[/Quote]

[yanook]

发现两个地方可能有问题：
1.创建线程太多，你可以用ulimit -s 看看每个线程占多大内存，一般是8m 计算一下8m*1024=？
2.pthread_cancel（）用法貌似不太对，我的猜测，你可以跟踪一下。

[yanook]

删除39行的 sleep(10);
pthread_cancel（）堵塞

[「已注销」]

[Quote=引用 5 楼 yanook 的回复:]

删除39行的 sleep(10);
pthread_cancel（）堵塞
[/Quote]
不明白你你所说的阻塞，请教。

[wyjq395]

你的线程id怎么从0开始啊，不考虑是不是特殊的线程，也不考虑有没有被占用？

[liuxialong]

线程不是从0开始，线程id是用个数组来储存的
[Quote=引用 7 楼 wyjq395 的回复:]

你的线程id怎么从0开始啊，不考虑是不是特殊的线程，也不考虑有没有被占用？
[/Quote]

[justkk]

线程数目太多了吧
1024改为10试试看

[金刚葫芦娃]

改少点看看运行结果.

[wyjq395]

  15 void *func(void *)
  16 {
  17 pthread_cleanup_push(clean_up, NULL);
  18 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
  19 while(1)
  20 {
  21 int a=0;
  22 }
  23 pthread_cleanup_pop(0);
  24 return (void *)1;
  25 }

这个函数错了，你用while(1)就不会执行到pthread_cleanup_pop(0);
你可以试一试把19到22行注释掉。