有关多线程的问题，求教

2011-07-01 11:01:53 270 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

[Java]多线程的九大问题很多时候，我们为了提升接口的性能，会把之前单线程同步执行的代码，改成多线程异步执行。比如：查询用户信息接口，需要返回用户基本信息、积分信息、成长值信息，而用户、积分和成长值，需要调用不同的接口获取数据。如果查询用户信息接口，同步调用三个接口获取数据，会非常耗时。这就非常有必要把三个接口调用，改成异步调用，最后汇总结果。再比如：注册用户接口，该接口主要包含：写用户表，分配权限，配置用户导航页，发通知消息等功能。该用户注册接口包含的业务逻辑比较多，如果在接口中同步执行这些代码，该接口响应时间会非常慢。阅读详情

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！！！！！

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