chenBright commented on PR #2215:
URL: https://github.com/apache/brpc/pull/2215#issuecomment-1525295355
> > 需要考虑线程池退出问题吗？
>
> 这块参考了usercode backup pool的实现，它里面有个注释，所以我这块好像也得按照这个方式处理。 int
UserCodeBackupPool::Init() { // Like bthread workers, these threads never quit
(to avoid potential hang // during termination of program). for (int i = 0; i <
FLAGS_usercode_backup_threads; ++i) { pthread_t th; if (pthread_create(&th,
NULL, UserCodeRunner, this) != 0) { LOG(ERROR) << "Fail to create
UserCodeRunner"; return -1; } } return 0; }
UserCodeBackupPool是框架里使用的，进程运行时是不会析构的。
```c++
static UserCodeBackupPool* s_usercode_pool = NULL;
```
该PR里的UserCodeThreadPool是给用户使用的，UserCodeThreadPool有可能会析构，但是线程池里的线程没有退出，有crash的可能。
在UserCodeThreadPool析构函数中做一下stop and join操作，是不是合理一些呢？
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