即使不使用多线程处理，也要预先初始化xerces - C+ +以避免多次调用这个函数，然后在应用程序结束时将其终止。
Even if you don't use multithreading, initialize Xerces-C + + up front to avoid multiple calls to this function and then terminate when your application terminates.
如果它们是可接合的线程，且您没有调用pthread_join来联接它们，那么在线程终止后，每个产生的线程都将泄漏大量的内存(至少每堆栈10MB)。
If they are joinable threads and you haven't called the pthread_join to join them, each produced thread will leak a sizeable amount of memory (at least 10mb per stack) after its termination.
注意：bot只在启用时调用线程(记住，每个插件都是一个线程)；在线程终止之后，只有在重新调用bot时才会重启线程。
NOTE: the bot invokes threads (remember that each plug-in is a thread) only when it is started; after a thread terminates it is not restarted until the bot is invoked again.
如果子进程已经被终止则该方法立即返回，调用线程将被锁住直到子进程退出。
This method returns immediately if the subprocess has already terminated. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits.
如果子进程已经被终止则该方法立即返回，调用线程将被锁住直到子进程退出。
This method returns immediately if the subprocess has already terminated. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits.
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