ACE笔记(4) －ACE_Reactor 机制下 的ACE异常处理

ACE_Manual_Event 类
唤醒所有正在等待的线程，并重新设置信号
常用构造：
ACE_Manual_Event(1) 表当前对象已经准备就绪，一旦有线程处于等待状态，就将触发并重置事件

异常处理的语法结构：
ACE_SEH_TRY
{
//可能发生异常的代码
}
ACE_SEH_EXCEPT (EXCEPTION_EXECUTE_HANDLER)
{
//发生异常后的处理
}

例子（来源于ACE自带的例子）如下

#include "ace/WFMO_Reactor.h"

ACE_RCSID(WFMO_Reactor, Exceptions, "Exceptions.cpp,v 4.1 2002/04/25 04:40:42 irfan Exp")

class Event_Handler : public ACE_Event_Handler
{
public:
Event_Handler (void)
: event_ (1)
{
ACE_DEBUG ((LM_DEBUG,
"Event_Handler created/n"));
}

~Event_Handler (void)
{
ACE_DEBUG ((LM_DEBUG,
"Event_Handler destroyed/n"));
}

int handle_signal (int signum, siginfo_t * = 0, ucontext_t * = 0)
{
char *cause_exception = 0;
char a = *cause_exception;
return 0;
}

ACE_HANDLE get_handle (void) const
{
return this->event_.handle ();
}
private:
ACE_Manual_Event event_;
};

class ACE_WFMO_Reactor_Test
{
public:
static void doit (ACE_WFMO_Reactor &wfmo_reactor)
{
for (int i = 1; i <= 10; i++)
{
ACE_DEBUG ((LM_DEBUG,
"Active threads in WFMO_Reactor (before handle_events) = %d/n",
wfmo_reactor.active_threads_));
ACE_SEH_TRY
{
wfmo_reactor.handle_events ();
}
ACE_SEH_EXCEPT (EXCEPTION_EXECUTE_HANDLER)
{
ACE_DEBUG ((LM_DEBUG,
"Exception occurred/n"));
}
ACE_DEBUG ((LM_DEBUG,
"Active threads in WFMO_Reactor (after handle_events) = %d/n",
wfmo_reactor.active_threads_));
}
}
};

int
ACE_TMAIN (int, ACE_TCHAR *[])
{
Event_Handler handler;
ACE_WFMO_Reactor wfmo_reactor;
wfmo_reactor.register_handler (&handler);

ACE_WFMO_Reactor_Test::doit (wfmo_reactor);

return 0;
}