ACE 演练: 让程序响应ctrl+c信号

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#c #signal #semaphore #thread #class #object

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本文发致Stone Jiang的博客以及www.ace-tao.org/bbs。 2008-10-21

转贴请注明。

让程序响应ctrl+c信号，并让程序优雅地关闭（后续演练将展示）非常必要。本文即给出如何让程序响应ctrl+c的示例。

从本文您可以学到:

1. 如何使用MPC工具生成项目工程文件;

2. 如何编写最简单的ACE程序；

本文适用于：

ACE菜鸟，并且能已经正确下载、安装ACE。

ACE高手请漂过。

过程：

1. 创建Quit目录，创建quit.mpc文件

2. 创建 main.cpp, 借用Exit_Signal_Handle类(Exit_Signal_Handle.h,cpp)

3. 编译，调试

1. quit.mpc如下

// file: quit.mpc

// author: stone jiang 2005119@gmail.com

// date: 2008-10-21

project (*) :aceexe {
exename = *
}

2. main.cpp如下

// -*- C++ -*-

//=============================================================================
/**
* @file Exit_Signal_Handler.cpp
*
* $Id$
*
* @author Stone Jiang (2005119@gmail.com)
*/
//=============================================================================

#include "ace/Log_Msg.h"
#include "ace/Sig_Handler.h"
#include "Exit_Signal_Handler.h"

int ACE_TMAIN(int, ACE_TCHAR *[])
{
ACE_DEBUG((LM_DEBUG,ACE_TEXT("Starting...../n")));
ACE_Thread_Semaphore lock (0);

    Exit_Signal_Handler exit_handler (lock);
    ACE_Sig_Handler sig_handler;
    sig_handler.register_handler (SIGINT, &exit_handler);

    ACE_Guard guard (lock);
    ACE_DEBUG((LM_DEBUG,ACE_TEXT("Terminate...../n")));
    return 0;
}

3. Exit_Signal_Handle类的实现如下

// -*- C++ -*-

//=============================================================================
/**
* @file Exit_Signal_Handler.h
*
* $Id$
*
* @author Friedhelm Wolf (fwolf@dre.vanderbilt.edu)
*/
//=============================================================================

#ifndef _EXIT_SIGNAL_HANDLER_H_
#define _EXIT_SIGNAL_HANDLER_H_

#include
#include

/**
* @class Exit_Signal_Handler
*
* @brief this class handles the kill signal for this application in a nice
* way, releasing a semaphore.
*/
class Exit_Signal_Handler : public ACE_Event_Handler
{
public:

/// ctor
Exit_Signal_Handler (ACE_Thread_Semaphore & lock);

/// dtor
virtual ~Exit_Signal_Handler ();

/// Called when object is signaled by OS (either via UNIX signals or
/// when a Win32 object becomes signaled).
virtual int handle_signal (int signum, siginfo_t *, ucontext_t *);

private:
ACE_Thread_Semaphore & lock_;
};

#endif /* _EXIT_SIGNAL_HANDLER_H_ */

// -*- C++ -*-

//=============================================================================
/**
* @file Exit_Signal_Handler.cpp
*
* $Id$
*
* @author Friedhelm Wolf (fwolf@dre.vanderbilt.edu)
*/
//=============================================================================

#include
#include "Exit_Signal_Handler.h"

Exit_Signal_Handler::Exit_Signal_Handler (ACE_Thread_Semaphore & lock)
: lock_ (lock)
{
}

Exit_Signal_Handler::~Exit_Signal_Handler ()
{
}

int
Exit_Signal_Handler::handle_signal (int , siginfo_t *, ucontext_t *)
{
return lock_.release ();
}

4. 生成工程文档

以Viusal studio 2008为例

如果是linux, vc9改为gnuace,如果是Visual Stuido 2003,2005，改为vc71,vc8

> mwc.pl -type vc9