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// -*- C++ -*-
//=============================================================================
/**
* @file Signal_Handler.h
*
* @author Ossama Othman <ossama@uci.edu>
*/
//=============================================================================
#ifndef TAO_LB_SIGNAL_HANDLER_H
#define TAO_LB_SIGNAL_HANDLER_H
#include "ace/Task.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/ORB.h"
#include "tao/PortableServer/PortableServer.h"
#include "ace/Signal.h"
/**
* @class TAO_LB_Signal_Handler
*
* @brief Active object designed to handle signals synchronously.
*
* This class handles signals synchronously in the multi-threaded case,
* and asynchronously through a Reactor in the single-threaded case.
* @par
* The goal of this signal handler is to ensure proper cleanup of
* resources created by servants upon interruption by signals. For
* example, suppose a user sends a
* SIGINT (e.g. types CTRL-C) signal to an application. The servants
* in that application should be shutdown gracefully so that all
* resources handled by those servants are cleaned up. This is
* particularly important for resources that are not cleaned up
* automatically.
*/
class TAO_LB_Signal_Handler : public ACE_Task_Base
{
public:
/// Constructor.
TAO_LB_Signal_Handler (CORBA::ORB_ptr orb,
PortableServer::POA_ptr poa);
/// Run by a daemon thread to handle signals synchronously.
virtual int svc (void);
/// Active object activation method.
/**
* This override blocks all signals in the calling thread before
* spawning the synchronous signal handler.
*/
virtual int activate (long flags = THR_NEW_LWP | THR_JOINABLE,
int n_threads = 1,
int force_active = 0,
long priority = ACE_DEFAULT_THREAD_PRIORITY,
int grp_id = -1,
ACE_Task_Base *task = 0,
ACE_hthread_t thread_handles[] = 0,
void *stack[] = 0,
size_t stack_size[] = 0,
ACE_thread_t thread_ids[] = 0,
const char* thr_name[] = 0);
/// 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 * = 0, ucontext_t * = 0);
protected:
/// Template method that initiates the cleanup process.
virtual int perform_cleanup (int signum);
private:
#ifdef ACE_HAS_THREADS
/// Block all signals before spawning the threads. Then, unblock
/// these signals when this handler is destroyed.
ACE_Sig_Guard signal_guard_;
#endif /* ACE_HAS_THREADS */
/// The set of signals which this handler will handle.
ACE_Sig_Set sigset_;
/// Pseudo-reference to the ORB in which the LoadManager is running.
CORBA::ORB_var orb_;
/// Reference to the POA within which the LoadManager servant is
/// registered.
PortableServer::POA_var poa_;
};
#endif /* TAO_LB_SIGNAL_HANDLER_H */
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