signals.cpp

ACE自适配通信环境（ADAPTIVE Communication Environment）是可以自由使用、开放源码的面向对象（OO）框架（Framework）

// Signals.cpp,v 1.6 2005/12/30 11:02:02 jwillemsen Exp

#include "ace/config-lite.h"
#if defined (ACE_HAS_THREADS)

#include "ace/OS_NS_time.h"
#include "ace/OS_NS_unistd.h"
#include "ace/Task.h"
#include "ace/Log_Msg.h"
#include "ace/Signal.h"

// Listing 1 code/ch13
class SignalableTask : public ACE_Task<ACE_MT_SYNCH>
{
public:
  virtual int handle_signal (int signum,
                             siginfo_t *  = 0,
                             ucontext_t * = 0)
  {
    if (signum == SIGUSR1)
      {
        ACE_DEBUG ((LM_DEBUG,
                    ACE_TEXT ("(%t) received a %S signal\n"),
                    signum));
        handle_alert ();
      }
    return 0;
  }

  virtual int svc (void)
  {
    ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) Starting thread\n")));

    while (1)
      {
        ACE_Message_Block* mb = 0;
        ACE_Time_Value tv (0, 1000);
        tv += ACE_OS::time (0);
        int result = this->getq (mb, &tv);
        if (result == -1 && errno == EWOULDBLOCK)
          continue;
        else
          process_message (mb);
      }

      ACE_NOTREACHED (return 0);
    }

  void handle_alert ();
  void process_message (ACE_Message_Block *mb);
};
// Listing 1

void
SignalableTask::process_message (ACE_Message_Block *)
{
}

void
SignalableTask::handle_alert ()
{
}

// Listing 2 code/ch13
int ACE_TMAIN (int, ACE_TCHAR *[])
{
  SignalableTask handler;
  handler.activate (THR_NEW_LWP | THR_JOINABLE , 5);

  ACE_Sig_Handler sh;
  sh.register_handler (SIGUSR1, &handler);

  ACE_OS::sleep (1);

  ACE_Thread_Manager::instance () ->
    kill_grp (handler.grp_id (), SIGUSR1);
  handler.wait ();
  return 0;
}
// Listing 2
#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Task<ACE_MT_SYNCH>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
pragma instantiate ACE_Task<ACE_MT_SYNCH>;
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */

#else
#include "ace/OS_main.h"
#include "ace/OS_NS_stdio.h"

int ACE_TMAIN (int, ACE_TCHAR *[])
{
  ACE_OS::puts (ACE_TEXT ("This example requires threads."));
  return 0;
}

#endif /* ACE_HAS_THREADS */