#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"
#include "ace/Sig_Handler.h"

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);
};

void
SignalableTask::process_message (ACE_Message_Block *)
{
  return;
}

void
SignalableTask::handle_alert (void)
{
  return;
}

// Listing 1 code/ch13
int ACE_TMAIN (int, ACE_TCHAR *[])
{
  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) Main thread\n")));
  SignalableTask handler;
  handler.activate (THR_NEW_LWP | THR_JOINABLE, 5);

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

  ACE_OS::sleep (1);      // Allow threads to start

  for (int i = 0; i < 5; i++)
    ACE_OS::kill (ACE_OS::getpid (), SIGUSR1);
  handler.wait ();
  return 0;
}
// Listing 1

#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 */
