timers.cpp

来自「最新的版本ACE-5.6.8,刚从外文网上搬下,与大家分享.」· C++ 代码 · 共 83 行

// $Id: Timers.cpp 80826 2008-03-04 14:51:23Z wotte $

#include "ace/config-all.h"
#include "ace/OS_main.h"

#if !defined (ACE_LACKS_FORK)

#include "ace/streams.h"
#include "ace/OS_NS_unistd.h"
#include "ace/OS_NS_time.h"
#include "ace/OS_NS_signal.h"

typedef void (*timerTask_t)(void);

// Listing 1 code/ch07
pid_t timerTask (int initialDelay,
                 int interval,
                 timerTask_t task)
{
  if (initialDelay < 1 && interval < 1)
    return -1;

  pid_t pid = ACE_OS::fork ();

  if (pid < 0)
    return -1;

  if (pid > 0)
    return pid;

  if (initialDelay > 0)
    ACE_OS::sleep (initialDelay);

  if (interval < 1)
    return 0;

  while (1)
    {
      (*task) ();
      ACE_OS::sleep (interval);
    }

  ACE_NOTREACHED (return 0);
}
// Listing 1

// Listing 2 code/ch07
void foo ()
{
  time_t now = ACE_OS::time (0);
  cerr << "The time is " << ACE_OS::ctime (&now) << endl;
}
// Listing 2

void programMainLoop (void)
{
  ACE_OS::sleep (30);
}

// Listing 3 code/ch07
int ACE_TMAIN (int, ACE_TCHAR *[])
{
  pid_t timerId = timerTask (3, 5, foo);
  programMainLoop ();
  ACE_OS::kill (timerId, SIGINT);
  return 0;
}
// Listing 3

#else
#include "ace/OS_NS_stdio.h"

int ACE_TMAIN (int, ACE_TCHAR *[])
{
  //FUZZ: disable check_for_lack_ACE_OS
  ACE_OS::puts ("This very unportable example requires fork().\n");
  //FUZZ: enable check_for_lack_ACE_OS

  return 0;
}

#endif /* ACE_LACKS_FORK */