[Boost-users] Re: Looking for some help with boost::thread::sleep()

From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-08-03 18:19:45

Kutch, Patrick G wrote:

> Has nobody else experienced this? 

Sorry, I forgot all about answering your original post.

If you look at the thread::sleep() method, it looks like the following; 
can you tell me which path it's taking (there are several options for 
pthreads) when you have the problem?

void thread::sleep(const xtime& xt)
{
     for (int foo=0; foo < 5; ++foo)
     {
#if defined(BOOST_HAS_WINTHREADS)
         int milliseconds;
         to_duration(xt, milliseconds);
         Sleep(milliseconds);
#elif defined(BOOST_HAS_PTHREADS)
#   if defined(BOOST_HAS_PTHREAD_DELAY_NP)
         timespec ts;
         to_timespec_duration(xt, ts);
         int res = 0;
         res = pthread_delay_np(&ts);
         assert(res == 0);
#   elif defined(BOOST_HAS_NANOSLEEP)
         timespec ts;
         to_timespec_duration(xt, ts);

         //  nanosleep takes a timespec that is an offset, not
         //  an absolute time.
         nanosleep(&ts, 0);
#   else
         mutex mx;
         mutex::scoped_lock lock(mx);
         condition cond;
         cond.timed_wait(lock, xt);
#   endif
#elif defined(BOOST_HAS_MPTASKS)
         int microseconds;
         to_microduration(xt, microseconds);
         Duration lMicroseconds(kDurationMicrosecond * microseconds);
         AbsoluteTime sWakeTime(DurationToAbsolute(lMicroseconds));
         threads::mac::detail::safe_delay_until(&sWakeTime);
#endif
         xtime cur;
         xtime_get(&cur, TIME_UTC);
         if (xtime_cmp(xt, cur) <= 0)
             return;
     }
}

Mike