Forever Kid escribió:

What is the resolution of the boost sleep() function?

... What about sleeping for ~100 millseconds? (Excuse my english :*)) Do you mean 100 milliseconds ( 100 * 10^-3)? I will assume that. How is that accomplished? Here: http://www.boost.org/doc/html/xtime.html it says: "For maximum portability, avoid durations of less than one second."

I've never tried to sleep a thread for less than a second, but it seems that the resolution is implementation specific...

Does this work?

xTime.nsec += 100000; boost::thread::sleep(xTime);

"nsec" stands for "nanosecond", doesn't it? So 100 milliseconds is 100000000 nanoseconds: xTime.nsec += 100000000; Also, you have to account for the possible overflow: const int NANOSECONDS_PER_SECOND = 1000000000; if(xTime.nsec>=NANOSECONDS_PER_SECOND) { xTime.nsec -= NANOSECONDS_PER_SECOND; xTime.sec += 1; } Perhaps you find useful the function delay() that you can find in libs/thread/test/util.inl of your Boost 1.33.1 distribution: inline boost::xtime delay(int secs, int msecs=0, int nsecs=0) { const int MILLISECONDS_PER_SECOND = 1000; const int NANOSECONDS_PER_SECOND = 1000000000; const int NANOSECONDS_PER_MILLISECOND = 1000000; boost::xtime xt; if (boost::TIME_UTC != boost::xtime_get (&xt, boost::TIME_UTC)) BOOST_ERROR ("boost::xtime_get != boost::TIME_UTC"); nsecs += xt.nsec; msecs += nsecs / NANOSECONDS_PER_MILLISECOND; secs += msecs / MILLISECONDS_PER_SECOND; nsecs += (msecs % MILLISECONDS_PER_SECOND) * NANOSECONDS_PER_MILLISECOND; xt.nsec = nsecs % NANOSECONDS_PER_SECOND; xt.sec += secs + (nsecs / NANOSECONDS_PER_SECOND); return xt; }