Re: [Boost-users] [thread] bug: thread::sleep can't 'Idle'

From: Darryl Green (Darryl.Green_at_[hidden])
Date: 2006-10-11 03:28:21

Actually - I just tried to rtfm to find the relevant part, and it is
less than obvious given the rather terse description of xtime as a time
or a duration. I don't think anything in boost.threads uses xtime as a
duration (any more - since about 2001)?

________________________________

        From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Darryl Green
        Sent: Wednesday, 11 October 2006 4:48 PM
        To: boost-users_at_[hidden]
        Subject: Re: [Boost-users] [thread] bug: thread::sleep can't
'Idle'
        
        
         
        Hi Daniel,
        boost::thread:sleep takes a time, not a duration. For details,
rationale etc rtfm.

________________________________

                From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Daniel Winsor
                Sent: Wednesday, 11 October 2006 4:40 PM
                To: boost-users_at_[hidden]
                Subject: [Boost-users] [thread] bug: thread::sleep can't
'Idle'
                
                
                
                #include
                <boost/thread/thread.hpp> 
                #include <boost/thread/xtime.hpp>
                #include <Windows.h>//for sleep
                
                void
                ExecuteThread() 
                {
                for(;;) {
                boost::xtime time;
                time.nsec = 0;
                time.sec = 1;
                boost::thread::sleep(time);
                //Sleep(1000);
                }
                }
                
                int
                main() 
                {
                boost::thread thread1(ExecuteThread);
                boost::thread thread2(ExecuteThread);
                thread1.join();
                thread2.join();
                return 0;
                }
                 
                When this program is run with Sleep() instead of
boost::thread::sleep(), and there are no other cpu intensive programs
running, Task Manager shows 99% of the cpu (dual core) is idle.
However, when it is run with boost::thread::sleep(), 99% of the cpu is
being used by the program!  This is a problem because powersaving
features no longer work. 
                 
                When this program with boost::thread::sleep() is run
with another program that is cpu intensive, Task Manager reports the
other program uses 99% of the cpu, so there is no problem there.
                 
                I am using an overclocked Intel Core 2 Duo 6400 if that
matters.

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