Hi Daniel, boost::thread:sleep takes a time, not a duration. For details, rationale etc rtfm. ________________________________ From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Daniel Winsor Sent: Wednesday, 11 October 2006 4:40 PM To: boost-users@lists.boost.org Subject: [Boost-users] [thread] bug: thread::sleep can't 'Idle' #include #include #include //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. ########################################################################## This e-mail is for the use of the intended recipient(s) only. If you have received this e-mail in error, please notify the sender immediately and then delete it. If you are not the intended recipient, you must not use, disclose or distribute this e-mail without the author's prior permission. We have taken precautions to minimise the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. ##########################################################################