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System / Clock getting paused by Sleep()

« on: April 10, 2009, 02:16:49 am »

Couldn't find any information about this so I figuered i'd had to ask

We're currently working on a game projekt and we've done some prototyping in SFML.. From what we can see a sf::Clock will return incorrect values if used along with a sleep.

example1:

Code: [Select]


sf::Clock Clock;
while(true)
{
    //do some stuff, break after 60 seconds
    Sleep(1);
}
std::cout << Clock.GetElapsedTime() << std::endl;

we tested with a stop watch and broke the loop manually after 60 seconds, the Clock.GetElapsedTime() would return a value of ~35 seconds.

example2:

Code: [Select]


sf::Clock Clock;
while(true)
{
    //do some stuff, break after 60 seconds
    //Sleep(1);
}
std::cout << Clock.GetElapsedTime() << std::endl;

with the sleep out of the way, and the programm still running for 60 seconds, it returned a far more precise value.

Is there something we're doing wrong or is this a bug?

to work around it we're using floats in wich we add all the sleep values and then add the Clocks time.

edit: I'm using windows XP btw.