Thread: sleep function

Originally Posted by pollypocket4eva

Is there anything I can use to make a timer... or basically just a delay without that header?

A long running loop? But that would also eat up a lot of CPU time, and it would wait for a different amount of time on computers with a different CPU speed,
Why wouldn't you want to use sleep()?

As cpjust says, I would like to understand why you want to sleep, and yet you do not want to include the correct header-file to achieve that. Either you need to sleep, and thus need to include the correct headerfile (whatever that may be), or you don't call sleep.

Loops can be very tricky for this, as if you want a delay that works the same on a 500MHz P3 with compiled with low optimization level and a 4GHz P4 with compiled with high optimization settings, you need some pretty clever programming. Not to mention than many compilers will optimize empty loops into "nothing".

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Mats

And how would not including a header be an improvement?

Originally Posted by Salem

And how would not including a header be an improvement?

My guess is that this is misdirected attempt to "fancy up" a program, but the students are given a strict list of header files. So the student is trying to solve the problem in a way that doesn't involve including some header that is on the "white-list", and still get the desired delaying effect. I say misdirected, because for the most cases, delays/sleeps are completely meaningless to average users, and annoying to advanced users.

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Mats

In a single-tasking OS, there is obviously nothing other than looping that will do this job, and as suggested, there is a sleep/delay function that will sleep for a set amount of time.

I'm fully aware of the need to delay or stop an application for some time. However, I also know that there are LOTS of programmers who use this sort of thing unnecessarily in their programs when displaying messages etc. - the delay is often too short for new users, and gets annoying when it takes too long for experienced users. Waiting for the user to press a key is a much better approach in this sort of usage.

Finally, perhaps one of the moderator team could split the new posts on this topic from the old thread.

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Mats