[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [MiNT] nanosleep

Hi,

On maanantai 21 tammikuu 2013, Peter Slegg wrote:
> I suspect my mintlib might be too old to include nanosleep.
> Is there some way of checking ?

nm /usr/lib/libc.a | grep sleep

The one marked with "T" is the real implementation, others
are references to that.

My MiNTlib from Sparemint (= v0.59.1) doesn't seem to contain
nanosleep(), just usleep().

But why nanosleep() is needed, isn't usleep() microsecond
accuracy enough? [1]

nanosleep() is POSIX 2001, usleep() is BSD function.


[1] On a pre-emptive multitasking OS, process gets
pre-empted at arbitrary times and busy other processes
can lenghten the sleep at max by:
	<number of busy processes> * <scheduling slice>

Even with just one, busy process it's milliseconds,
not microseconds.


	- Eero