[LibC] Implement 'clock_gettime', 'clock_settime', 'clock_getres'

[nathanLoretan]

Hello, I try to use the function clock_gettime(). I define _POSIX_TIMERS and I include <time.h> but I always have the error: undefined reference to 'clock_gettime'.

[danielinux]

Hi! In fact clock_gettime/clock_settime/clock_getres are not yet implemented in libC.

I will turn this issue in a feature request and take care of it ASAP. Meanwhile, any chance you can use gettimeofday() ?

Thanks

d

[danielinux]

Not fixed yet for us, so better not close it @nathanLoretan

[brabo]

ok, this is next up on my frosted-calendar!

[brabo]

@nathanLoretan what resolution are you guys expecting clock_gettime() to have? assuming XSI-conformance or?

[nathanLoretan]

CLOCK_REALTIME

…

On Mar 7, 2017 2:22 AM, "brabo" ***@***.***> wrote: @nathanLoretan <https://github.com/nathanLoretan> what resolution are you guys expecting clock_gettime() to have? assuming XSI-conformance or? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#116 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AVzCXqzY2l0ufmU-3Uj1KQyQxnW-Apglks5rjLE6gaJpZM4Lu44f> .

[brabo]

@nathanLoretan that is a clock, not the resolution. i ask because of:
"Although the value of CLOCKS_PER_SEC is required to be 1 million on all XSI-conformant systems, it may be variable on other systems, and it should not be assumed that CLOCKS_PER_SEC is a compile-time constant"
if you assume 1 million per second, it may cause issues as our system clock resolution is only 1000/sec, i.e. millisecond resolution, and i noticed there is no clock_getres() call in uGFX to determine what resolution the system has.

[danielinux]

@brabo we should stick with 1ms resolution for these calls anyhow

[brabo]

@nathanLoretan done, closing this issue ;)

[brabo]

@nathanLoretan note, just include sys/time.h for now, not time.h as posix specifies.

[danielinux]

Related to #120

[brabo]

time.h is there now.