sleep should have nanosecond precision

[thestinger]

This would be a backwards incompatible change to the API.

[alexcrichton]

Closing as a dupe of #11189

[alexcrichton]

As @mahkoh points out, #11189 was handled but this issue has not yet been implemented. Reopening to track the sleeping functions taking this kind of precision into account.

[pnkfelix]

Duration API offers nanosecond precision in API (but does not implement it). Thus purely implementation issue, as @alexcrichton said. P-low, not 1.0.

[mahkoh]

This is an implementation issue but not an implementation detail. Changing this will change the behavior of sleeping programs. The behavior is hardly even documented.

[steveklabnik]

Triage: sleep now takes a Duration, and so will grow a nanosecond precision when Duration does.

[alexcrichton]

Oh this is actually done, Duration has nanosecond precision.

[z3t0]

Hi all, just wanted to ask it seems that sleep() does not sleep to the nanosecond precision?