tree 890766f210bc070daf03ba44ba1d19df62de1101
parent 49a4a82d9378794639a19494ffaf042bfbd50de4
author Ewout van Bekkum <ewout@google.com> 1608667218 -0800
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1611798440 +0000

pw_thread: adds the initial pw_thread module

Adds a std::this_thread like API through the pw_thread facades, that
is:
1) this_thread::yield
2) this_thread::sleep_{for,until}
3) this_thread::get_id

This module is split into many different facades in order to let users
decide what functionality they want to use as they may not always
be available, for example when using opaque SDKs.

In addition this provides an initial set of backends based on using
the STL's std::this_thread directly and selects them for the host
target.

Change-Id: I0ee8e4390ba988b2b13e9ee59f976f2333715f1f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/30040
Commit-Queue: Ewout van Bekkum <ewout@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>