tree de54a68a549b2eefd54e416c5bc7c0077c948812
parent 8b72a5736ae276162c40a7530d18f2dbfbd73bd4
author Ewout van Bekkum <ewout@google.com> 1615318508 -0800
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1615395335 +0000

pw_sync: change SpinLock to have a constexpr ctor

Changes the pw::sync::SpinLock facade to have a constexpr
constructor. Outside of making the constructor possible to be
evaluated at compile time, this grossly simplifies the use of the
SpinLock during early boot before static global C++ constructors
are executed.

Change-Id: Iebe6708f27e5e235c981e5d9d6431f2d9f732b52
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/36580
Reviewed-by: Ewout van Bekkum <ewout@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>