tree dbf155c7aec090599b7c72c480e768794ce16faf
parent 04965817fcb78ef988a810b0f8133b93f7fdeea1
author Ewout van Bekkum <ewout@google.com> 1637696942 -0800
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1637702243 +0000

pw_sync/interrupt_spin_lock: Optimize try_lock for uniprocesors

Optimizes the existing backends for InterruptSpinLocks to implement
try_lock through lock, given that the existing uniprocessor backends
do not support SMP and ergo you cannot fail to acquire a lock. The
only risk is that you recursively lock which is already guarded
against by the lock implementation.

Also updates the backends to consistently use debug asserts to
guard against recursive locking.

And lastly it disables some test behavior which relied on recursive
locking which is undefined behavior.

Change-Id: I991e56ab14df7efd2cd297b6dc2255ac318e4c0d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/70528
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>