tree 3a43b99ce98b8fca474c08ea88f33bc1d2eb5883
parent 5ba80646bf2c845e02ba0188ad8095725a90607f
author Ewout van Bekkum <ewout@google.com> 1624396782 -0700
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1624410870 +0000

pw_sync_threadx: Disable thread switching in the ISL

Updates the pw::sync::InterruptSpinLock implementation for ThreadX
to disable thread switching if not in an interrupt by raising the
preemption threshold. This way there's no risk that the current
thread gets switched out to another which recursively attempts to
grab the same lock.

This also changes the internal state to use a plain bool instead
of an atomic bool as an atomic is not necessary.

Change-Id: Id02869e66abaee956d1275dc181d1c14777c9cbe
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/50463
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>