Philippe Gerum authored Jan 31, 2021 and Jan Kiszka committed Feb 03, 2021

Although the synchronous single-stepping code has moved to the I-pipe
section, we should be able to reuse the current logic nearly as is on
top of Dovetail, with only minor adjustments.

However, compared to the previous implementation, the single-stepping
status (XNCONTHI) and the user return notifier are armed _after_ the
personality handlers have run, in the relaxing path for the current
thread (see xnthread_relax()). This change should not affect the
overall logic, assuming no custom relax handler was depending on the
original sequence of actions (which they should definitely not
anyway).

We keep this commit which does introduce a small functional change
separated from the other scheduler-related modifications, as a
convenience for chasing regressions if need be.

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>