Two issues found with the locking system used to prevent access to
stale connectivity data during the zone fill process:
1) a std::mutex has undefined behavior if you try to use it to guard
against access from the same thread. Because of the use of wx event
loops (and coroutines) it is entirely possible, and in some situations
inevitable, that the same thread will try to redraw the ratsnest in the
middle of zone refilling.
2) The mutex was only guarding the ZONE_FILLER::Fill method, but the callers
of that method also do connectivity updates as part of the COMMIT::Push.
Redrawing the ratsnest after the Fill but before the Push will result in
stale connectivity pointers to zone filled areas.
Fixed (1) by switching to a trivial spinlock implementation. Spinlocks would
generally not be desirable if the contention for the connectivity data crossed
thread boundaries, but at the moment I believe it's guaranteed that the reads
and writes to connectivity that are guarded by this lock happen from the main
UI thread. The writes are also quite rare compared to reads, and reads are
generally fast, so I'm not really worried about the UI thread spinning for any
real amount of time.
Fixed (2) by moving the locking location up to the call sites of
ZONE_FILLER::Fill.
This issue was quite difficult to reproduce, but I found a fairly reliable way:
It only happens (for me) on Windows, MSYS2 build, with wxWidgets 3.0
It also only happens if I restrict PcbNew to use 2 CPU cores.
With those conditions, I can reproduce the issue described in #6471 by
repeatedly editing a zone properties and changing its net. The crash is
especially easy to trigger if you press some keys (such as 'e' for edit)
while the progress dialog is displayed. It's easiest to do this in a debug
build as the slower KiCad is running, the bigger the window is to trigger this
bug.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/6471
Fixes https://gitlab.com/kicad/code/kicad/-/issues/7048
Before processing the select tool actions, we check if the router is
currently active and if it is, pass the event for processing in other
tools
Fixes https://gitlab.com/kicad/code/kicad/issues/7021
Check for footprint editor
Promote pad edits to footprint edits iff
- Pad is locked
- Footprint is not
Otherwise, handle the pad normally and prompt for locked items if found
Many, many KIDIALOGs use OK/Cancel and then rename both buttons to
confirm or deny some action. In those cases we *do* want to store
the deny actions if they check "Do Not Show Again".
Fixes https://gitlab.com/kicad/code/kicad/issues/6979
Prompting to unlock is obtrusive and blocks the common action of
dragging from a pad to align footprints. The less common action of
editing pads in layout can be accomplished after unlocking the pads
Fixes https://gitlab.com/kicad/code/kicad/issues/6997
Our rendering pipeline is not set up for this kind of speed,
and this is a blocking operation at the moment.
Note that we will get an update at the end of the move
because OnModify does it.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/6819
Jeff Young
Michael Kavanagh
Seth Hillbrand
Jon Evans
Roberto Fernandez Bautista
Mikolaj Wielgus
hoijui