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
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
These dialogs don't have growable features but do have conditional
features, so the size is better adjusted automatically by the code
then by the user.
So many things can go wrong with this control in GTK. We have to
collapse the tree when updating the search string to avoid a crash when
referencing a child object but collapsing the tree will iterate over
elements and crash when we have deleted a symbol.
The temporary fix for this nonsense is to carefully order the calls.
We only need to collapse the search tree if we are not keeping our state
(in other words if we are fully re-building the tree)
Fixes https://gitlab.com/kicad/code/kicad/issues/6910
Versions specific variables that may point to objects that change
through versions, allowing multiple KiCad versions to operate correctly
(even on MSW) on the same machine.
Also don't load the footprints up front. The whole purpose of the
footprint-info stuff is to have enough info about the footprints to
filter them *without* loading. After that just load individual
footprints as we need them.
Fixes https://gitlab.com/kicad/code/kicad/issues/6177
Jeff Young
mitxela
Ian McInerney
Jon Evans
Seth Hillbrand
Dominik Wernberger
Wayne Stambaugh
Zoltan Gyarmati
lê văn lập
Marek Roszko