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Fix: crash when accessing attributes from multiple threads 

Calling two non-const methods on a `MutableAttributeAccessor`
at the same time in multiple threads is not safe.

While I don't know what caused the crash here exactly, I do know
that it happens while looking up the attribute for writing, which
may modify the unterlying geometry. I couldn't reproduce the
bug with a debug build or without threading.
This commit is contained in:
Jacques Lucke 2022-07-25 11:14:42 +02:00
parent 44258b5ad0
commit cacdea7f4a
Notes: blender-bot 2023-02-13 23:17:13 +01:00 
Referenced by commit 55fb2abc81, Curves: Bring back parallel copying of curve and point attributes
1 changed files with 7 additions and 10 deletions
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17
source/blender/blenkernel/intern/curves_geometry.cc
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@ -1163,8 +1163,8 @@ static CurvesGeometry copy_with_removed_points(const CurvesGeometry &curves,
threading::parallel_invoke(
/* Initialize curve offsets. */
[&]() { new_curves.offsets_for_write().copy_from(new_curve_offsets); },
/* Copy over point attributes. */
[&]() {
/* Copy over point attributes. */
for (auto &attribute : bke::retrieve_attributes_for_transfer(
curves.attributes(), new_curves.attributes_for_write(), ATTR_DOMAIN_MASK_POINT)) {
threading::parallel_for(copy_point_ranges.index_range(), 128, [&](IndexRange range) {
@ -1179,11 +1179,10 @@ static CurvesGeometry copy_with_removed_points(const CurvesGeometry &curves,
});
attribute.dst.finish();
}
},
/* Copy over curve attributes.
* In some cases points are just dissolved, so the the number of
* curves will be the same. That could be optimized in the future. */
[&]() {
/* Copy over curve attributes.
* In some cases points are just dissolved, so the the number of
* curves will be the same. That could be optimized in the future. */
for (auto &attribute : bke::retrieve_attributes_for_transfer(
curves.attributes(), new_curves.attributes_for_write(), ATTR_DOMAIN_MASK_CURVE)) {
if (new_curves.curves_num() == curves.curves_num()) {
@ -1260,8 +1259,8 @@ static CurvesGeometry copy_with_removed_curves(const CurvesGeometry &curves,
}
});
},
/* Copy over point attributes. */
[&]() {
/* Copy over point attributes. */
for (auto &attribute : bke::retrieve_attributes_for_transfer(
curves.attributes(), new_curves.attributes_for_write(), ATTR_DOMAIN_MASK_POINT)) {
threading::parallel_for(old_curve_ranges.index_range(), 128, [&](IndexRange range) {
@ -1275,9 +1274,7 @@ static CurvesGeometry copy_with_removed_curves(const CurvesGeometry &curves,
});
attribute.dst.finish();
}
},
/* Copy over curve attributes. */
[&]() {
/* Copy over curve attributes. */
for (auto &attribute : bke::retrieve_attributes_for_transfer(
curves.attributes(), new_curves.attributes_for_write(), ATTR_DOMAIN_MASK_CURVE)) {
threading::parallel_for(old_curve_ranges.index_range(), 128, [&](IndexRange range) {