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Bug #6226
closed
Race condition initialising UnicodeBlocks class
Start date:
2023-10-18
Due date:
% Done:
0%
Estimated time:
Legacy ID:
Applies to branch:
10, 11, 12, trunk
Fix Committed on Branch:
11, 12, trunk
Fixed in Maintenance Release:
Platforms:
.NET, Java
Description
Seen in v9.9.1-8 but the code is the same in v12.3
There is a potential race condition when readBlocks() is called in net.sf.saxon.regex.UnicodeBlocks. Because the blocks instance variable is set at the start of readBlocks(), there is the potential for another thread to read it and find it populated, partially populated or empty depending on timing.
I suggest changing it to use the Initialization-on-demand holder idiom in a similar way to issue https://saxonica.plan.io/issues/6225
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