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Wiktionary
threadsafe

a. (context computing programming English) That can be safely accessed from multiple threads.

Wikipedia
ThreadSafe

ThreadSafe is a source code analysis tool that identifies application risks and security vulnerabilities associated with concurrency in Java code bases, using whole-program interprocedural analysis. ThreadSafe is used by major investment banks and other companies to identify and avoid software failures in concurrent applications running in complex environments. These are among the most insidious of software defects because they can't be reliably detected by testing.