High Quality Content by WIKIPEDIA articles! Thread safety is a computer programming concept applicable in the context of multi-threaded programs. A piece of code is thread-safe if it functions correctly during simultaneous execution by multiple threads. Thread safety is a key challenge in multi-threaded programming. It was once only a concern of the operating system programmer but since the late 1990s has become a commonplace issue. In a multi-threaded program, several threads execute simultaneously in a shared address space. Every thread has access to virtually all the memory of every other thread. Thus the flow of control and the sequence of accesses to data often have little relation to what would be reasonably expected by looking at the text of the program, violating the principle of least astonishment. Thread safety is a property aimed at minimizing surprising behavior by re-establishing some of the correspondences between the actual flow of control and the text of the program.

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