Abstract
It is generally acknowledged that developing correct multi-threaded codes is difficult, because threads may interact with each other in unpredictable ways. The goal of this work is to discover common multi-threaded programming pitfalls, the knowledge of which will be useful in instructing new programmers and in developing tools to aid in multi-threaded programming. To this end, we study multi-threaded applications written by students from introductory operating systems courses. Although the applications are simple, careful inspection and the use of an automatic race detection tool reveal a surprising quantity and variety of synchronization errors. We describe and discuss these errors, evaluate the role of automated tools, and propose new tools for use in the instruction of multi-threaded programming.
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