Scala 2016
Sun 30 - Mon 31 October 2016 Amsterdam, Netherlands
co-located with SPLASH 2016
Mon 31 Oct 2016 13:55 - 14:20 at Matterhorn 2 - Analysis, Testing & Verification Chair(s): Philipp Haller

We present a lightweight library for testing concurrent Scala programs by systematically exploring multiple interleavings between user-specified operations on shared objects. Our library is targeted at beginners of concurrent programming in Scala, runs on a standard JVM, and supports conventional synchronization primitives such as wait, notify, and synchronized. The key component of the library is the trait SchedulableMonitor that accepts a thread schedule, and interleaves as per the schedule all user-specified operations invoked through multiple threads on objects implementing the trait. Using our library, we developed a unit test engine that tests concurrent operations on shared objects on thousands of schedules obtained by bounding the number of context-switches. If a unit test fails on a schedule, the test engine offers as feedback the interleaved traces of execution that resulted in the failure. We used our test engine to automatically test and evaluate two assignments: (a) lock-based producer/consumer problem, and (b) lock-free sorted list implementation, offered to a class of 150 under-graduate students of EPFL. Our evaluations show that the system is effective in detecting bugs in students’ solutions.

Slides of the talk (muscat.pptx)2.17MiB