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The TinyOS of Tomorrow

The TinyOS of Tomorrow. Phil Levis NEST Retreat, Jan. 2003. TinyOS Progress. Data link layer Language support (nesC) Concurrency model formalization Data race detection Low-power mechanisms Network layer. What’s to Come. Abstract components vs. parameterized interfaces

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The TinyOS of Tomorrow

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  1. The TinyOS of Tomorrow Phil Levis NEST Retreat, Jan. 2003

  2. TinyOS Progress • Data link layer • Language support (nesC) • Concurrency model formalization • Data race detection • Low-power mechanisms • Network layer

  3. What’s to Come • Abstract components vs. parameterized interfaces • Incorporating concurrency model • Further static analysis • Maximum stack depth • Model checking

  4. Abstract vs. Parameterized • Abstract components • State replication • Complication: shared state • One-of-many • Parameterized interfaces • Compile-time binding

  5. Incorporating Concurrency • Synchronous (task) • Asynchronous (interrupt) • Translating between the two • Timer: Synchronous -> Asynchronous • Tasks: Asynchronous -> Synchronous

  6. Post Considered Harmful • Deprecated by concurrency qualifiers • Abstract components (linkage analysis) • Task queue length • Scheduler component interface TaskBasic { acommand result_t post(); event void run(); } uses TaskBasic as SendTask;

  7. Abstract Tasks abstract component SchedulerBasic() { provides TaskBasic; } … TaskEntry taskQueue[_INSTANCES_]; … components SchedulerBasic(); … TinyDB.SendTask -> SchedulerBasic; …

  8. Parameterized Tasks interface TaskPriority { acommand result_uncombined_t post(); event void run(); } component SchedulerPriority { provides TaskPriority[uint8_t priority]; }

  9. Static Analysis • Stack depth (full program analysis) • Model checking (Engler et al., SOSP) • Implicit state transitions (MHSR) • Read-modify-write races (cross-component)

  10. The Mantra • HURRY UP PLEASE ITS TIME • SOSP 2003

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