The tinyos of tomorrow
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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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The tinyos of tomorrow

The TinyOS of Tomorrow

Phil Levis

NEST Retreat, Jan. 2003


Tinyos progress

TinyOS Progress

  • Data link layer

  • Language support (nesC)

  • Concurrency model formalization

  • Data race detection

  • Low-power mechanisms

  • Network layer


What s to come

What’s to Come

  • Abstract components vs. parameterized interfaces

  • Incorporating concurrency model

  • Further static analysis

    • Maximum stack depth

    • Model checking


Abstract vs parameterized

Abstract vs. Parameterized

  • Abstract components

    • State replication

    • Complication: shared state

    • One-of-many

  • Parameterized interfaces

    • Compile-time binding


Incorporating concurrency

Incorporating Concurrency

  • Synchronous (task)

  • Asynchronous (interrupt)

  • Translating between the two

  • Timer: Synchronous -> Asynchronous

  • Tasks: Asynchronous -> Synchronous


Post considered harmful

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;


Abstract tasks

Abstract Tasks

abstract component SchedulerBasic() {

provides TaskBasic;

}

TaskEntry taskQueue[_INSTANCES_];

components SchedulerBasic();

TinyDB.SendTask -> SchedulerBasic;


Parameterized tasks

Parameterized Tasks

interface TaskPriority { acommand result_uncombined_t post();

event void run();

}

component SchedulerPriority {

provides TaskPriority[uint8_t priority];

}


Static analysis

Static Analysis

  • Stack depth (full program analysis)

  • Model checking (Engler et al., SOSP)

    • Implicit state transitions (MHSR)

    • Read-modify-write races (cross-component)


The mantra

The Mantra

  • HURRY UP PLEASE ITS TIME

  • SOSP 2003


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