clockcontextm.nc

来自「tinyos最新版」· NC 代码 · 共 155 行

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/*
 * Authors:   Neil Patel
 * History:   Apr 11, 2003         Inception.
 *
 */

/**
 * @author Neil Patel
 */


includes AM;
includes Mate;

module ClockContextM {
  provides {
    interface StdControl;
  }
  
  uses {
    interface StdControl as SubControlTimer;
    interface Timer as ClockTimer;      
    interface MateContextSynch as Synch;
    interface MateEngineControl as EngineControl;
    interface MateCapsuleStore as CapsuleStore;
    interface MateAnalysis as Analysis;
  }
}


implementation {
  MateContext clockContext;
  
  command result_t StdControl.init() {
    result_t rval;
    rval = call SubControlTimer.init();
    clockContext.which = MATE_CONTEXT_CLOCK;
    clockContext.state = MATE_STATE_HALT;

    rval &= call CapsuleStore.initializeCapsule();
    clockContext.rootCapsule = call CapsuleStore.getCapsule();
    clockContext.currentCapsule = clockContext.rootCapsule;

    call Analysis.analyzeCapsuleVars(clockContext.rootCapsule);
    call EngineControl.registerCapsule(clockContext.rootCapsule);

    return rval;
  }

  command result_t StdControl.start() {
    call SubControlTimer.start();
    call ClockTimer.start(TIMER_REPEAT, 1024);
    return SUCCESS;
  }

  command result_t StdControl.stop() {
    call SubControlTimer.stop();
    call ClockTimer.stop();
    return SUCCESS;
  }

  task void ClockEventTask() {
    if (clockContext.state == MATE_STATE_HALT) {
      call Synch.initializeContext(&clockContext);
      call Synch.resumeContext(&clockContext, &clockContext);
    }
    else {
      dbg(DBG_USR1, "VM: Clock context not halted. Currently in state %i.\n", clockContext.state);
      // Can log a clock miss error here, but probably
      // not a good idea
    }
  }
  
  event result_t ClockTimer.fired() {
    dbg(DBG_USR1, "VM: clock timer fired, posting ClockEventTask.\n");
    post ClockEventTask();
    return SUCCESS;
  }

  event result_t Synch.makeRunnable(MateContext* context) {
    return SUCCESS;
  }

  event void CapsuleStore.capsuleChanged(MateCapsuleBuffer* buf) {
    clockContext.rootCapsule = buf;
    clockContext.currentCapsule = clockContext.rootCapsule;
    call Synch.initializeContext(&clockContext);
  }
}