createtimer.cpp

来自「一个很棒的网络控制系统仿真软件」· C++ 代码 · 共 72 行

#ifndef CREATE_TIMER
#define CREATE_TIMER

#include "gethandler.cpp"

bool ttCreatePeriodicTimer(char *nameOfTimer, double start, double period, char *nameOfHandler) {

  TimerNode* tn;
  Timer* t;
  
  if (strcmp(nameOfTimer,"") == 0) {
    MEX_ERROR("ttCreate(Periodic)Timer: Name should be a non-empty string!");
    return false;
  }
  if (rtsys->prioFcn == NULL) {
    printf("ttCreate(Periodic)Timer: Kernel must be initialized before creation of timers!");
    return false;
  }

  tn = (TimerNode*) rtsys->timerQ->getFirst();
  while (tn!=NULL) {
    if (tn->getTimer()->name != NULL) {
      if (strcmp(tn->getTimer()->name, nameOfTimer) == 0)
	break;
    }
    tn = (TimerNode*) tn->getNext();
  }
  if (tn != NULL) { 
    MEX_ERROR("ttCreate(Periodic)Timer: Name of timer not unique!");
    return false;
  }

  Handler* handler = getHandler(nameOfHandler); 
  if (handler == NULL) {
    // Handler does not exist 
    char buf[200];
    sprintf(buf, "ttCreate(Periodic)Timer: Non-existent interrupt handler '%s'!", nameOfHandler);
    MEX_ERROR(buf);
    return false;
  }
  if (start - rtsys->time < -EPS) {
    MEX_ERROR("ttCreate(Periodic)Timer: Can't create timer backwards in time!");
    return false;
  }

  t = new Timer;
  t->name = new char[strlen(nameOfTimer)+1];
  strcpy(t->name, nameOfTimer);
  t->time = start;
  t->period = period;
  if (period < 0.0) {
    t->isPeriodic = false;
  } else {
    t->isPeriodic = true;
  }
  t->wcetORtimer = false;
  t->dlORtimer = false;
  t->handler = handler;
  t->task = NULL;
  rtsys->timerQ->insertSorted(new TimerNode(t));
  
  return true;
}    

bool ttCreateTimer(char *nameOfTimer, double when, char *nameOfHandler) {
  
  // Creating timer with negative period will create a one-shot timer
  return ttCreatePeriodicTimer(nameOfTimer, when, -1.0, nameOfHandler);
}

#endif