scope oshi_calcProcessCPUUsage.

sbool #debug;

sclass #Data {

  S characteristics; // for identifying the process

  long cpuTime, timestamp;

  toString { ret "cpuTime=" + cpuTime + ", timestamp=" + timestamp + ", characteristics=" + characteristics; }

}

// key: pid; TODO: delete dead processes from map

static Map<Int, Data> #map = synchroMap();

// call this in proper interval (1 to 3 seconds) to work properly

static double oshi_calcProcessCPUUsage(OSProcess p) {

  if (p == null) ret 0;

  int pid = p.getProcessID();

  Data data = map.get(pid);

  S characteristics = oshi_immutableProcessCharacteristics(p);

  if (data == null || neq(data.characteristics, characteristics)) {

    if (debug && data != null) print("Dropping data for " + pid + " (" + data.characteristics + " vs " + characteristics + ")");

    map.put(pid, data = new Data);

  }

  if (data.characteristics == null) data.characteristics = characteristics;

  long cpuTime = p.getKernelTime() + p.getUserTime();

  double result = 0;

  long now = sysNow();

  if (debug)

    print("oshi cpu: " + pid + " / " + cpuTime + " / " + data);

  if (data.timestamp != 0)

		result = percentRatio(cpuTime-data.cpuTime, now-data.timestamp);

  data.timestamp = now;

	data.cpuTime = cpuTime;

	ret result;

}

end scope