scope oshi_calcProcessCPUUsage.

sclass #Data {
  long startTime; // for identifying the process
  long cpuTime, timestamp;
}

// pair(pid, start time); TODO: delete dead processes from map
static Map<It, Data> #data = 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 = data.get(pid);
  if (data == null || data.startTime != p.getStartTime())
    data.put(pid, data = new Data);
  if (data.startTime == 0) data.startTime = p.getStartTime();
  
	long cpuTime = p.getKernelTime() + p.getUserTime();

  double result = 0;
  long now = sysNow();
  if (data.timestamp != 0)
		result = percentRatio(cpuTime-data.cpuTime, now-data.timestamp);
  data.timestamp = now;
	data.cpuTime = cpuTime;
	ret result;
}

end scope