import CPUFreq

// in practice, core IDs could be discovered dynamically using other means...
let bindings: [CPUFreq] = [ CPUFreq(cpu: 0), CPUFreq(cpu: 1) ]

// populate "availableFreqs" array
let availableFreqs: [UInt32] = bindings[0].getScalingAvailableFrequencies()!
// won't use that file again, so we can manually close it to free up resources
bindings[0].closeFile(file: CPUFreqFile.scalingAvailableFrequencies)

// set "userspace" governor on all cores
for cpu in bindings {
    let _ = cpu.setScalingGovernor(governor: "userspace")
    // again, close the file manually to free up resources
    cpu.closeFile(file: CPUFreqFile.scalingGovernor)
}

// do application work, breaking from loop when finished...
while (true) {
    // in practice, a new frequency would be determined dynamically by some scheduling logic...
    let freq = availableFreqs[0];
    for cpu in bindings {
        let _ = cpu.setScalingSetspeed(freq: freq);
    }
}

// once bindings go out of scope, any open files (e.g. CPUFreqFile.scalingSetspeed) are closed automatically