import Cocoa
let app = NSApplication.shared
app.setActivationPolicy(.regular)
let window = NSWindow(contentRect:NSRect(x:0,y:0,width:540,height:250),styleMask:[.titled,.closable,.miniaturizable],backing:.buffered,defer:false)
window.title = "AppHalt measurement fixture"
let label = NSTextField(wrappingLabelWithString:"Controlled synthetic workload\n\nOne background worker: 25 ms busy, 75 ms sleeping.\nNo documents, accounts, network or personal data.\n\nUse AppHalt to pause and resume this test app.")
label.frame=NSRect(x:25,y:45,width:490,height:180)
label.font=NSFont.systemFont(ofSize:17)
window.contentView?.addSubview(label)
window.center(); window.makeKeyAndOrderFront(nil)
DispatchQueue.global(qos:.utility).async {
 while true {
  let end=DispatchTime.now().uptimeNanoseconds+25_000_000
  while DispatchTime.now().uptimeNanoseconds < end {}
  Thread.sleep(forTimeInterval:0.075)
 }
}
app.run()