swift-thread-execution-state-properties.swift

var executing: Bool { get } // true if the receiver is executing, otherwise false.
var finished: Bool { get } //true if the receiver has finished execution, otherwise false.
var cancelled: Bool { get } //true if the receiver has been cancelled, otherwise false.


var objDS= DeviceStatus()
let thread: NSThread = NSThread(target: objDS, selector: "checkDeviceStatus", object: nil)

if thread.executing{
    println("executing")
}

if thread.finished{
    println("finished")
}

if thread.cancelled{
    println("cancelled")
}