swift详解之十五------------NSThread线程同步锁

NSThread线程同步锁

上小节用NSThread实现读取网络图片 ， 这节用NSThread 模拟一个卖票的例子 。用NSLock 或者NSCondition 锁定资源

var total = 100 //总票数
    var w1 = 0  //窗口1卖出票数
    var w2 = 0   //窗口2卖出票数
    var isSell = true  //是否出售
    var lock:NSLock?   
    var condition:NSCondition?

这里首先定义一些变量

然后再点击卖票的时候，开启连个线程模仿窗口

lock = NSLock()
        condition = NSCondition()
        //setTicketValue()
        let thread1 = NSThread(target: self,selector: "run",object: nil)
        thread1.name = "thread-1"
        thread1.start()

        let thread2 = NSThread(target: self,object: nil)
        thread2.name = "thread-2"
        thread2.start()

 func run(){ while(isSell){ lock?.lock() if(total>0){ NSThread.sleepForTimeInterval(0.2); total-- if(NSThread.currentThread().name == "thread-1") { w1++ }else if(NSThread.currentThread().name == "thread-2"){ w2++ } dispatch_async(dispatch_get_main_queue()) { self.setTicketValue() } }else{ dispatch_async(dispatch_get_main_queue()) { self.totalTicks.text = "票卖完啦" self.isSell = false } } lock?.unlock() } }

大概就是这样的一个小示例 。
源码下载地址：源码

原文地址：https://www.jb51.cc/swift/326119.html