dispatch_semaphore two
ios开发GCD的dispatch_semaphore:1、常用函数及作用 2、信号量的用途:1》同步不同线程 2》当做锁来使用：3》控制同时执行的线程数：
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dispatch_semaphore
//信号量用途1：//两个资源，三个线程执行；设定信号量值为2，先执行两个线程，等执行完一个，才会继续执行下一个，保证同一时间执行的线程不超过两个，保证线程的最大并发数//信号量用途2：//创建信号量
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