#import"ViewController.h"
@interfaceViewController()
/**售票员A */
@property(nonatomic,strong)NSThread*threadA;
/**售票员B */
@property(nonatomic,strong)NSThread*threadB;
/**售票员C */
@property(nonatomic,strong)NSThread*threadC;
@property(nonatomic,assign)NSIntegertotalCount;
@end
@implementationViewController
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent*)event
{
//设置中票数
self.totalCount=100;
self.threadA= [[NSThreadalloc]initWithTarget:selfselector:@selector(saleTicket)object:nil];
self.threadB= [[NSThreadalloc]initWithTarget:selfselector:@selector(saleTicket)object:nil];
self.threadC= [[NSThreadalloc]initWithTarget:selfselector:@selector(saleTicket)object:nil];
self.threadA.name=@"售票员A";
self.threadB.name=@"售票员B";
self.threadC.name=@"售票员C";
//启动线程
@synchronized(self) {
[self.threadAstart];
[self.threadBstart];
[self.threadCstart];
}
-(void)saleTicket
{
while(1) {
//锁:必须是全局唯一的
//1.注意枷锁的位置
//2.注意枷锁的前提条件,多线程共享同一块资源
//3.注意加锁是需要代价的,需要耗费性能的
//4.加锁的结果:线程同步
@synchronized(self) {
//线程1
//线程2
//线程3
NSIntegercount =self.totalCount;
if(count >0) {
for(NSIntegeri =0; i<1000000; i++) {
}
self.totalCount= count -1;
//卖出去一张票
NSLog(@"%@卖出去了一张票,还剩下%zd张票", [NSThreadcurrentThread].name,self.totalCount);
}else
{
NSLog(@"卖完了");
break;
}
