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#import "ViewController.h"
#import <pthread.h>
@implementation ViewController
static NSUInteger ticketCount_ = 20;
- (void)viewDidLoad
{
    [super viewDidLoad];
    dispatch_queue_t queue = dispatch_queue_create("com.yusian.custom-queue", DISPATCH_QUEUE_SERIAL);
    for (int i = 0; i < 5; i++) {
        dispatch_async(queue, ^{
            [self saleTicket];
        });
    }
}
- (void)saleTicket
{
    NSUInteger remain = ticketCount_;
    sleep(1);
    ticketCount_ = --remain;
    NSLog(@"%ld, %@", ticketCount_, [NSThread currentThread]);
}
@end

#import "ViewController.h" #import <pthread.h> @implementation ViewController static NSUInteger ticketCount_ = 20; - (void)viewDidLoad { [super viewDidLoad]; dispatch_queue_t queue = dispatch_queue_create("com.yusian.custom-queue", DISPATCH_QUEUE_SERIAL); for (int i = 0; i < 5; i++) { dispatch_async(queue, ^{ [self saleTicket]; }); } } - (void)saleTicket { NSUInteger remain = ticketCount_; sleep(1); ticketCount_ = --remain; NSLog(@"%ld, %@", ticketCount_, [NSThread currentThread]); } @end