[笔记] 关于 NSThread

这回的作业需要一直根据x,y,z三个方向的加速度维护一个变量，另外有个线程每隔一秒访问一次这个变量，根据变量的值判断输出音乐的频率。于是就先写了下面这么个程序练手。

下面这个东西干了这么个事情：分出两个Thread，都执行对value值+1，并打印的操作。
吐槽：笔者写似乎是个线程不安全的典型，请勿参考。

//
//  ViewController.m
//  MTTest
//
//  Created by 鲁辰 on 7/29/15.
//  Copyright (c) 2015 ChenLu. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, assign) NSUInteger value;

@end

@implementation ViewController
@synthesize value;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //NSThread
    [NSThread detachNewThreadSelector:@selector(run) toTarget:self withObject:nil];
    
    NSThread* myThread = [[NSThread alloc] initWithTarget:self
                                                   selector:@selector(run)
                                                     object:nil];
    [myThread start];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)run {
    while (YES) {
        @synchronized(self) {
            value++;
        }
        NSThread *current = [NSThread currentThread];
        NSLog(@"Value: %lu, Thread: %@", (unsigned long)value, current);
        sleep(1);
    }
}

@end

代码链接：https://gist.github.com/1992chenlu/41b3adfb10d01ac36dda

Reference:
http://www.raywenderlich.com/60749/grand-central-dispatch-in-depth-part-1（这一篇很好，有时间应该细读）
http://www.cnblogs.com/likwo/archive/2011/11/01/2232309.html
http://sodecon.blogspot.com/2012/08/ios-multithreading-thread-safety-in-ios.html
http://www.libaocai.com/network/ios/2014/12/30/608

http://blog.csdn.net/zhangao0086/article/details/38904923（这篇关于GCD，还没搞明白T_T）