php简易购物网站开发,wordpress主题添加一个自定义页面,网站开发前端框架和后端框架,网站建设网站推广服务公司当一个线程#xff0c;被设置为IsBackground true的时候#xff0c;它就会放手#xff0c;让主线程不用等#xff0c;而主线程一退出#xff0c;它就会退出。 为False时#xff0c;则是要求主线程等待其执行完毕#xff0c;它先退出#xff0c;主线程再退出。 参考官方…当一个线程被设置为IsBackground true的时候它就会放手让主线程不用等而主线程一退出它就会退出。 为False时则是要求主线程等待其执行完毕它先退出主线程再退出。 参考官方教程。 下面验证一下
两个线程均为后台线程
注意看Main()中的IsBackground 设置语句。 线程1-2运行的任务相同但是运行次数不一样。 线程2运行时间更长一些。 本次测试中两处均未被注释。
class Example
{static void Main(){Thread t1 new Thread(new ThreadStart((new BackgroundTest(10)).RunLoop));t1.IsBackground true; // 注意此处1Thread t2 new Thread(new ThreadStart((new BackgroundTest(50)).RunLoop));t2.IsBackground true; // 注意此处2t1.Start();t2.Start();}
}class BackgroundTest
{int maxIterations;public BackgroundTest(int maxIterations){this.maxIterations maxIterations;}public void RunLoop(){for (int i 0; i maxIterations; i){Console.WriteLine({0} count: {1},Thread.CurrentThread.IsBackground ?Background Thread : Foreground Thread, i);Thread.Sleep(200);}Console.WriteLine({0} finished counting.,Thread.CurrentThread.IsBackground ?Background Thread : Foreground Thread);}
}线程结束情况
程序“[29084] Demo.exe”已退出返回值为 0 (0x0)。此代码运行时控制台一闪而过无任何输出。也就是两个线程均未运行起来就随Main线程退出了。
线程12均为前台线程
代码方面将1、2两处均注释掉。 控制台输出
Foreground Thread count: 0
Foreground Thread count: 0
Foreground Thread count: 1
Foreground Thread count: 1
Foreground Thread count: 2
Foreground Thread count: 2
Foreground Thread count: 3
Foreground Thread count: 3
Foreground Thread count: 4
Foreground Thread count: 4
Foreground Thread count: 5
Foreground Thread count: 5
Foreground Thread count: 6
Foreground Thread count: 6
Foreground Thread count: 7
Foreground Thread count: 7
Foreground Thread count: 8
Foreground Thread count: 8
Foreground Thread count: 9
Foreground Thread count: 9
Foreground Thread count: 10
Foreground Thread finished counting.
Foreground Thread count: 11
Foreground Thread count: 12
Foreground Thread count: 13
Foreground Thread count: 14
Foreground Thread count: 15
Foreground Thread count: 16
Foreground Thread count: 17
Foreground Thread count: 18
Foreground Thread count: 19
Foreground Thread count: 20
Foreground Thread count: 21
Foreground Thread count: 22
Foreground Thread count: 23
Foreground Thread count: 24
Foreground Thread count: 25
Foreground Thread count: 26
Foreground Thread count: 27
Foreground Thread count: 28
Foreground Thread count: 29
Foreground Thread count: 30
Foreground Thread count: 31
Foreground Thread count: 32
Foreground Thread count: 33
Foreground Thread count: 34
Foreground Thread count: 35
Foreground Thread count: 36
Foreground Thread count: 37
Foreground Thread count: 38
Foreground Thread count: 39
Foreground Thread count: 40
Foreground Thread count: 41
Foreground Thread count: 42
Foreground Thread count: 43
Foreground Thread count: 44
Foreground Thread count: 45
Foreground Thread count: 46
Foreground Thread count: 47
Foreground Thread count: 48
Foreground Thread count: 49
Foreground Thread finished counting.线程结束情况
线程 0x761c 已退出返回值为 0 (0x0)。
线程 0x2360 已退出返回值为 0 (0x0)。
程序“[14928] Demo.exe”已退出返回值为 0 (0x0)。说明Main线程会等待前台线程直到它们结束退出Main线程再推出。
线程1为前台进程
代码方面只需要将1处t1.IsBackground true;注释掉就可以了。 控制台输出
Foreground Thread count: 0
Background Thread count: 0
Foreground Thread count: 1
Background Thread count: 1
Foreground Thread count: 2
Background Thread count: 2
Background Thread count: 3
Foreground Thread count: 3
Background Thread count: 4
Foreground Thread count: 4
Foreground Thread count: 5
Background Thread count: 5
Background Thread count: 6
Foreground Thread count: 6
Background Thread count: 7
Foreground Thread count: 7
Background Thread count: 8
Foreground Thread count: 8
Background Thread count: 9
Foreground Thread count: 9
Foreground Thread finished counting.
Background Thread count: 10线程结束情况
线程 0xccc 已退出返回值为 0 (0x0)。
程序“[33772] Demo.exe”已退出返回值为 0 (0x0)。上述为全部输出内容。这说明 前台线程会执行直到结束然后主线程退出最后当所有的前台线程一结束后台线程也立即结束。
线程2为前台进程
代码方面只需要将2处t2.IsBackground true;注释掉就可以了。 控制台输出
Foreground Thread count: 0
Background Thread count: 0
Foreground Thread count: 1
Background Thread count: 1
Background Thread count: 2
Foreground Thread count: 2
Foreground Thread count: 3
Background Thread count: 3
Background Thread count: 4
Foreground Thread count: 4
Background Thread count: 5
Foreground Thread count: 5
Foreground Thread count: 6
Background Thread count: 6
Background Thread count: 7
Foreground Thread count: 7
Foreground Thread count: 8
Background Thread count: 8
Foreground Thread count: 9
Background Thread count: 9
Background Thread finished counting.
Foreground Thread count: 10
Foreground Thread count: 11
Foreground Thread count: 12
Foreground Thread count: 13
Foreground Thread count: 14
Foreground Thread count: 15
Foreground Thread count: 16
Foreground Thread count: 17
Foreground Thread count: 18
Foreground Thread count: 19
Foreground Thread count: 20
Foreground Thread count: 21
Foreground Thread count: 22
Foreground Thread count: 23
Foreground Thread count: 24
Foreground Thread count: 25
Foreground Thread count: 26
Foreground Thread count: 27
Foreground Thread count: 28
Foreground Thread count: 29
Foreground Thread count: 30
Foreground Thread count: 31
Foreground Thread count: 32
Foreground Thread count: 33
Foreground Thread count: 34
Foreground Thread count: 35
Foreground Thread count: 36
Foreground Thread count: 37
Foreground Thread count: 38
Foreground Thread count: 39
Foreground Thread count: 40
Foreground Thread count: 41
Foreground Thread count: 42
Foreground Thread count: 43
Foreground Thread count: 44
Foreground Thread count: 45
Foreground Thread count: 46
Foreground Thread count: 47
Foreground Thread count: 48
Foreground Thread count: 49
Foreground Thread finished counting.线程结束情况
线程 0x6bb0 已退出返回值为 0 (0x0)。
线程 0x3774 已退出返回值为 0 (0x0)。
程序“[11692] Demo.exe”已退出返回值为 0 (0x0)。前台线程会执行直到结束而由于前台线程执行时间长后台线程执行时间短故而后台线程也能执行完毕。等前台线程执行结束后Main线程也结束。
