标签：res math OLE 不可 false ons data color setevent
如下的代码，最后的cnt 居然不为0？
哪里的bug？
t2跑的太快了。
AutoResetEvent m = new AutoResetEvent(false); int i = 0; int[] data = new int[0x100000]; Task t1 = Task.Run(() => { Console.WriteLine("t1 run"); while (i < 0x0fffff) { ++i; m.WaitOne(); } Console.WriteLine("t1 done"); }); Task t2 = Task.Run(() => { Console.WriteLine("t2 run"); while (i < 0x0fffff) { data[i] = i; m.Set(); } Console.WriteLine("t2 done"); }); Task.WaitAll(t1,t2); int cnt = 0; int min = 0x0fffff; for (int j = 0; j < 0x0fffff; ++j) { if (data[j] != j) { min = Math.Min(min, j); cnt++; } } Console.WriteLine(cnt *1.0 / 0x0fffff);
再来一个AutoResetEvent就好了。
AutoResetEvent m1 = new AutoResetEvent(true); AutoResetEvent m2 = new AutoResetEvent(false); int i = 0; int[] data = new int[0x100000]; Task t1 = Task.Run(() => { Console.WriteLine("t1 run"); while (i < 0x0fffff) { m1.WaitOne(); ++i; m2.Set(); } Console.WriteLine("t1 done"); }); Task t2 = Task.Run(() => { Console.WriteLine("t2 run"); while (i < 0x0fffff) { m2.WaitOne(); data[i] = i; m1.Set(); } Console.WriteLine("t2 done"); }); Task.WaitAll(t1,t2); int cnt = 0; int min = 0x0fffff; for (int j = 0; j < 0x0fffff; ++j) { if (data[j] != j) { min = Math.Min(min, j); cnt++; } } Console.WriteLine(cnt *1.0 / 0x0fffff);
case1的修改版：结果任然不为0，奇怪怪
AutoResetEvent m1 = new AutoResetEvent(false); int i = 0; int[] data = new int[0x100000]; Task t1 = Task.Run(() => { Console.WriteLine("t1 run"); while (i < 0x0fffff) { m1.WaitOne(); ++i; } Console.WriteLine("t1 done"); }); Task t2 = Task.Run(() => { Console.WriteLine("t2 run"); while (i < 0x0fffff) { data[i] = i; m1.Set(); } Console.WriteLine("t2 done"); }); Task.WaitAll(t1, t2); int cnt = 0; int min = 0x0fffff; for (int j = 0; j < 0x0fffff; ++j) { if (data[j] != j) { min = Math.Min(min, j); cnt++; Console.WriteLine($"data[{j}]: {data[j]}"); } } Console.WriteLine($"min: {min}, count: {cnt}, {cnt * 1.0 / 0x0fffff}");
第四版：到底什么++i, 什么是i++？
AutoResetEvent m1 = new AutoResetEvent(false); int[] data = new int[0x100000]; Task t1 = Task.Run(() => { Console.WriteLine("t1 run"); while (i < 0x0fffff) { m1.WaitOne(); i++; } Console.WriteLine("t1 done"); }); Task t2 = Task.Run(() => { Console.WriteLine("t2 run"); while (i < 0x0fffff) { data[i] = i; m1.Set(); } Console.WriteLine("t2 done"); }); Task.WaitAll(t1, t2); int cnt = 0; int min = 0x0fffff; for (int j = 0; j < 0x0fffff; ++j) { if (data[j] != j) { min = Math.Min(min, j); cnt++; Console.WriteLine($"data[{j}]: {data[j]}"); } } Console.WriteLine($"min: {min}, count: {cnt}, {cnt * 1.0 / 0x0fffff}");
标签：res math OLE 不可 false ons data color setevent
原文地址：https://www.cnblogs.com/crazyghostvon/p/AutoResetEvent.html
