Question

所以我最近一直在使用线程，并且错误（C＃：“ Generic_Function”没有重载匹配委托System.Threading.WaitCallBack）使我有些困惑。

起初我以为必须传递一个参数，然后我才知道它很容易为空。

ThreadPool.QueueUserWorkItem(new WaitCallback(Generic_Function), null);

该函数不应再定义为：

void Generic_Function(){
 //Code here
}

但是，我遇到一个错误。我在这里丢失了一些东西，我感到困惑。我尝试阅读文档，但我想我还没有完全掌握这一点。如果有人可以解释，我将不胜感激。非常感谢！

Answer 1

根据documentation，如下定义了一个WaitCallback：

$ nvprof ./t304
==28135== NVPROF is profiling process 28135, command: ./t304
16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,
==28135== Profiling application: ./t304
==28135== Profiling result:
            Type  Time(%)      Time     Calls       Avg       Min       Max  Name
 GPU activities:   42.97%  3.2320us         2  1.6160us  1.4080us  1.8240us  [CUDA memcpy HtoD]
                   28.52%  2.1450us         1  2.1450us  2.1450us  2.1450us  [CUDA memcpy DtoH]
                   28.51%  2.1440us         1  2.1440us  2.1440us  2.1440us  wmma_ker(__half*, __half*, float*)
      API calls:   98.42%  498.63ms         3  166.21ms  5.2170us  498.61ms  cudaMalloc
                    1.06%  5.3834ms       384  14.019us     347ns  568.79us  cuDeviceGetAttribute
                    0.38%  1.9473ms         4  486.83us  250.95us  1.1810ms  cuDeviceTotalMem
                    0.10%  493.31us         4  123.33us  109.62us  140.63us  cuDeviceGetName
                    0.01%  68.566us         1  68.566us  68.566us  68.566us  cudaLaunchKernel
                    0.01%  67.104us         3  22.368us  9.6850us  30.563us  cudaMemcpy
                    0.00%  22.628us         4  5.6570us  3.1910us  9.2200us  cuDeviceGetPCIBusId
                    0.00%  8.6020us         8  1.0750us     540ns  1.6570us  cuDeviceGet
                    0.00%  5.8370us         3  1.9450us     443ns  3.7760us  cuDeviceGetCount
                    0.00%  2.7590us         4     689ns     600ns     843ns  cuDeviceGetUuid

因此，如果您希望代码可以工作，可以进行以下修改：

public delegate void WaitCallback(object state);

Answer 2

如果由于某些原因您无法更改Generic_Function签名，则可以使用lambda包装呼叫：

ThreadPool.QueueUserWorkItem(_ => Generic_Function());

C＃：“函数”的任何重载都不匹配委托System.Threading.WaitCallBack

2 个答案: