About creating a thread

The createthread function is a Windows API.

It does not initialize a thread when it is created.

When some non-reentrant functions are used, the thread allocates thread-related space to save some global variables. When the thread exits, the space will not be released, resulting in Memory leakage.

 

The _ beginthreadex function is a CRT function.

Some initialization actions will be performed when the thread is created. During the return of the thread function, _ endthreadex will be automatically called to automatically release the memory.

Directly calling _ endthreadex will cause local variables in the thread function to fail to be destructed.

 

The afxbeginthread function is mainly used in the MFC program.