Problems of CString in multithreading

It's OK to be free , Chat CString Easy to step on in multithreading , This pit is likely to exist in your current project .

give an example ：

int main()
{
	CString str = L"test";
	CString strThread1 = str;
	CString strThread2 = str;

	// Pass the two parameters to their respective threads , The following uses pseudo code 
	CThread thread1(strThread1);
	CThread thread2(strThread2);

    thread1.wait();
    thread2.wait();
	return 0;
}

Don't assume that strThread1 and strThread2 It's just a temporary variable , It's safe to pass values into threads ,CString The interior of the is more complex , Yes Such as reference count , When writing copy This function , in other words , In this code str、strThread1 as well as strThread2 It points to the same section of memory , stay The result of operating a section of memory in multithreading can be imagined , ha-ha ！

When debugging the code, it can be proved that these three variables point to the same section of memory ：