windows 我必须在线程句柄上 CloseHandle() 吗？
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Must I CloseHandle() on a thread handle?
提问by valdo
_beginthreadex returns a handle to a thread:
_beginthreadex 返回线程的句柄：
m_hStreamStatsThread = (HANDLE) _beginthreadex( NULL, 0, StreamStatsThread, this, 0, NULL );
This handle may be used if you need to refer to the thread in calls like TerminateThread(..) for example.
例如，如果您需要在诸如 TerminateThread(..) 之类的调用中引用线程，则可以使用此句柄。
According to the MSDN page on _beginthreadex, _beginthreadex won't always return a valid handle - e.g. it may also return -1L on error etc.
根据_beginthreadex上的 MSDN 页面，_beginthreadex 不会总是返回有效的句柄 - 例如，它也可能在错误等时返回 -1L。
When a thread has completed normally, do I have to call CloseHandle on the thread handle, or can I just set its value to NULL / INVALID_HANDLE_VALUE?
当线程正常完成时，我是否必须在线程句柄上调用 CloseHandle，或者我可以将其值设置为 NULL / INVALID_HANDLE_VALUE？
回答by valdo
Agree with Nemanja Trifunovic.
同意 Nemanja Trifunovic 的观点。
Even after the thread exited - its handle is valid. You can for instance query its return value.
即使在线程退出之后 - 它的句柄也是有效的。例如，您可以查询其返回值。
As a general rule: every Win32 handle must be closed by CloseHandle, unless otherwise specified.
作为一般规则：CloseHandle除非另有说明，否则每个 Win32 句柄都必须由 关闭。
回答by Nemanja Trifunovic
The code sample on the MSDN page you posted a link to includes a call to CloseHandle(). Setting the handle's value to NULL does not decrease the kernel object's internal ref count and is pretty much useless anyway.
您发布链接的 MSDN 页面上的代码示例包括对CloseHandle(). 将句柄的值设置为 NULL 不会减少内核对象的内部引用计数，而且几乎没有用。
