Notification when a thread is destroyed [duplicate]

Question

Is there a way to get a notification that a thread no longer runs (has returned) in your application?
I know this is possible in kernel mode (using PsSetCreateThreadNotifyRoutine), but is there a way to know this from user mode, using only Win32 API ?

The problem is that I can't control the code in the thread, because my module is part of a library. Making a driver to monitor the system would not be too hard, but it's annoying for the users to install a driver even for a basic application that uses my library.

My code uses TLS storage, and under Linux/Unix pthread_key_create can take a pointer to a function that is called when the thread is destroyed. But TlsAlloc (Windows) has nothing like this...

Thanks in advance!

Answer 1

Depends on what kind of libraray you have. For a DLL could handle the thread termination in your DllMain (DLL_THREAD_DETACH). The MSDN states that this is the best place to deal with TLS Resources.

Keep in mind that this callback is only calld for a thread exiting cleanly (not by e.g TerminateThread()).

Answer 2

Similar functionality is available with Fibers. From MSDN:

FlsAlloc, FlsCallback, FlsFree

FlsCallback Callback Function

An application-defined function. If the FLS slot is in use, FlsCallback is called on fiber deletion, thread exit, and when an FLS index is freed.