Hello,
If you are targeting Windows, there is a special area in the PE
structure for a DLL that contains addresses that will be jumped to
whenever a thread gets created/destroyed. This has been used by
libtcmalloc from gperftools:
https://github.com/gperftools/gperftools/blob/master/src/windows/port.cc
I don't know how to populate the appropriate locations in the PE header
with freepascal though.
The comments in that same file hint that there is a function called
pthread_key_create for systems that implement the pthread library, but I
have not looked into that.
If you want an entirely FPC based solution, I would patch the running
exe so that the system thread routine that calls OnTerminate jumps to my
override which calls the original one before doing any finalization work
that it needs to do.
But installing such a trampoline is very platform specific, I only know
how to do it on Intel based architectures.
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