How to get a thread ID?

[Václav Haisman]

Hi,
is it possible to obtain some sort of a thread ID that identifies a thread
within a process other than pthread_self()? Something like gettid() on
Linux? Apparently, on FreeBSD the pthread_t is a pointer type and does not
identify the thread well enough. GDB on FreeBSD seems to know about threads
and does not seem to use the same ID as is pthread_t.

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VH