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current->pid gets the process id accessing the module…but I want the threadid from the process in a multithreaded program accessing my module. What is the call to do this? I can’t find it anywhere!
The linux kernel does not see multithreaded processes in the same way as the POSIX thread library (which I assume is what you mean by thread id). The kernel has tasks which are somewhat separate processes looped together by the thread library. This paper from IBM gives a more detailed explanation.