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by HALtheWise
482 days ago
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It looks like the TID is stored directly in the pthread struct pointed to by %fs itself, at a fixed offset which you can somewhat-hackily compile into your code. [0] In the process of investigating this, I also realized that there's a ton of other unique-per-thread pointers accessible from that structure, most notably including the value of %fs itself (which is unfortunately unobservable afaict), the address of the TCB or TLS structures, the stack guard value, etc. Since the goal is just to have a quickly-readable unique-per-thread value, any of those should work. Windows looks similar, but I haven't investigated as deeply. [0] https://github.com/andikleen/glibc/blob/b0399147730d478ae451... [1] https://github.com/andikleen/glibc/blob/b0399147730d478ae451... |
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