Date: Wed, 03 Feb 2021 08:16:30 +0100 From: Florian Weimer <fweimer@...hat.com> To: Dominic Chen <d.c.ddcc@...il.com> Cc: musl@...ts.openwall.com Subject: Re: Incorrect thread TID caching * Dominic Chen: > From a quick skim of other libc implementations, both bionic and glibc > don't seem to cache TID, and directly call the gettid system call > inside raise(). Of course glibc has a TID cache. It doesn't use it in raise (mostly to get abort working after vfork), but it's definitely needed in other places. If you use the clone system call wrapper in threading (not fork/vfork) mode, you cannot call any libc functions afterwards, including the syscall function. Instead, you have to issue direct system calls. Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill
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