Add pthread_gettid_np for Android and glibc - #5359
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Some changes occurred in an Android module cc @maurer |
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cc: @tgross35 |
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Aug 3, 2026
Returns the Linux TID for a given thread, unlike gettid, which only returns the id of the calling thread. This is useful for std in the thread spawn path: the parent can set the TID of the child it just created, whereas today the TID can only be read once the child itself starts running. The declaration is limited to Android and linux-gnu. musl and ohos do not re-export it. ctest is gated on the glibc version. The function was added in 2.42, so older glibc has no declaration to check against. Link: https://github.com/bminor/glibc/blob/d2097651cc57834dbfcaa102ddfacae0d86cfb66/sysdeps/nptl/pthread.h#L1320-L1322 Link: https://android.googlesource.com/platform/bionic/+/731631f300090436d7f5df80d50b6275c8c60a93/libc/include/pthread.h#173
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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Link: https://github.com/bminor/glibc/blob/d2097651cc57834dbfcaa102ddfacae0d86cfb66/sysdeps/nptl/pthread.h#L1320-L1322
Link: https://android.googlesource.com/platform/bionic/+/731631f300090436d7f5df80d50b6275c8c60a93/libc/include/pthread.h#173
Description
Returns the Linux TID for a given thread, unlike
gettid, which only returns the id of the calling thread.This is useful for std in the thread spawn path: the parent can set the TID of the child it just created, whereas today the TID can only be read once the child itself starts running.
This came up while working on rust-lang/rust#160219, which fills the TID when the child starts running and explains what's missing to fill it from the parent right after creation.
libc already carries a by-handle TID query for Apple
pthread_gettid_np was added in glibc 2.42+; on Android it has been available since API level 21.
Checklist
libc-test/semverhave been updated*LASTor*MAXhave the standarddoc comment - not applicable
cargo test -p libc-test --target mytarget);especially relevant for platforms that may not be checked in CI
@rustbot label +stable-nominated