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CPython's pthread-based thread identifier relies on pthread_t being able to be represented as an unsigned integer type. This is true in most Linux libc implementations where it's defined as an unsigned long, however musl typedefs it as a struct *. If the pointer has the high bit set and is cast to PyThread_ident_t, the resultant value can be sign-extended [0]. This can cause issues when comparing against threading._MainThread's identifier. The main thread's identifier value is retrieved via _get_main_thread_ident which is backed by an unsigned long which truncates sign extended bits. >>> hex(threading.main_thread().ident) '0xb6f33f3c' >>> hex(threading.current_thread().ident) '0xffffffffb6f33f3c' Work around this by conditionally compiling in some code for non-glibc based Linux platforms that are at risk of sign-extension to return a PyLong based on the main thread's unsigned long thread identifier if the current thread is the main thread. [0]: https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Arrays-and-pointers-implementation.html --------- Signed-off-by: Vincent Fazio <vfazio@gmail.com> |
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| mypy | ||
| NEWS.d | ||
| rhel7 | ||
| ACKS | ||
| externals.spdx.json | ||
| HISTORY | ||
| indent.pro | ||
| platform_triplet.c | ||
| Porting | ||
| python-config.in | ||
| python-config.sh.in | ||
| python-embed.pc.in | ||
| python.man | ||
| python.pc.in | ||
| README | ||
| README.AIX | ||
| README.valgrind | ||
| sbom.spdx.json | ||
| SpecialBuilds.txt | ||
| stable_abi.toml | ||
| svnmap.txt | ||
| valgrind-python.supp | ||
| vgrindefs | ||
Python Misc subdirectory
========================
This directory contains files that wouldn't fit in elsewhere. Some
documents are only of historic importance.
Files found here
----------------
ACKS Acknowledgements
HISTORY News from previous releases -- oldest last
indent.pro GNU indent profile approximating my C style
NEWS News for this release (for some meaning of "this")
Porting Mini-FAQ on porting to new platforms
python-config.in Python script template for python-config
python.man UNIX man page for the python interpreter
python.pc.in Package configuration info template for pkg-config
README The file you're reading now
README.AIX Information about using Python on AIX
README.valgrind Information for Valgrind users, see valgrind-python.supp
SpecialBuilds.txt Describes extra symbols you can set for debug builds
svnmap.txt Map of old SVN revs and branches to hg changeset ids,
help history-digging
valgrind-python.supp Valgrind suppression file, see README.valgrind
vgrindefs Python configuration for vgrind (a generic pretty printer)