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cpython/Misc
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Neil Schemenauer c98182be8d
gh-132657: Add lock-free set contains implementation (#132290) 
This roughly follows what was done for dictobject to make a lock-free
lookup operation. With this change, the set contains operation scales much
better when used from multiple-threads. The frozenset contains performance
seems unchanged (as already lock-free).

Summary of changes:

* refactor set_lookkey() into set_do_lookup() which now takes a function
  pointer that does the entry comparison. This is similar to dictobject and
  do_lookup(). In an optimized build, the comparison function is inlined and
  there should be no performance cost to this.

* change set_do_lookup() to return a status separately from the entry value

* add set_compare_frozenset() and use if the object is a frozenset. For the
  free-threaded build, this avoids some overhead (locking, atomic operations,
  incref/decref on key)

* use FT_ATOMIC_* macros as needed for atomic loads and stores

* use a deferred free on the set table array, if shared (only on free-threaded
  build, normal build always does an immediate free)

* for free-threaded build, use explicit for loop to zero the table, rather than memcpy()

* when mutating the set, assign so->table to NULL while the change is a
  happening. Assign the real table array after the change is done.
2025-12-13 09:50:23 +00:00
..
mypy gh-131507: Add support for syntax highlighting in PyREPL (GH-133247) 2025-05-02 20:22:31 +02:00
NEWS.d gh-132657: Add lock-free set contains implementation (#132290) 2025-12-13 09:50:23 +00:00
rhel7 gh-95957: Add instructions for Tcl/Tk and OpenSSL on RHEL/CentOS 7 (#95964) 2022-08-16 13:44:02 +02:00
ACKS gh-105836: Fix asyncio.run_coroutine_threadsafe leaving underlying cancelled asyncio task running (#141696) 2025-12-06 19:33:25 +00:00
externals.spdx.json gh-140849: Update bundled liblzma to 5.8.1 on Windows (#141022) 2025-11-07 22:28:01 -08:00
HISTORY gh-123492: Remove unnecessary :func: parentheses (#123493) 2024-08-30 14:34:09 +03:00
indent.pro
platform_triplet.c gh-132026: Ensure _MIPS_SIM has defined _ABI identifiers for comparison (GH-132027) 2025-04-27 21:56:00 +00:00
Porting
python-config.in bpo-45101: Add consistency in usage message IO between 2 versions of python-config (GH-28162) 2024-02-26 22:04:44 +02:00
python-config.sh.in gh-116622: Rename build variable MODULE_LDFLAGS back to LIBPYTHON (#122764) 2024-08-09 00:00:55 +02:00
python-embed.pc.in
python.man Manpage: -X gil is not related to PYTHON_HISTORY (#133753) 2025-05-09 17:11:21 +03:00
python.pc.in gh-116622: Rename build variable MODULE_LDFLAGS back to LIBPYTHON (#122764) 2024-08-09 00:00:55 +02:00
README gh-124457: Remove coverity from CPython repo (GH-124460) 2024-09-27 13:42:32 -07:00
README.AIX
README.valgrind
sbom.spdx.json gh-140120: Refresh HACL* to fix an hmac memory leak (GH-140188) 2025-10-16 05:25:51 +00:00
SpecialBuilds.txt GH-129763: Remove the LLTRACE macro (GH-129764) 2025-02-07 08:49:51 -08:00
stable_abi.toml gh-141909: Correct version where Py_mod_gil was added (GH-141979) 2025-11-26 14:45:06 +00:00
svnmap.txt
valgrind-python.supp gh-121096: Ignore dlopen() leaks in Valgrind suppression file (#121097) 2024-06-28 13:10:11 +02:00
vgrindefs

README 

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)